text:
User talk:Hillgentleman/20080903

__NOINDEX__
 * from User talk:Hillgentleman: 18:46, 3 September 2008 (UTC)

Sorting?
Hi Hillgentleman - I like the templates you are creating lately. Do you think you can make something that can sort an array of numbers, sort of like what the square root template does? --HappyCamper 22:35, 26 May 2007 (UTC)

We are experimenting with Threaded discussion here. Please leave your message with the "reply" link above. It is more interesting than to edit this page directly.

Re:
"One is happier if he can reduce, condense, summarise, catalogue, squeeze, etc, whatever he knows not, into as small and as narrow a piece as possible. He even achieve some understanding in the process"

Where is that from?--Rayc 04:00, 10 June 2007 (UTC)

You've lost me
Interesting work... and a lot of it... but... You've lost me! ;) -- CQ 03:58, 11 June 2007 (UTC)

Block?
Hi Hillgentleman, do you really want to be blocked from editing? You can always just leave en:WV alone until you feel like it, or until you have more time. ;-) Thanks for all your work of late... Cormaggio talk 11:31, 11 June 2007 (UTC)

 * Ok, so do I take it from your recent comments that you're happy to remain as you are? (Btw, I can't figure out the commenting system - I tried to reply to one post and ended up replying to another.) Thanks for the explanation on the subst issue - I can get that. :-) Cormaggio talk 15:50, 18 June 2007 (UTC)

 * Ok, so I'm blocking your account now - just give me an email when you want it unblocked... Cormaggio talk 11:52, 20 June 2007 (UTC)

Thread Navigation
It could be done, but, I think it would be noticeably slow. Perhaps a modification of the tabbed navigation used at English Wikibooks would be more suited for this task. --darklama 22:11, 10 September 2007 (UTC)
 * Sorry; I cannot see how one can manage discussion threads with these tabs.Hillgentleman|Talk 05:24, 13 September 2007 (UTC)

Editing of "Wikiversity: Consensus" page to make a "Wikiversity: Consensus" Policy underway
Thank you for your Comment at the "Wikiversity:Consensus" discussion page. Your servant should let you know that edits to the "Wikiversity: Consensus" page are underway to make a Wikiversity Consensus Policy. -- Dionysios  (talk), a Participant in the Wikiversity School of Advanced General Studies, Date: 2007-09-13 (September 13, 2007) Time:  2007 UTC

nsfv?
not suitable for wikiversity? --Remi 04:52, 23 November 2007 (UTC)

Trees
Thanks for your comment about the main page. Can you set up an example on a test sub-page? With the schools and portals already in it? ;-) --McCormack 17:00, 2 January 2008 (UTC)
 * Thanks for your message. Actually I was hoping more for a volunteer to implement a draft for the main page ;-) Any chance? --McCormack 17:53, 2 January 2008 (UTC)
 * I am not sure what you are saying. If you want to implement a draft, why couldn't you just start a discussion on the colloquium (or if you have already done so) and then change the main page? Hillgentleman|Talk 19:03, 2 January 2008 (UTC)
 * P.S. In some other contexts you may also be interested in meta:user:pathoschild's Ajax "transclusion" tool. Materials are not exactly transcluded, but only presented as links, which could be expanded into full texts once you click on them.  It is very efficient in some cases, and it has been implemented on meta. Hillgentleman|Talk 19:08, 2 January 2008 (UTC)
 * At the moment I'm not too keen myself on putting complicated scripts onto the main page. I'm more interested in getting the content sorted out, especially for newcomers. Eye-candy can come later. --McCormack 16:04, 5 January 2008 (UTC)
 * Sure.Hillgentleman|Talk 20:05, 5 January 2008 (UTC)

Ultra-main page on meta at www.wikiversity.org
Hi again, Hillgentleman. I'm now looking at editing main page for all the WV projects on meta. However to access the page I need the help of a meta-admin (it's protected). JWS said you could help. Perhaps we can work out a time to make changes together? It's very likely my edits will screw up for a while, so I should have a meta-admin nearby to help if I can't undo things. --McCormack 16:04, 5 January 2008 (UTC)
 * Sure. I am not familiar with the html but you can give me the code. (Or perhaps we can briefly unprotect the page.  We can even cascade-protect it with a future timestamp; after you have finished, you can turn on the protection yourself by visiting the transcluding page.) Hillgentleman|Talk 20:05, 5 January 2008 (UTC)
 * Hi. Are you active right now? Can we meet on IRC to coordinate things? I'm on IRC right now. Thanks! --McCormack 07:19, 6 January 2008 (UTC)
 * (A bit later) - I now have the new code ready. How can I give you the code - it's real HTML, not wiki markup. --McCormack 07:32, 6 January 2008 (UTC)
 * OK - I threw the code onto the meta page which you suggested to me. It's a real mess to look at, because the normal wiki parser doesn't cope with it, but the source is there! --McCormack 12:18, 6 January 2008 (UTC)

another check (in case you have IE)
While you are doing this, could you also check if you experience this ? Erkan Yilmaz ( Wikiversity:Chat, wiki blog ) 12:04, 6 January 2008 (UTC)
 * Hi, Erkan. I am using firefox on an Mac OS X 10.3.9 and I don't see the clogged-up menu. Hillgentleman|Talk 21:50, 6 January 2008 (UTC)
 * I have changed it; please tell me if it is bad. Hillgentleman|Talk 21:50, 6 January 2008 (UTC)

 * It looks ok in: Safari: 3.0.4 (523.13), Opera: 9.25 (build 8827), IE 7.0.6001.17119
 * but in Firefox: 2.0.0.11 (see pic) the description text "destroys" the symmetric form :-(
 * screen resolution: 1152x864
 * But when there come more separate language projects I guess this needs a change again :-) The prob with tab-layout still exists Erkan Yilmaz ( Wikiversity:Chat, wiki blog ) 21:59, 6 January 2008 (UTC)
 * Firefox - Still the icon on the top-left does counterweigh the Wikiversidad :).Hillgentleman|Talk 00:11, 7 January 2008 (UTC)

Repetitiousness of "Wikiversity"
Hi, Hillgentleman. You said: ''The word "wikiversity" appears thrice on the portal. Whilst simplicity is good, I suggest (just suggest, it is not a preference) that the title can be "Wikiversity projects" or "The Wikiversity project" (meaning that wikiversity is one project in many languages), which describes the stuff under itself.'' I agree entirely that it is repetitious. My changes were minimal - just to get rid of that confusing beta thing and clarify the purpose of the multilingual hub. However a greater redesign would involve: I think this is where we should go. What do others think? Be different? Be consistent?
 * Get rid of the icon and search box on the left
 * Move the search facility below the circle of links
 * Remove "Wikiversity" from the portico icon
 * Put a large title above the circle of links
 * Remove the wiki tabs altogether
 * Generally make the design like www.wikibooks.org or www.wikipedia.org, which is what people expect when they first find a wikimedia project.
 * --McCormack 05:24, 7 January 2008 (UTC)
 * The current wikiversity portal looks like another wikipage and I actually like that. On the other hand, the Wikibooks portal looks like a portal and is perhaps more welcoming, but one needs to scroll to find the search bar.  It would be great if we can fit the whole thing in one page like google.  Hillgentleman|Talk 17:14, 7 January 2008 (UTC)

Sandbox Server
Hello,

I apologise for all the delays with the Sandbox Server project. I've now had a few updates made to the file manager, so you can finally delete files once uploaded (and cleanly overwrite existing ones during upload)!

Anyway, we actually have a Jabber server running which we use for quite decent discussions, chat rooms etc. Drop me a line at draicone at gmail dot com and I'll hook you up with an account. It's much more powerful than IRC and far more convenient too. We've also got a Quicktime (/Darwin) Streaming Media Server setup, although we don't have much to put on there at present.

There is the wiki, but it's a bit of a lost project at the moment, due in part to my slackness and some security restrictions that seem to prevent us from doing anything whatsoever (plus the fact that we already have a fully-functioning wiki).

Also, I'm working on a change-password facility at present. There should be a link up on the main page soon enough. In the meantime, email me your current password and your new password at draicone at gmail dot com and I'll make the change manually.

Draicone (talk) 11:34, 18 January 2008 (UTC)
 * Many Thanks.Hillgentleman|Talk 05:46, 24 January 2008 (UTC)

Random mascot welcome
 Hi! My name is WikiversityJack. I am a pumpkin and a Wikiversity mascot. My aunt told me that fun + learning = Wikiversity. Let me know if I can help you out.

Help needed with substitutions and parser functions
Hi, Hillgentleman. If you have some time, can you take a look at Template:multibox (use described at Help:project boxes? I'm having some difficulty ensuring that the optional bits don't appear in the final page when subst is used. --McCormack 08:35, 8 May 2008 (UTC)
 * I think you should put subst: (or SUBST: - it is case insensitive) in front of every parser, function and template. They all work in the same way.Hillgentleman|Talk 10:18, 8 May 2008 (UTC)
 * Many thanks! Yes - I checked the code and tested it as well. Works like a dream now. --McCormack 10:53, 8 May 2008 (UTC)

Math
$$\eta^2$$ and $$\eta^2_p$$

Question: Can you even up the etas in the line above? I've asked about this here: Sizing symbols with subscripts, but thought maybe you'd know. -- Jtneill - Talk 05:50, 26 May 2008 (UTC)

 * Sorry, I don't know; I can only suggest trial and error. For Mediawiki, TeX texts are (usually?) simply images, and (at the moment?) it seems to handle "big" and "small" TeX texts differently.  Hillgentleman|Talk 14:43, 28 May 2008 (UTC)

 * One solution, per above, is to add an empty subscript:

$$\eta^2_{}$$ and $$\eta^2_p$$ Hillgentleman|Talk 14:46, 28 May 2008 (UTC)

Quick Question -- Date vs. Current date
I am still not very familiar with templates. I tried some features but when I created a template with a date, the final result always showed the current date, not the date that the OGG file was uploaded. How do I use a DATE in a template to get the date when the template was used, not the current date? Robert Elliott 09:59, 6 June 2008 (UTC)
 * You need to substitute it: e.g. gives 20080606164131; whereas  gives . Hillgentleman|Talk 16:41, 6 June 2008 (UTC)

 * In a template?
 * But in a template, if I use, it does the substitution when I save the template --  before I can use the template. How do I get  inside the template?  I have tried :

 * but none of them seem to work when I use a template with these inside.
 * but none of them seem to work when I use a template with these inside.
 * but none of them seem to work when I use a template with these inside.
 * but none of them seem to work when I use a template with these inside.
 * but none of them seem to work when I use a template with these inside.

 * There is no example of using subst inside a template in Generating dynamic content with MediaWiki.
 * The instructions are not clear.
 * Using the search function, I cannot find any template at Wikiversity which uses current time stamp.

 * Any suggestions? Robert Elliott 12:16, 8 June 2008 (UTC)

I was told that the correct way is   Robert Elliott 14:17, 8 June 2008 (UTC)
 * I found the answer!

 * For further detail, see meta:help:Substitution and meta:help:templates.Hillgentleman|Talk 03:16, 9 June 2008 (UTC)

Red links on main page?
Hi, Hillgentleman. I'm glad you're watching the Picture of the Day! You've taken to adding red-links to the POTD recently. I understand you hope that people will start resources associated with each POTD, but are you sure it really makes a good impression on people if the main page has red links on it? What do you think? --McCormack 07:01, 25 June 2008 (UTC)
 * Let's see...  It depends on what we want to achieve with the box... Of course, my hope is to stimulate content creation.  Old wikipmedians who know what red links are are not worried about them.  New wikiversitians may think that a red link means what she usually thinks it is...  However, as the main page is basically a portal, it seems to make sense if we wikified it by creating links into wikiversity contents - even if the contemts are still to be started;  From this point of view it would be more productive, and also less confusing than having a box that links mostly to Commons :).   Hillgentleman|Talk 08:03, 25 June 2008 (UTC)

huh
Sort of a silly name, but I though it might be useful for the "case studies" and such. --SB_Johnny talk 11:54, 9 August 2008 (UTC)

style
In my opinion, asking for a reference at the end of a paragraph is asking for a reference to all the claims in that paragraph. Doing it as you did, if done at Wikipedia, would be to me, clearly an attempt to make a point rather than to be simply constructive. Perhaps things are different at WikiVersity. WAS 4.250 03:15, 10 August 2008 (UTC)

 * Hello. First of all, I have not participated in the English wikipedia for a long time.  Secondly, you are entitled to your own opinion, and I have explained what I want in the edit summary.  If you know me, you would know that I say exactly what I mean, no more and no less. When I ask for citation at a point, I mean citation at that point.  In the end, I do not think stylistic issues should trump utility on wikiversity;  I prefer my way (which is how people provide citations on scientific papers) but your way is ok.  I usually don't like people changing "my" questions, but feel free to change it if the consensus amongst the participants is to use your way.  Hillgentleman|Talk 03:30, 10 August 2008 (UTC)

 * I looked for some background for all this and found http://en.wikipedia.org/w/index.php?title=Wikipedia:Administrators%27_noticeboard/Incidents&diff=prev&oldid=217491584#Astrotheology WAS 4.250 13:45, 10 August 2008 (UTC)

 * Thank you. But there is much material there and I have failed to locate the specific material to support these assertions we are concerned with. Hillgentleman|Talk 09:38, 11 August 2008 (UTC)

(<---)Wikipedia admins have been known to put comments, in the flavors derogatory to libel, on a user's page. [Examples of derogatory would include every comment warning a user; examples of libel might include mistaken such warnings to people using their real name - telling people they are non-notable or that they are lying or inappropriately promoting themselves are often done with emotionally abusive phrases such as "vanity" and officious stern templates that suggest to hapless newbies that some 13 year old is a paid official making an official judgement.] Such admins seem well aware of BLP issues, but they violate the principles. [The same ones that mistakenly place warning templates on user talk pages of users using their real names also sometimes place warnings about violating the BLP policy.] Even when asked several times to remove such comments -- they sometimes refuse or ignore the requests. [Such cases have been argued about at WP:AN/I.] There is a suggestion to make such non-article space not indexable by Google.[NewYorkBrad is argueing that right now on the Foundation or Wikipedia public mail list.] WAS 4.250 13:27, 11 August 2008 (UTC)

I am unclear as to the usefulness of discussing this on this project, but the above has been discussed enough at Wikipedia Review that I believe the above is what he is talking about. Increasing ethical awareness among admins might help with all this. WAS 4.250 13:59, 11 August 2008 (UTC)

Request for clarification
I have respond to your message on the talk page. I have also added details in a background section to further clarify. If you require further explanations please don't hesitate to contact me and I will try to elaborate further. I hope to see you participate in what is, IMHO, an important learning project for the community.

One question for yourself, do you think it would be inappropriate to include a minimum number of participants in the project before we begin? Donek (talk) - Go raibh mile maith agaibh 16:10, 19 August 2008 (UTC)

Edit war solution
See for context: I fully support anyone on the Ethics project being able to create and own a learning resource page or section of a page if that is what it takes to end an edit war. WAS 4.250 16:01, 24 August 2008 (UTC)
 * http://en.wikiversity.org/w/index.php?title=Ethical_Management_of_the_English_Language_Wikipedia/Case_Studies2&diff=311179&oldid=309256
 * User talk:WAS 4.250

 * See my reply here. I recommend the disclosure template:

Hillgentleman|Talk 16:39, 24 August 2008 (UTC)

 * Hillgentleman asks: "What can be done to turn the perceived disruptive behaviour to something more creative? How can it be done without wasting the time of good editors?"

 * Salmon of Doubt asks: "What can be done to get rid of disruptive trolls without wasting the time of good editors?"

 * I would like to propose a tentative ethical best practice that simultaneously responds to both questions, from either perspective or point of view.

 * Moulton 16:47, 24 August 2008 (UTC)

Taboo Or Not Taboo? That Is the Question.
Hillgentleman, please weigh in on a perplexing and confusing policy issue that SBJ has buck-passed to you... Johnny, I have a question about an enforcement practice that has me confused. It has to do with IP editors.

A few weeks ago, when I was noticing some IP edits, I did reverse DNS lookups on them and posted the reverse lookups (which revealed that the IPs belonged to well-known Wikipedians whose IP addresses are well-known via their symbolic domain names). My recollection is that you reverted those disclosures linking IP numbers to avatar names. This was consistent with other wrist-slapping by Lar and others regarding reprehensible and unforgivable departures from WP:Privacy.

Now today, I discover that it's not only legal to post avatar names associated with IP edits, it's evidently mandatory to do so.

So I'm confused, Johnny. Is it an egregious wrist-slapping violation of policy to post an avatar name after an IP edit, or is it mandatory to do so?

I personally don't care which way the policy is written (if there even is one at all), but I find it disturbing that different cops are enforcing it different ways on different days depending on who the vile miscreant is.

Please enlighten me.

Moulton 05:06, 29 August 2008 (UTC)

 * Moulton, stop being a trouble-maker. You know perfectly well that rule-based systems do not work. So do we. Therefore WikiMedia projects such as WikiVersity are not rule based; but instead are based on an overall consensus regarding purpose and values - you might even want to call it a social contract - which as you know, does work. So stop acting as if we were a rule based system. Also, there is a known conflict between our values of privacy and neutral point of view and consensus which requires preventing socks and dealing with conflict of interest. All value systems have internal conflicts. Consider yourself enlightened. WAS 4.250 08:16, 29 August 2008 (UTC)

 * One of the delightful features of a Social Contract is that, like a handsome framed Ketubah, it disclose the promises we've all honorably agreed to keep with respect to each other. I am still confused over the contents of the list of promises that we have not yet uttered aloud (in TeamSpeak) or visibly posted on the Ketubah Wall.

 * While I have you on the line, WAS, can you explain to me the rule (or taboo) here (in these hallowed halls of scholarly research) against wading through a sea of troubles and, one by one, discovering the best ethical practices for navigating them (with or without memorable Shakespearean rhetoric)?

 * Moulton 11:28, 29 August 2008 (UTC)

 * Taboo as far as I'm concerned. I think Hillgentleman's the guy to ask though... I'm going to be mostly AFK today. --SB_Johnny talk 11:58, 29 August 2008 (UTC)

 Moulton 13:33, 29 August 2008 (UTC)

 * Moulton, Thank you for your question. On the diff that you provided:   Information is information.  I think it is useful for the learners and editors to know that the comments are posted by (the alter-egos) of the better known author.  If a well-known user has posted with an IP-address or an alternative account, and if knowledge of such action is public on-wiki, and if there is no privacy concern, I would support adding such commentary.
 * I understand that sometimes we may have different shades of personalities; sometimes we may want to use different "pseudo-names" or "positions" to write different perspectives; Yet in a learning project, it is important to keep the perspective clear, it is also important to have maintain contact so that questions will be answered;
 * I think a good solution for you would be to use different signatures (or even register different account names and redirect them to your principal account) and still maintaining a link to your principal account. Hillgentleman|Talk 02:59, 1 September 2008 (UTC)

 * Note that when I signed on as a participant in the Ethics Project, I [[Talk:Ethical_Management_of_the_English_Language_Wikipedia/Participants_and_objectives#How_to_drive_yourself_crazy|

disclosed my intention to employ some dramaturgical characters]] who represent different "voices" in didactic sketches, in the spirit of traditional educational storycraft. In a Muppet sketch, you would not expect Jim Henson to pause after voicing Kermit, pop up on camera, and say, "That was actually me enacting the voice of Kermit." Everyone who is paying attention to the didactic structure is aware of the credits, which need not be tediously repeated after every line of dialogue. Have you ever gone to the theater, and some kid in the audience calls out the name of the actor who has just entered in some dramatic role? It was abundantly clear to me that Salmon of Doubt was a "character" being portrayed by some otherwise unidentified editor associated the WikiClique on ID on en:WP. It was thus appropriate to engage him with suitably crafted dramaturgical characters of my own. That's precisely what I (and other didactic educators) devise such characters for. —Moulton 04:07, 1 September 2008 (UTC)

 * As I said, a solution is to sign your signature like this: "mickey mouse", or register alternative accounts for your alteregos, like some wikiversitians have done.  I don't mind either, but you need to keep a link so that people who come later know where to go if they want to ask questions.  And if user:salmon of doubt is an alternative account of a well-known wikipedia user, it would be great if we know whom she is.  But we don't know.   Hillgentleman|Talk 04:55, 1 September 2008 (UTC)

 * Those alter ego signatures all had links taking you to pages that unmistakeably identified and defined them. Did you follow any of the links and read them to familiarize yourself with the characters and their distinctive voices and perspectives? —Moulton 14:31, 1 September 2008 (UTC)

 * I think I did, and I have just tried again. That is very interesting, and I confess I haven't got round to read it through; but how can I (or someone who comes here later) contact Montana Mouse if I want to ask her questions? Hillgentleman|Talk 14:49, 1 September 2008 (UTC)

 * Montana Mouse has an e-mail address: montana  musenet org
 * Barsoom Tork has an e-mail address: barsoom  musenet org
 * You can also visit them at Moulton's Playspace at WorldCrossing. —Moulton 17:20, 1 September 2008 (UTC)

 * My concern with using those sigs is that Moulton has a history of collecting IP addresses from people who visit his site and using that information to identify who a non-self-identified user really is. --SB_Johnny talk 16:54, 1 September 2008 (UTC)

 * You can leave messages for any of the Muppets on Moulton's talk page, too. —Moulton 17:20, 1 September 2008 (UTC)

 * That's fine if you're leaving a link, but you're not. And your also not disclosing that you track IPs viewing your blog... sorry Barry, but it really is shady to do it that way. --SB_Johnny talk 18:37, 1 September 2008 (UTC)

 * I've created User sub-pages and User_talk sub-pages for the Muppet characters. I'll go back and update the signatures to link to the new on-wiki User sub-pages and User_talk subpages.  —Moulton 19:55, 1 September 2008 (UTC)

title: User talk:Hillgentleman/20080903


text:
Hospice

Hospice
Hospice is a special concept of care designed to provide comfort and support to patients and their families. Patients are referred to hospice when life expectancy is approximately six months or less. Hospice care can continue longer than six months if needed but requires physician certification.

* Hospice is not a place. Most hospice care takes place within the dying person’s home, whether it is his or her own home, the home of a family member or friend, a nursing or        assisted living facility. Other options, if available from the provider, include a       residential hospice facility or a hospice unit within a hospital.

* Hospice care neither prolongs life nor hastens death. Hospice staff and volunteers offer a specialized knowledge of medical care, including pain management.

* The goal of hospice care is to improve the quality of a patient's last weeks, days and hours by offering comfort and dignity.

* Hospice care is provided by a team-oriented group of specially trained professionals (including as physicians, nurses, social workers, clergy), as well as volunteers and family members.

* Hospice addresses all symptoms of a disease, with a special emphasis on controlling a        patient's pain and discomfort.

* Hospice deals with the emotional, social and spiritual impact of the disease on the patient and the patient's family and friends.

* Hospice offers a variety of bereavement and counseling services to families before and after a patient's death.

* Hospice professionals make routine visits to the home, but family and/or friends are nearly always involved in care. Some families choose to hire additional services from private nursing agencies, which are typically not covered by Medicare, Medicaid or       private insurance.

* Hospices use trained volunteers to help with household chores and to give family caregivers respite time. For example, a volunteer can give the family caregiver a chance to run errands or simply take a walk or nap.

* If a patient’s condition improves during hospice care or if the patient desires, the patient can discontinue hospice care.

Finding a Hospice Near You
http://iweb.nhpco.org/iweb/Membership/MemberDirectorySearch.aspx?pageid=3257&showTitle=1

http://www.hospicedirectory.org/

http://www.HospiceBasics.com

Source: (2008).What is Hospice? Hospice Foundation of America. Retrieved September 3, 2008, from https://www.hospicefoundation.org/

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Hospice


text:
User talk:Eas4200c.f08.aero6.loper

facebook Boeing 787 Dreamliner

title: User talk:Eas4200c.f08.aero6.loper


text:
User talk:Eas4200c.f08.vqcrew.d

 Hello Eas4200c.f08.vqcrew.d, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 19:53, 3 September 2008 (UTC)

title: User talk:Eas4200c.f08.vqcrew.d


text:
User talk:Eas4200c.f08.team12.taylor

 Hello Eas4200c.f08.team12.taylor, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 19:53, 3 September 2008 (UTC)

title: User talk:Eas4200c.f08.team12.taylor


text:
User:Eas4200c.f08.blue.d

Testing out the wiki page.

title: User:Eas4200c.f08.blue.d


text:
User:Eml4500.f08.wiki1.aguilar/Example

This is a test.

title: User:Eml4500.f08.wiki1.aguilar/Example


text:
User talk:Eml4500.f08

 Hello Eml4500.f08, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 20:42, 3 September 2008 (UTC)

two requests
Most of your students who are uploading images to Wikiversity are not providing the required source and licensing information. Some of the uploaded images appear to be copyrighted material that will have to be deleted from Wikiversity. Could you remind your students not to upload copyright-protected content to Wikiversity? Most Wikiversity content must be licensed so as to allow for free duplication/modification. We can have a small amount of fair use content, but it must be used only in the main namespace (and NOT in the user namespace) for a clearly defined educational purpose. Please see Uploading files for more information. Also, are you willing to go into your user preferences (the "my preferences" link at the upper right of Wikiversity pages) and activate an email address? It would be nice to have a way to contact you by email when Wikiversity is having a problem with your students. Thanks. --JWSchmidt 16:34, 9 September 2008 (UTC)
 * Thanks for informing me. I already informed my students about the above problem, and pointed them to this wiki page.  In the future, please feel free to send me direct e-mail (you can find my e-mail address easily on the web).  Thank you again.  Eml4500.f08 14:11, 10 September 2008 (UTC)

User subpages
Hi, my name is James Neill, from University of Canberra, Australia. I'm a Wikiversity custodian and also teach some classes with students contributing to Wikiversity, so am very pleased to see your students so busy here! :). One suggestion I have is around shifting student notes and user-specific homework exercises into user subpages (and keeping them out of the mainspace). The other suggestion I have is that perhaps they could also work in the mainspace on improving the MATLAB page, and adding their content into subpages of that page (or a related course page). You might also be interested to see my comment on the MATLAB talk page. Hope this helps and please let me know if you would like any further explanation or examples, etc. PS I saw above you like to be emailed; I'm not sure of your name, but I will try to use wiki email. -- Jtneill - Talk - c 16:24, 12 September 2008 (UTC)
 * I just tried to send wiki email, but for it to work you would need you to activate your email (in "my preferences"). -- Jtneill - Talk - c 16:26, 12 September 2008 (UTC)
 * Hi, thanks for your comments. Actually, the students have been instructed to work only in their user namespace, and not in the main namespace.  Regarding e-mail communication, you may want to check out the bottom of this wiki page. Eml4500.f08 15:43, 13 September 2008 (UTC)
 * Great, thanks for that. I'll post here any mainspace pages I come across that I think should be in user subpages. Hope this works for you. Let me know if you'd prefer another way.
 * -- Jtneill - Talk - c 21:37, 15 September 2008 (UTC)

Notified

 * Lecture_Notes:
 * -- Jtneill - Talk - c 21:37, 15 September 2008 (UTC)

 * HOMEWORK 2
 * -- Jtneill - Talk - c 02:07, 17 September 2008 (UTC)

 * Matlab Tutorial
 * Lecture Notes 1
 * -- Jtneill - Talk - c 08:37, 17 September 2008 (UTC)

 * Eml4500.f08.FEABBQ
 * Eml4500.f08.FEABBQ.Jayma/notes1
 * -- Jtneill - Talk - c 23:12, 17 September 2008 (UTC)

 * Eml4500.f08.FEABBQ/HW2
 * Eml4500.f08.FEABBQ/HW2/Notes
 * -- Jtneill - Talk - c 23:27, 17 September 2008 (UTC)

 * Team Aeris - Homework 1
 * -- Jtneill - Talk - c 02:41, 18 September 2008 (UTC)

 * Loops in Matlab
 * -- Jtneill - Talk - c 10:25, 18 September 2008 (UTC)

 * Eml4500.f08/Matlab Summary
 * Matlab_Examples:
 * Getting Started
 * Matrices
 * Vectors in Matlab
 * Systems of Equations
 * Loops in Matlab
 * Graphing in Matlab
 * -- Jtneill - Talk - c 22:13, 18 September 2008 (UTC)

 * Node 1 Equilibrium
 * -- Jtneill - Talk - c 16:18, 21 September 2008 (UTC)

 * Homework 2: Lecture Notes (Contribution)
 * -- Jtneill - Talk - c 16:46, 21 September 2008 (UTC)

 * EML4500.f08.Ateam.paquette/Homework1
 * EML4500.f08.Ateam.paquette/Homework2
 * -- Jtneill - Talk - c 22:53, 21 September 2008 (UTC)

 * Eml4500.f08.bike.mcdonald/homework report 2
 * -- Jtneill - Talk - c 23:03, 21 September 2008 (UTC)

 * Eml4500.f08.group/Homework2/Lecture Notes
 * -- Jtneill - Talk - c 01:43, 22 September 2008 (UTC)

 * EML4500.f08.Ateam.Miller/homework2
 * -- Jtneill - Talk - c 04:24, 22 September 2008 (UTC)

 * Eml4500.f08.qwiki/Lecture 7
 * -- Jtneill - Talk - c 22:20, 22 September 2008 (UTC)

 * HW2
 * -- Jtneill - Talk - c 22:32, 22 September 2008 (UTC)

 * Lecture Summaries
 * 9/8/2008
 * Homework2:
 * -- Jtneill - Talk - c 03:46, 23 September 2008 (UTC)

 * Eml4500.f08.qwiki/Lecture 7
 * -- Jtneill - Talk - c 22:56, 23 September 2008 (UTC)

 * DO HW2
 * -- Jtneill - Talk - c 00:23, 24 September 2008 (UTC)

 * HW1
 * -- Jtneill - Talk - c 01:31, 24 September 2008 (UTC)

 * Matlab Examples
 * -- Jtneill - Talk - c 04:14, 24 September 2008 (UTC)

 * Homework 2
 * -- Jtneill - Talk - c 23:42, 24 September 2008 (UTC)

To be notified

 * Eml4500.f08.team.dwyer.jd/HW2
 * -- Jtneill - Talk - c 14:01, 25 September 2008 (UTC)

 * Homework Problems - solved via email
 * Notes Monday September 15th
 * --Gbaor 06:53, 26 September 2008 (UTC)

 * Hw 2
 * -- Jtneill - Talk - c 23:34, 26 September 2008 (UTC)

 * HW 1 Contribution
 * -- Jtneill - Talk - c 03:06, 29 September 2008 (UTC)

 * HW 2 Contribution
 * 9-22-08
 * --Gbaor 16:22, 29 September 2008 (UTC)

 * Homework 3
 * Homework 2
 * Eml4500.f08.wiki1.schaet.hw3
 * Homework 1
 * Eml4500.f08.bottle.butler:Homework/3
 * Homework 3 Contributions
 * HW
 * --Gbaor 20:38, 8 October 2008 (UTC)

Disturbance
Apologies for the possible disturbance, I might have brought to your project by reverting few blanked-out pages. Blanking out valuable content is a common behavior of vandals, and when I saw IPs blanking out pages, I reverted them. Just after it I saw, that it was due to move of these pages to subpages, as it was required. In future please advise to your students, that they sould insert also delete or delete my page template. In this case the less informed users/custodians (like me) would know whats going on and what to do in order to help your project and maintain WV. :) Another question: The blanked out pages at "Notified" section could be deleted? --Gbaor 08:40, 25 September 2008 (UTC)
 * Thank you. I have put in a new warning message.  Please give the students some time before deleting these pages in case they need to recover anything.  Thanks.  Eml4500.f08 10:10, 25 September 2008 (UTC)
 * No problem. I don't want to destroy anybody's work. Just make sure that the deletion templates will be put there after everything was moved. In case the page is deleted with some required content on it, there is still a possibility to undelete it, if one knows it's exact name. (The deletion just "hides" the page, but it still exists in the database.)--Gbaor 12:20, 25 September 2008 (UTC)
 * This is a bit post-hoc, I'm sorry, but perhaps useful for next time. In retrospect I think we could/should have created a template with a custom warning which could have been transcluded on students' pages in the mainspace. Then it would have been relatively easy to update warnings/communications to editors of those pages. -- Jtneill - Talk - c 12:44, 25 September 2008 (UTC)

course experiences
Hi! I am just wondering if you are planning to sum up your experiences with your class project on WV. Sort of case study and recommendations for other people, who want to do something similar with their students. I am particularly interested, how the students reacted to the fact that they won't contribute under their chosen nickname, but under username of (partially) fixed format. --Gbaor 05:14, 18 September 2008 (UTC)
 * Students were given the choice of using anonymous (but structured) wiki usernames; see, e.g., the bottom of this wiki page to preserve their identity to others (except to the professor and TAs), even though most did not mind to use their last name. Eml4500.f08 12:06, 29 September 2008 (UTC)

Image uploading by students on wikimedia commons
Hi, could you have your students categorize their problem set and other images when they upload them to the commons? I created a category for the images here; to include the images in this category they should include the wikitext. Thanks! 66.31.42.26 12:27, 28 October 2008 (UTC)

Learning materials?
Hello. I was going through Special:ShortPages and noticed a large amount of pages which have apparently been moved to userspace pages by your students. This got me to wondering if there's any main namespace content being created, or if the class is just using Wikiversity for homework assignments.

I guess I'm just not really sure whether that's within our scope... were any learning materials added to Wikiversity that could be used by other students, instructors, and interested parties in the future? In particular, I noticed one page in the Matlab project that seemed to be a good addition, but that page was blanked as well.

I'll open a discussion about this on the colloquium sometime later today. Please encourage your students to take part in it! --SB_Johnny talk 14:24, 19 December 2008 (UTC)

Block
User:Unstoppable Fandal needs a block. I've sorted out the Main Page and reverted all his (I doubt if that was a woman) edits. Here's ... that appeared on the Main Page and here's ... that appeared on the Main Page, I've checked and the image is one of yours.

User:Silentassassin hasn't vandalized (yet?) though the account was created almost at the same time as Unstoppable Fandal. I don't know if that is an acceptable username at Wikiversity but the account certainly needs to be watched.

Are you a sysop? If you aren't do you know any sysop who is currently active? Proxima Centauri 08:34, 28 June 2009 (UTC)

Thank you!
Thanks for your steady use of wikiversity over time, and your many contributions here. –SJ + > 07:44, 7 April 2010 (UTC)

title: User talk:Eml4500.f08


text: File:Wiki campus radio introduction 1.ogg


text: File:Intro to WikiWay theme.ogg

title: File:Intro to WikiWay theme.ogg


text:
File:Introduce teachingforthefuture interview of JWS.m4a.OGG

Summary
I (John Schmidt) made this for Wiki Campus Radio/Active audio stream.


text: File:Introduce hark.OGG

title: File:Introduce hark.OGG


text: File:Intro Wikiversity Reports.OGG

title: File:Intro Wikiversity Reports.OGG


text:
User talk:EML4500.f08.A-team.VandenBerg

 Hello EML4500.f08.A-team.VandenBerg, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 21:39, 3 September 2008 (UTC)

title: User talk:EML4500.f08.A-team.VandenBerg


text:
User:Eml4500.f08.bike.mcdonald

Introduction
This Wikiversity page will be used to organize the Homework Reports and other class information for EML 4500 - Finite Element Analysis and Design, taught by Professor Loc Vu Quoc at the University of Florida. My name is Andrew McDonald, and I am a Mechanical Engineering senior at the University of Florida. I am the group coordinator of Team Bike, thus all class material for submission will be posted on this Wikiversity page.

Team Members
Information for each member of Team Bike can be found below.

 * Sam Bernal - sbernal4@ufl.edu
 * Shawn Gravois - spggsr@ufl.edu
 * Andrew McDonald - drewmcd@ufl.edu
 * Garrett Pataky - reet@ufl.edu
 * Bobby Sweeting - ccrunna2@ufl.edu
 * Eric Viale - ickabod@ufl.edu

Homework Reports
The homework reports for Team Bike will be posted in this section.

 * Homework Report 1
 * Homework Report 2
 * Homework Report 3
 * Homework Report 4
 * Homework Report 5
 * Homework Report 6
 * Homework Report 7

title: User:Eml4500.f08.bike.mcdonald


text:
User:Eas4200c.f08.radsam.r

November 21th
3) Back to superposition:

$$q_{ij}=\tilde {q}_{ij} + q_{k}\,$$

M) Multi-cell  M.1) w/o stringers

$$R^Z=\sum_{i=1}^{N_{cells}}R_i^Z\,$$ Ncells = # of cells

RiZ = 0. ==> RZ = 0.

M.2) w/ stringers

RZ = RZ1 + RZ2

Recall $$R^{Z_1}=\sum_{i=1}^{N_{cells}}R_i^{Z_1}=0\,$$ ==> RZ = RZ2 = VZ = 0.

title: User:Eas4200c.f08.radsam.r


text:
User:Eml4500.f08.bike.mcdonald/Subpage

This is Andrew McDonald's Subpage to the user namespace.

title: User:Eml4500.f08.bike.mcdonald/Subpage


text:
User:Eas4200c.f08.radsam.m

= Lecture Notes=

title: User:Eas4200c.f08.radsam.m


text:
User:Eas4200c.f08.radsam

=Homework #1=
 * Homework #1: Current version and submitted archived version.

=Homework #2=
 * Homework #2

=Homework #3=
 * Homework #3

=Homework #4=
 * Homework #4

=Homework #5=
 * Homework #5

=Homework #6=
 * Homework #6

=Homework #7=
 * Homework #7

=Notice Board=

 * If you have suggestions for the wikiversity vs. e-learning comparison, add them into the table under the HW section, por favor.

Homework 7:

 * radsam.a: 11/17 and pics from 11/19 to 12/1
 * radsam.d: 12/01/08 and 12/05/08
 * radsam.z: 11/24 and 12/8 (if its too long, then I'll do half and somebody else will have to split it with me, since the 24th is pretty long....that's what she said)
 * radsam.r: 11/19 and 11/21
 * radsam.m: Matlab (how fun)
 * radsam.s: 12/3

title: User:Eas4200c.f08.radsam


text:
University of Florida/Eas4200c.f08.radsam/Structures and Materials

Preface
What is involved in Aerospace Structures (AS)?

AS, analysis of structural composition in airplanes, is governed by partial differential equations (PDEs), which can be solved using the finite element method (FEM). The FEM is used widely in all fields of engineering, applied math, and geologic exploration.

Several concepts will be emphasized in this course:
 * Understanding of mechanics
 * Ability to formulate equations
 * Ability to judge the correctness of a solution (via FEM), and to
 * Avoid old ad hoc methods of structural analysis.


text:
User talk:Eas4200c.f08.radsam

 Hello Eas4200c.f08.radsam, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 23:42, 3 September 2008 (UTC)

title: User talk:Eas4200c.f08.radsam


text:
User talk:Eas4200c.f08.radsam.m

 Hello Eas4200c.f08.radsam.m, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 23:42, 3 September 2008 (UTC)

title: User talk:Eas4200c.f08.radsam.m


text:
User talk:Eml4500.f08.bike.mcdonald

 Hello Eml4500.f08.bike.mcdonald, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 23:42, 3 September 2008 (UTC)

title: User talk:Eml4500.f08.bike.mcdonald


text:
User talk:Eas4200c.f08.radsam.r

 Hello Eas4200c.f08.radsam.r, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 23:43, 3 September 2008 (UTC)

Sup r, do you have sources for these two pics? We need to cite them before VQ gets wind of the fact that we haven't.

Thanks. Eas4200c.f08.radsam.a. 03:17, 23 September 2008 (UTC)

title: User talk:Eas4200c.f08.radsam.r


text:
User talk:Eas4200c.f08.radsam.d

 Hello Eas4200c.f08.radsam.d, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 23:43, 3 September 2008 (UTC)

title: User talk:Eas4200c.f08.radsam.d


text:
User:Eas4200c.f08.blue.a

Team Blue Members:
Mark - mabarry@ufl.edu (Team Coordinator) Clay - clay246@gmail.com Jeffrey - jeffrey8@ufl.edu Tom - switch31@ufl.edu Christan - garabaya@ufl.edu Marc - mrpellet@ufl.edu Wei-Teck Lee - arkteck@ufl.edu

Lecture Notes
Note: Homework Reports are now due every 2 weeks. I went ahead and set up a rotation for the lectures. If you need to switch with someone. Feel free to switch lectures if you need to.

'''Please go by the date when doing the lecture notes. I made a mistake and got the lecture numbers mixed up so for the future, go by the lecture date, not number!!'''

Lecture 1, August 25th, 2008

Lecture 1

Lecture 2, August 27th, 2008

Lecture 2

Lecture 3, August 29th, 2008

Lecture 3

Lecture 4, September 3rd, 2008

Lecture 4

Lecture 5, September 5th, 2008

Lecture 5

Lecture 6 and 7, September 8th and 10th, 2008 Thomas Sexton

Lecture 6

Lecture 8, September 12th, 2008 Christian Garabaya

Lecture 8

Lecture 9, September 15th, 2008 Clay Robertson

Lecture 9

Lecture 10, September 17th, 2008 Jeffrey Shea

Lecture 10

Lecture 11, September 19th, 2008 Mark Barry

Lecture 11

Lecture 12, September 22nd, 2008 Marc Pelletier

Lecture 12

Lecture 13, September 26th, 2008 Thomas Sexton

Lecture 13

Lecture 14, September 29th, 2008 Christian Garabaya

Lecture 14

Lecture 15, October 1st, 2008 Clay Robertson

Lecture 15

Lecture 16, October 3rd, 2008 Jeffrey Shea

Lecture 16

Lecture 17, October 6, 2008 Mark Barry

Lecture 17

Lecture 18, October 8th, 2008 Marc Pelletier

Lecture 18

Lecture 19, October 10th, 2008 Thomas Sexton

Lecture 19 Lecture 20b Lecture 20, October 13th, 2008 Christian Garabaya

Lecture 20

Lecture 21, October 15th, 2008 Clay Robertson

Lecture 21

Lecture 22, October 17th, 2008 Jeffrey Shea

Lecture 22

October 20th, 2008 Mark Barry

October 20th, 2008

October 22nd, 2008 No Notes - Exam

October 22nd, 2008

October 24th, 2008 No Notes - Homecoming

October 24th, 2008 October 27th, 2008 Tom Sexton

October 27th, 2008

October 29th, 2008 Clay Robertson

October 29th, 2008

October 31st, 2008 Jeffrey Shea

October 31st, 2008

November 3rd, 2008 Christian Garabaya

November 3rd, 2008

November 5th, 2008 Mark Pelletier

November 5th, 2008

November 7th, 2008 Tom Sexton

November 7th, 2008

November 10th, 2008 Clay Robertson

November 10th, 2008

November 12th, 2008 Jeffrey Shea

November 12th, 2008

November 14th, 2008 Mark Barry

November 14th, 2008

November 17th, 2008 Christian Garabaya

November 17th, 2008

November 19th, 2008 Mark Pelletier

November 19th, 2008

November 21st, 2008 Tom Sexton

November 21st, 2008

November 24th, 2008 Clay Robertson

November 24th, 2008

December 1st, 2008 Jeffrey Shea

December 1st, 2008

December 5th, 2008 Wei-Tek lee

December 5th, 2008

December 8th, 2008 Whoever wants to do it

December 8th, 2008

Homework Reports
Homework Report # 1 - DO NOT EDIT UNTIL EVERYONE HAS TURNED IN LECTURE NOTES!!

Homework Report 1

Homework Report # 2 - DO NOT EDIT UNTIL EVERYONE HAS TURNED IN LECTURE NOTES!!

Homework Report 2

Homework Report # 3 - DO NOT EDIT UNTIL EVERYONE HAS TURNED IN LECTURE NOTES!!

Homework Report 3

Homework Report # 4 - DO NOT EDIT UNTIL EVERYONE HAS TURNED IN LECTURE NOTES!!

Homework Report 4

Homework Report # 5 - DO NOT EDIT UNTIL EVERYONE HAS TURNED IN LECTURE NOTES!!

Homework Report 5

Homework Report # 6 - DO NOT EDIT UNTIL EVERYONE HAS TURNED IN LECTURE NOTES!!

Homework Report 6

Homework Report # 7 - DO NOT EDIT UNTIL EVERYONE HAS TURNED IN LECTURE NOTES!!

Homework Report 7

title: User:Eas4200c.f08.blue.a


text:
User talk:Eas4200c.f08.radsam.z

 Hello Eas4200c.f08.radsam.z, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 23:44, 3 September 2008 (UTC)

What's up man, feel free to put your stuff in the main article w/e you want. :-D Eas4200c.f08.radsam.a. 00:29, 8 September 2008 (UTC)

Hey, did you happen to do section 1.2.2? I only see 1.2.3... :) Eas4200c.f08.radsam.a. 17:53, 11 September 2008 (UTC)

title: User talk:Eas4200c.f08.radsam.z


text:
User talk:Eas4200c.f08.blue.a

 Hello Eas4200c.f08.blue.a, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

 * Take a guided tour and learn to edit.
 * Visit a (kind of) random random project.
 * Browse everything on Wikiversity, or visit a portal corresponding to your educational level: pre-school, primary, secondary, tertiary, non-formal education.
 * Find out about research activities on Wikiversity.

 * Read an introduction for teachers and find out how to write an educational resource for Wikiversity.
 * Give feedback about your initial observations
 * Discuss Wikiversity issues or ask questions at the colloquium.
 * Chat with other Wikiversitans on #wikiversity-en.

And don't forget to explore Wikiversity with the links to your left. Be bold to contribute and to experiment with the sandbox or your userpage, and see you around Wikiversity! --JWSchmidt 23:45, 3 September 2008 (UTC)

title: User talk:Eas4200c.f08.blue.a


text:
User:Eas4200c.f08.blue.f/Lecture 1

Contact Information
Instructor: Dr. L. Vu-Quoc

 * Telephone: 392-6227
 * Email: vu-quoc@ufl.edu
 * Course Website: EGM4200c Aerospace Structures
 * Office: NEB 135 (New Engineering Building)
 * Classroom: MAE-A 303
 * Class Time: MWF, period 4 (10:40 am - 11:30 am)
 * Office Hours: MWF, period 9 (4:05 pm - 4:55 pm)

Brief Summary of Course Objectives
The objective of the course "Aerospace Structures" is to establish an understanding of the mechanics of aerospace structures. With this, the student will develop the ability to formulate problems pertaining to aerospace structures and judge the correctness of the solutions formulated. In developing these methods, old methods will be avoided and partial differential equations will be solved by new methods like the finite element method.

Informative Links
| Aerospace Engineering

| Aerospace Structures

| MAE at The University of Florida

title: User:Eas4200c.f08.blue.f/Lecture 1


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User:Uf.team.aero

Team Aero Roster

We can all edit this user namespace to build our hw assignments, then post to one of our class user accounts for submission.

HW 1

HW 2

HW 3

HW 4

HW 5-Notes Assignments

HW 6-Notes Assignments

HW 7-Notes Assignments

title: User:Uf.team.aero


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User talk:Uf.team.aero

 Hello Uf.team.aero, and welcome to Wikiversity! If you need help, feel free to visit my talk page, or contact us and ask questions. After you leave a comment on a talk page, remember to sign and date; it helps everyone follow the threads of the discussion. The signature icon in the edit window makes it simple. To get started, you may

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title: User talk:Uf.team.aero


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User:Eas4200c.f08.radsam/Preface

= Preface = What is involved in Aerospace Structures (AS)?

AS, the analysis of structural composition in airplanes, is governed by Partial Differential Equations (PDEs), which can be solved using the Finite Element Method (FEM). The FEM is used widely in all fields of engineering, applied math, and geologic exploration.

Several concepts will be emphasized in this course. The understanding of mechanics will be an important asset contributing to the success of the student. The ability to formulate equations will be a necessary requirement as well as being able to judge the correctness of a solution (via FEM). In addition to these things, we will try to avoid old ad hoc methods of structural analysis, as newer methods of analysis have been up-and-coming in recent years.

 Warning: You need to provide a reference for the "justification" below (book's preface). Eml4500.f08 13:06, 22 September 2008 (UTC)

Error corrected: Eas4200c.f08.radsam.a. 16:00, 23 September 2008 (UTC)

=References=

title: User:Eas4200c.f08.radsam/Preface


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User:Eas4200c.f08.radsam/Structures and Materials

=1.1 - Introduction= Weight is the key differing factor between aerospace structures and all other structures. It is also the focus of aerospace material design and development, in that materials with high strength and stiffness and light weight are constantly being sought out.

No excess material is allowed in the design of aircraft, and this point alone is a major driving factor for the direction taken in aircraft design. Further still, more restrictions are in place when designing, say, wing structures, in that the wings are originally formed for maximum aerodynamic performance--not structural integrity. Thus, structural solutions are forced to conform to the original aerodynamic designs, reducing the degree of freedom one has in terms of those solutions.

Traditionally, metals such as aluminum and titanium have been employed to fulfill necessary design requirements. Recently, however, advanced composites have been used more and more and at a weight savings of up to 40% over customary metals, too. As an example, the latest Boeing airliner--the 787--uses up to 50 percent composites in its structural components.

=1.2 - Basic Structural Elements in Aircraft Structure= Aircraft structures are composed of several structural elements, which are designed to withstand various types of loads. It is the combination of these elements that make the entire structure of an aircraft capable of resisting applied loads.

For better comprehension of structural mechanics, we must introduce a few important definitions:

 * Stiffness: It is an extensive material property that determines the resistance of an elastic body to deflection. In Engineering, the modulus on elasticity or Young's Modulus (E) is an extremely important characteristic of materials, which shows how much a given material will be able deflect before a permanent deformation occurs. The Young's Modulus or is the radio of applied stress to strain: E = $$\displaystyle \sigma$$/$$\displaystyle \epsilon$$

 * Strength: The strength of a material is the ability to resist an applied force. In engineering, the Yield strength ($$\displaystyle\sigma$$y) is defined as "the stress at which a material begins to deform plastically." Elastic or elastoplastic materials are able to withstand certain loads and go back to their original shape when the given load is removed. This effect will occur as long as the applied stress is less than the Yield stress (strength). However, if the applied load exceeds the yield stress, the material will deform permanently even when the load is removed. If the strain or deformation keeps increasing, the material may reach its ultimate rupture stress ($$\displaystyle\sigma$$u) point where it will break.

 * Toughness: The difference between toughness and fracture toughness is that the former is the ability of a material to resist fracture, while the latter is the ability of the material to resist fracture when a crack is already present. If a material has a high value of fracture toughness, it will most likely undergo ductile fracture. This means that it will have the ability to bend (passed the yield strength) before it fractures. On the other hand, if a material has a low value of fracture toughness, such as ceramics, it will undergo brittle fracture.

1.2.1 - Axial Member

 * {| class="toccolours collapsible collapsed" style="width:100%"

! Axial Member

The length of axial members is significantly larger than their cross-sections and are meant to hold compressive and extensional loads applied along its length (axial direction). Deriving from the slope of the stress vs. strain curve, we may obtain a relation for the applied stress: $$\displaystyle\sigma$$ = E$$\displaystyle\epsilon$$

The applied stress $$\displaystyle\sigma$$ is equal to the applied force per the cross-sectional area of the axial member, so substituting in the above equation we obtain: F = EA$$\displaystyle\epsilon$$

EA is the axial stiffness, which is only a function of the Young's Modulus and the cross-sectional area. This tells us that the stiffness of a member does not vary by changing the shape of a cross-section unless the actual total area increases or decreases. For instance, if a member with a circular cross-section has the same area as a member with a square cross-section (or any other shape), the axial stiffness will be the same for both members. Axial members are good for tensile stresses but may cause buckling failure when compressed. Two ways of improving the buckling strength are to increase the bending stiffness or to shorten the buckle mode by adding supporting members at the joints.

In aircraft structures, aside of the longitudinal axial members, supporting members must be added at the wings and the fuselage to be able to withstand stresses. The two most important parts in a wing structure are the spars (2, refer to figure) and ribs (3). Spars extend lengthwise to the wing covering its entire length (from the fuselage to the wing tip). The main purpose of these members is to provide support to the wing and carry all loads back to the fuselage. The ribs on the other hand, give the aerodynamic shape to the wing while providing support to the spars.

Contribution by: radsam.d
 * }

1.2.3 - The Structural Beam

 * {| class="toccolours collapsible collapsed" style="width:100%"

! Bending Member (Beam)

The beam is an elemental structure used in all walks of life, from civil engineering to aerospace engineering. Beams provide structural support by providing resistance to bending moments. "A beam can also be used as an axial member carrying longitudinal tension and compression."

The bending moment is mathematically described to beam deflection as...

$$M=-EI\frac{d^2w}{dx^2}$$

where... EI= Bending stiffness of the beam I= Moment of Inertia

The Beam in Aerospace Structures
An example of a beam used in the aerospace industry is that in some airplane wings. This type of beam is called a cantilever beam, which is only supported in one end, carries both a bending moment and a transverse shear stress. However for a beam of large span/depth ratio, as in the case in aircraft wings, the bending stress is much greater than the shear stress.

The maximum bending stress at the root... $$\sigma_{max}=\frac{M_{max}(\frac{h}{2})}{I}$$

The maximum transverse shear stress distribution at the neutral plane... $$\tau_{max}=\frac{3}{2}\frac{V}{bh}$$

If we take the ratio of both the maximum bending stress and maximum shear stress... $$\frac{\sigma_{max}}{\tau_{max}}=\frac{4L}{h}$$

From this it is clear that the bending stress is the ruling factor in aircraft wings. So in order to address this issue aircraft engineers focus in the improvement of airfoils depending on the type of aircraft. For instance high performance military jet-aircraft, that undergo high-loading forces would definitely need stronger wings (cantilever beams) than say a cargo aircraft. In order to make an aircraft more "resistant" to these high bending forces, engineers design these type of aircraft with a low aspect ratio ...

$$AR = {b^2 \over S}$$                    where... b = wingspan S = planform area

Contribution by: radsam.Z
 * }

1.2.4 - Torsion Member

 * {| class="toccolours collapsible collapsed" style="width:100%"

! Torsion

Torque is very important when it comes to aircraft structures. Torsion is the twisting of an object due to an applied torque. In structural members of circular sections, the resultant shear stress acts in the plane of the cross-section. For solid or hollow cylinder of uniform circular cross-section and constant wall thickness, the torque is related to the twist angle $$\displaystyle\theta_{}$$ per unit length:

 * $$\displaystyle T = {G J \phi_{}} $$

Torsion of Circular Cylinders

where $$\displaystyle J $$ is the torsional constant.

The torsion constant is a geometrical property of a beam's cross-section which determines the relationship between angle of twist and applied torque.

Circle
$$ J = \frac{\pi b^4}{2} $$ b is the radius This is identical to the polar moment of inertia and is exact.

Hollow concentric circular tube
$$ J = \frac{\pi}{2} \left ( b^4 - a^4 \right ) $$ $$b$$ is the outer radius $$a$$ is the inner radius This is identical to the polar moment of inertia and is exact.

If the wall thickness $$\displaystyle t = b - a $$ is small enough compared to the inner radius, then the approximate expression of $$\displaystyle J $$ is given by:

$$\displaystyle J = {2 t \pi_{}r^3} $$

where $$\displaystyle r= \frac{(a+b)}{2} $$is the average value of the outer and inner radii.

Contribution by: radsam.r
 * }

=1.3 - Wing and Fuselage= A wing is a shaped surface used to produce lift for flight through the air. The wing shape is usually an airfoil. Wings are contoured to take maximun advantage of lift, and may be attached at the top, middle, or lower portion of the fuselage. These designs are referred to as high-, mid-, and low-wing respectively. Attached to the rear, or trailing edge, of the wings are two types of control surfaces referred to as ailerons and flaps. Ailerons extend from about the midpoint of each wing outward to the tip and move opposite to each other to achieve rotation movement about the airplane's longitudinal axis. Flaps extend outward from the fuselage to the midpoint of each wing. The flaps move donward so as to generate more lift at lower airspeeds.

The fuselage is an aircraft's main body section that holds the payload. The fuselage also serves to position the wings, powerplant and empennage. The empennage consists of the vertical stabilizer and the horizontal stabilizer. These two surfaces act like the feathers on an arrow to steady the airplane and mantain a straight path through the air.

The wing and the fuselage are the two major airframe components of an airplane, also the horizontal and vertical stabilizers have a very close resemblance to the wing.

1.3.1 - Load Transfer

 * {| class="toccolours collapsible collapsed" style="width:100%"

! Load In structural design, loads such as lift and weight cause stresses, deformations and displacements on of aircraft's main structure. Study of their effects is carried out by the methods of structural analysis such as bending, torsion and tension. Excess load or overloading may cause structural failure, such as wings clapping, empennage braking apart from the fuselage or severe structural damage and therefore such possibility should be either considered in the design or strictly controlled.

Contribution by: radsam.r
 * }

1.3.2 - Wing Structure

 * {| class="toccolours collapsible collapsed" style="width:100%"

! Wing Structure The wing produces lift acting as a beam and torsion member while transferring the force of lift to the fuselage. It takes the shape of an airfoil to generate the necessary lift for the aircraft. As such, the wing is subjected to tremendous forces throughout flight. In order to handle these forces the wing is built of spars, ribs, and the skin.

Contribution by: radsam.m
 * }

1.3.3 - Fuselage

 * {| class="toccolours collapsible collapsed" style="width:100%"

! Fuselage

The fuselage is subjected to concentrated forces from payloads and wing and landing gear reactions. The fuselage takes a circular cross-section due to the internal pressure. Shear stresses on the fuselage are carried by the skin along with hoop stresses. Stringers are added to the fuselage to reinforce the skin and carry axial forces. A circular frame is used to prevent buckling and reinforce the shape of the fuselage, along with shortening the length of the stringers.

Contribution by: radsam.m

 * }

=1.4 - Aircraft Materials=

Material selection has always been a driving force throughout the history of aeronautics. The technology involved with developing new materials has pushed next generation aircraft to be lighter, stronger, and more resistant to nature's elements. From the wood and canvas structures of early aircraft to modern-day titanium alloys and composites, aircraft have come a long way with the help of advances in material.

Currently, the common materials used in aircraft structures are aluminum, titanium, and steel alloys. The advantages and disadvantages of each are listed below:

 * Aluminum is relatively light weight, and has good fatigue life. It is not as strong as other materials and cannot stand high temperatures.
 * Steel Alloys are most used for their high strength. They are heavy and strongly affected by corrosion.
 * Titanium can withstand very high temperatures, and has good resistance to corrosion. It is, however, difficult to machine which makes its manufacturing cost higher.

Another material being used more frequently is fiber-reinforced composites. These composites are manufactured in a careful manner in order to provide maximum strength without being too brittle. Different types of composites exist, such as glass-fiber and carbon-fiber. The mechanical properties for some of these materials yield great strength to weight ratios, which make them an attractive option for aerospace applications.

Look at how far aircraft structures have come due to material influences in the span of a few decades:

 * An early Wright Brothers' airplane made of wood and canvas:
 * [[Image:flyght1.gif|200px|center|Wright's Brother First Flight]]
 * A modern-day airplane constructed mostly of composite materials:
 * [[Image:carbonf.jpg|200px|center|Composite Fuselage and Wings]]
 * [[Image:carbonf.jpg|200px|center|Composite Fuselage and Wings]]

=References=


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User:Eas4200c.f08.radsam.a.

It'sa meeeyaa, radsam.a!

title: User:Eas4200c.f08.radsam.a.


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User:Eml4500.f08.echo.lacroix

=Finalized=

HW1

=Drafts=

HW2

HW3

=Misc=

Journal Bearing Design

title: User:Eml4500.f08.echo.lacroix


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User:Eml4500.f08.Ateam.barry

Finite Element Analysis

MatLab Tutorial Summary/Explanation

MatLab is developed by the MathWorks Company. Below is their link for further information outside the scope of the document below.

About MatLab: MatLab is a matrix-based enginering computation program that is user-interactive. By using matrices to enter and solve complex equations, MatLab can do in a fraction of the time it would take older programming languages to do. When dealing with finite element analysis, depending on the number of nodes, there can be numerous partial differential equations that need to be solved.

Starting Matlab: MatLab can be started 2 ways. The first is using the command window and typing run/matlab. The second is through the start menu >> programs >> matlab.

Matrices: MatLab works solely with matrices to handle all computations. These matrices can range in size from 1 by 1 all the way up to thousands of elements. Entering a matrix into matlab is easy and is done with the following notation: A = [1 2 3; 4 5 6; 7 8 9] This creates a 3 by 3 matrix with the values shown and a new row started after each semi-colon. Additionally, matrices do not have to be entered with just real numbers. Complex numbers (i) can also be entered into matrices. For example: A = [1+3i; 2-4i; 3]

When it comes to large matrices, it may be very time consuming to enter in all the matrix values by hand. In such a case, the values can be read in from an ASCII file. As long as the file has a rectangular matrix in it, simply type: >> load numbers.ext This will load the matrix in the file numbers into the workspace.

Matrix Operations: MatLab uses the same basic mathematical operators plus a few additional ones. Below are the operators: * + addition * - subtraction * * muntiplication * / right division * \ left division * ^ power * ` conjugate The left division operator is special in that it allows for division of matrices that are not square. If you use the right division operator, MatLab will give an error saying that the matrices are not square.

Statements, Expressions, and Variables:

Matlab is an expression language meaning the user types an expression, usually composed of variables, functions, and operators, and Matlab interprets it and performs the expression. After the expression is evaluated, the output is put into a matrix. If no matrix name is specified by the user, matlab puts the result in a matrix called ans. Normally after each expression is evaluated, Matlab outputs the result of the expression. To supress(hold) the output, put a semi-colon at the end of the expression. Variables can have virtually any name you choose, as long as it is not a reserved variable or function name. Matlab is case sensitive but has no restriction on variable name length. Some Helpful Commands: * whos - displays a list of variables currently in the workspace Also, there are come commands that can be used to help the user build matrices Matrix Building Commands: * eye - identity matrix * zeros - matrix of zeros * ones - matrix of ones Each of the commands needs to be followed by the following notation: (# of rows, # on columns) Example: zeros(3,3) yeilds a square 3 by 3 matrix of zeros.

Loops:

Loops are used to repeat a series of operations until a certain condition is met. Below are the two types of loops that are used frequently in Matlab.

For:

For loops exectue continually once a condition is met up until the condition is no longer met.

function problem_1_37

% This function will plot 3 conditional functions

dx = 0.1; x = [-2:dx:6]; for k = 1:length(x) if x(k) >= 5 y(k) = 10*(x(k)-5) + 1; elseif x(k) >= -1 y(k) = 2 + cos(pi*x(k)); else y(k) = exp(x(k)+1); end end

plot(x,y), xlabel('Time x (seconds)'), ylabel('Height y (kilometers)')

While:

While loops are similar to for loops except for while loops are guaranteed to execute at least once. It will exectue the statement, then check it against the while statement. If it is true, it will run back through the loop. If it is false, it will exit the loop.

function e = macheps

% This function determines the smallest number that can be added to 1 in % Matlab and still get a number greater than 1.

e = 1; while (1+e >1) e = (e/2); end

e = e*2;

'''In addition to loops, one can have an operation performed only IF a condition is met. That type of operator is an if statement. Below is an example of an IF statement.'''

function y = problem_1_36(x) % This function will check conditional statements to evaluate a function given different input values. if x >= 5 y = 10*(x-5)+1; elseif x >= -1 y = 2+cos(pi*x); else y = exp(x+1); end

NOTE: All code was taken from my previous homework assignments in Numerical Methods

Relations:

The relational operators are used to compare the value of a variable to another variable or to a constant value. Below are some common relational operators: * == equal * ~= not equal * < less than * > greater than * >= greater than or equal to    * <= less than or equal to     * & and * | or    * ~ not

Relational operators are always used in for, while,and if statements to see when to execute, or stop executing expressions within the loop.

Scalar Functions:

Certain matlab functions operate on scalar numbers and when applied to a matrix, they act on 1 matrix element at a time. Some scalar Matlab functions are listed below: sin, cos, tan, asin, acos, atan exp, log, rem, abs, sqrt, sin, round, floor, ceil

Vector Functions:

Vector functions act on a vector matrix column by column to produce a row matrix as the solution. These functions can only be used when the matrix is larger than 1 by 1. Below are some examples of vector functions: max, min, sort, sum, prod, median, mean, std, any, all

Command Line Editing:

The command line in Matlab is denoted by 2 arrows (>>). The command line is the line that the user uses to type in commands. To keep the user from having to re-enter previously used commands, Matlab allows the user to scroll through the old commands used during the session by hitting the up-arrow and down-arrow keys.

Also, it is important to remember that instead of entering a series of commands by hand every time, create an m-file to execute. This will save loads of time and needless typing.

M-Files

M-files are special Matlab files that have a .m extension. These files contain a series of statements that can be exectued at one time, thus saving the user time from having to exectue expressions 1 at a time. There are two types of m-files, script files and function files.

Script files contain a series of normal Matlab scripts. They are traditionally used to enter large amounts of data into matrices. Any variable or matrix is global, meaning the parameter can be used in any other portion of the workspace.

Function files are a type of m-file that allow users to essentially create new Matlab functions. The functions can be specific to a particuar problem that the user is working on.

Text Strings

You can assign text strings to variables by using single quotes around the text to be entered into the variable. Additionally, text can be displayed to the screen using the disp function. The error function also outputs a message to the screen but also aborts the code in an m-file when it is executed. Below are examples of the 2 functions: disp('Hello World') error('Warning!!!')

Homework # 2 Lecture Notes
Assembly of Force Displacement Matrix The global force displacement matrix is assembled from the 2 element displacement matrices.

The Global Stiffness Matrix with symbolic representation:
 * $$\begin{bmatrix}

K^1_{11}&K^1_{12}&K^1_{13}&K^1_{14}&0&0\\ K^1_{21}&K^1_{22}&K^1_{23}&K^1_{24}&0&0\\ K^1_{31}&K^1_{32}&K^1_{33}+K^2_{11}&K^1_{34}+K^2_{12}&K^2_{13}&K^2_{14}\\ K^1_{41}&K^1_{42}&K^1_{43}+K^2_{21}&K^1_{44}+K^2_{22}&K^2_{23}&K^2_{24}\\ 0&0&K^2_{31}&K^2_{32}&K^2_{33}&K^2_{34}\\ 0&0&K^2_{41}&K^2_{42}&K^2_{43}&K^2_{44} \\ \end{bmatrix} $$

Note: The overlap in the 2 matrices comes from the fact that global node 2 is shared between both elements.

Calculating the Matrix Values:

K11 = k111 = 0.5625 K12 = k112 = 0.3247 K33 = k133 + k211 = 3.0625 K34 = k134 + k212 = -2.1752 K43 = k143 + k221 = -2.1752 K44 = k144 + k222 = 2.6875

Elimination of the known degrees of freedom reduces the global force displacement relationship. d1 = d2 = d5 = d6 = 0.

Two Bar Truss Matlab Example

Here is the Matlab code run for this example:

% Two bar truss example clear all; e = [3 5]; A = [1 2]; P = 7; L=[4 2]; alpha = pi/3; beta = pi/4; nodes = [0, 0; L(1)*cos(pi/2-alpha), L(1)*sin(pi/2-alpha); L(1)*cos(pi/2-alpha)+L(2)*sin(beta),L(1)*sin(pi/2-alpha)-L(2)*cos(beta)]; dof=2*length(nodes); conn=[1,2; 2,3]; lmm = [1, 2, 3, 4; 3, 4, 5, 6]; elems=size(lmm,1); K=zeros(dof); R = zeros(dof,1); debc = [1, 2, 5, 6]; ebcVals = zeros(length(debc),1); %load vector R = zeros(dof,1); R(4) = P;   % Assemble global stiffness matrix K=zeros(dof); for i=1:elems lm=lmm(i,:); con=conn(i,:); k_local=e(i)*A(i)/L(i)*[1 -1; -1 1] k=PlaneTrussElement(e(i), A(i), nodes(con,:)) K(lm, lm) = K(lm, lm) + k;   end K    R     % Nodal solution and reactions [d, reactions] = NodalSoln(K, R, debc, ebcVals) results=[]; for i=1:elems results = [results; PlaneTrussResults(e, A, ...           nodes(conn(i,:),:), d(lmm(i,:)))]; end format short g    results

Here are the results for the code:

k_local = 0.75       -0.75        -0.75         0.75

k = 0.5625     0.32476      -0.5625     -0.32476      0.32476       0.1875     -0.32476      -0.1875      -0.5625     -0.32476       0.5625      0.32476     -0.32476      -0.1875      0.32476       0.1875

k_local = 5   -5    -5     5

k = 2.5        -2.5         -2.5          2.5         -2.5          2.5          2.5         -2.5         -2.5          2.5          2.5         -2.5          2.5         -2.5         -2.5          2.5

K = 0.5625     0.32476      -0.5625     -0.32476            0            0      0.32476       0.1875     -0.32476      -0.1875            0            0      -0.5625     -0.32476       3.0625      -2.1752         -2.5          2.5     -0.32476      -0.1875      -2.1752       2.6875          2.5         -2.5            0            0         -2.5          2.5          2.5         -2.5            0            0          2.5         -2.5         -2.5          2.5

R = 0    0     0     7     0     0

d = 0           0        4.352       6.1271            0            0

reactions = -4.4378     -2.5622       4.4378      -4.4378

results = 1.7081      5.1244       8.5406       5.1244       17.081       0.6276       1.8828        3.138       1.8828

Homework # 3 Lecture Notes 9/29/08
Use the global force-displacement relationship

HW: Use the force displacement relationship: (6x2)x(2x1)=(6x1) Note: Only need to do computation for rows 1, 2, 5, 6 to get reactions F1. F2, F5, F6.

Take the 6x2 matrix:

 * $$\begin{bmatrix}

K^1_{13}&K^1_{14}\\ K^1_{23}&K^1_{24}\\ K^1_{33}+K^2_{11}&K^1_{34}+K^2_{12}\\ K^1_{43}+K^2_{21}&K^1_{44}+K^2_{22}\\ K^2_{31}&K^2_{32}\\ K^2_{41}&K^2_{42}\\ \end{bmatrix} $$

multiplied by the 2x1 matrix:

 * $$\begin{bmatrix}

d_3&d_4\\ \end{bmatrix} $$

and that yeilds the 6x1 reaction force matrix:

 * $$\begin{bmatrix}

F_1\\ F_2\\ F_3\\ F_4\\ F_5\\ F_6\\ \end{bmatrix} $$

Closing the loop between the FEM and Statics
-To close the loop between the finite element method and the method of statics, we use the principle of virtual displacement to solve for the reactions and thus the member forces in the 2 force body.

Two Bar Truss System

To solve the two bar truss system and thus close the loop here is the progression of steps:

FEM -> Compute Displacement -> Compute Reactions Statics -> Compute Reactions -> Compute Displacement When solved, both of these solution steps should yeild the same values for the reactions and displacement. This is how we can check our work.

We are given the 2-Force bodies for each element(1,2). By statics, the reactions are known and thus the member forces are known. Member Forces: P1 and P2 Next, we compute the axial displacement degrees of freedom. (This gives us the amount of extension in the bars) q2 = P1/K1 = BC  q1 = 0  (fixed node 1) q1 = -P2/K2 = AB  q2 = 0   (fixed node 3)

Question: How do we back out from the above results, the displacement degrees of freedom of node 2?

The dotted lines represent the deformed object and the solid lines represent the original object. The distances AB and CD are the displacements of node 2. Given the forces P1 and P2 we can back out the displacement of node 2.

Below is an explanation of the displacement in the figure above. This is why we can approximate the displacement in 1 direction as being zero and being the length of the bar multiplied by the displacement angle.

Homework Report # 4 Lecture Notes 10/15/08
Justification of assembly of element stiffness martix into global stiffness matrix.

k(e) = element stiffness matrix k = global stiffness matrix

Consider the example of the 2 bar truss: Recall the element force displacement (FD) relationship: k(e)*d = f(e)

Use the euler cut principle (Method 2) to solve for the forces. The euler cut principle states that node 2 should be in equilibrium. We take this and solve for the forces in each of the 2 bars.

Free Body Diagrams of elements 1 and 2.

The element degrees of freedom are given in the matrix: d(e). This is a 4x1 matrix.

For node 2, identify the global degrees of freedom to element degrees of freedom for both of the bars.

Now we can use the equilibrium concept from the euler cut method to solve for the forces.

Sum of forces in x direction: F = 0 = -f(1)3 - f(2)1 Sum of forces in y direction: F = 0 = P -f (1)4 - f(2)2

Next we use the element force displacement relationship to obtain the displacement of node 2: k(e)*d = f(e)

Lecture Notes 11/12/08
FEM Via Principle of Virtual Work (Continued from 11/10/08)

The finite element method uses a weighting matrix W to solve for the solution. The first set of solutions is for a bar element i. The PVW solution followes a similar pattern with the displacement matrix being replaced by the weighting matrix W.

$$ U(x_{i+1}) = d_{i+1} $$

Apply the same interpretation for the W(x) matrix: For example,

$$ W(x) = N_iW_i + N_{i+1}W_{i+1} $$

Element Stiffness Matrix for element i:

$$ \int_{x_i}^{x_{i+1}}{} [N_iW_i + N_{i+1}W_{i+1}](EA)[N_id_i + N_{i+1}d_{i+1}]dx $$

The Definition of $$ N_i and N_{i+1} $$ can be seen below:

$$ N_i = \frac{dN_i(x)}{dx} $$       $$ N_{i+1} = \frac{dN_{i+1}(x)}{dx} $$

Note:

$$ u(x) = \N_i(x) \N_{i+1}(x)| \begin{Bmatrix} d_i\\ d_{i+1} \end{Bmatrix} $$

The N(x) matrix is a 1x2 matrix and the d matrix is 2x1.

Taking the derivative yeilds the following:

$$ \frac{du(x)}{dx} = \N_i'(x) \N'_{i+1}(x)| \begin{Bmatrix} d_i\\ d_{i+1} \end{Bmatrix} $$

The N'(x) matrix is a 1x2 matrix and is called the B(x) matrix.

Similarly for the W matrix from the Principle of Virtual Work (PVW):

$$ W(x) = N(x) \begin{Bmatrix} W_i\\ W_{i+1} \end{Bmatrix} $$

$$ \frac{dW(x)}{dx} = B \begin{Bmatrix} W_i\\ W_{i+1} \end{Bmatrix} $$

Recall the Element DOFs:

$$ \begin{Bmatrix} d_i\\ d_{i+1} \end{Bmatrix} = \begin{Bmatrix} d_1^i\\ d_2^i \end{Bmatrix} d^{(i)} $$

$$ \begin{Bmatrix} W_i\\ W_{i+1} \end{Bmatrix} = \begin{Bmatrix} W_1^i\\ W_2^i \end{Bmatrix} W^{(i)} $$

From these relations, we can find the integral that contains both W and d.

$$ \int_{x_i}^{x_{i+1}}{} (BW^i)(EA)(Bd^i)dx $$

The B matrix relates d to W. (Principle of Virtual Work)

Our Goal now is to derive $$ W^i(k_id_i) $$ from the previous integral.

Re-write the integral with the EA in the front:

$$ \int_{x_i}^{x_{i+1}}{} (EA)(BW^i)(Bd^i)dx $$

Take the Transpose of the BW factor to eliminate the B matrix:

$$ \int_{x_i}^{x_{i+1}}{} (EA)(BW^i)^T(Bd^i)dx $$

Distribute the Transpose inside of the Parentheses:

$$ \int_{x_i}^{x_{i+1}}{} (EA)(B^TW^{iT})(Bd^i)dx $$

The W matrix is equal to its transpose so it can be removed:

$$ \int_{x_i}^{x_{i+1}}{} (EA)(B^TW^{i})(Bd^i)dx $$

What we are left with is ( With the W matrix pulled outside the integrand because it does not vary with x):

$$ W^{i} \int_{x_i}^{x_{i+1}}{}(B^T)(EA)(B)dx d^i$$

The B matrix is a function of x and is equal too:

$$ B(x) = \|\frac{-1}{L^i} \|\frac{-1}{L^i}| $$

Note: $$ L^{i} = x_{i+1} - x_i $$

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