Talk:Degrees of freedom (mechanics): Difference between revisions
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== Untitled == |
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A typical Backhoe, for example, has 3 degrees of freedom. <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/24.151.97.146|24.151.97.146]] ([[User talk:24.151.97.146#top|talk]]) 22:00, 4 August 2006 UTC</small> |
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== Uniq Abbreviation == |
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Article contains '''''DoF''''' and '''''DOF'''''. |
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should be aligned, but this is will end up in an philiosphical discussion... <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/91.56.34.7|91.56.34.7]] ([[User talk:91.56.34.7#top|talk]]) 08:16, 11 January 2019 (UTC)</small> <!--Autosigned by SineBot--> |
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A typical Backhoe, for example, has 3 degrees of freedom. |
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== Rename to "mechanics" == |
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The word "engineering" is too diffuse here. The title should be Degrees of Freedom (mechanics). For example, the reference to the Elec Engg concept of Antenna DOFs is perhaps more appropriate in the DOF(physics) discussion than here. <!-- Template:Unsigned --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Mukerjee|Mukerjee]] ([[User talk:Mukerjee#top|talk]] • [[Special:Contributions/Mukerjee|contribs]]) 10:02, 13 November 2006 (UTC)</small> |
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The word "engineering" is too diffuse here. The title should be |
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Degrees of Freedom (mechanics). For example, the reference to the |
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Elec Engg concept of Antenna DOFs is perhaps more appropriate |
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in the DOF(physics) discussion than here. |
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:what about 'statics'? --[[User:Leladax|Leladax]] ([[User talk:Leladax|talk]]) 11:39, 8 February 2008 (UTC) |
:what about 'statics'? --[[User:Leladax|Leladax]] ([[User talk:Leladax|talk]]) 11:39, 8 February 2008 (UTC) |
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::Probably not statics since d.o.f. implies motion. Also statics and dynamics are generally associated with engineering mechanics. Keeping it as "mechanics" is probably a more appropriate choice. [[User:Jamesontai|'''''< |
::Probably not statics since d.o.f. implies motion. Also statics and dynamics are generally associated with engineering mechanics. Keeping it as "mechanics" is probably a more appropriate choice. [[User:Jamesontai|'''''<span style="color:#000066;">- Jameson L. Tai</span>''''']] <sup style="color:#660000;">''[[User talk:Jamesontai|<span style="color:#660000;">talk</span>]] ♦ [[User:Jamesontai/Autograph_Book|<span style="color:#660000;">guestbook</span>]] ♦ [[Special:Contributions/Jamesontai|<span style="color:#660000;">contribs</span>]]''</sup> 07:51, 4 February 2009 (UTC) |
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===Rename to "motion"=== |
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The degrees of freedom in this context refer to motion, so should be renamed in this way. A 2D motion has two degrees of freedom for example like a land vehicle and aircraft has 3 degrees of freedom. --[[Special:Contributions/89.122.167.251|89.122.167.251]] ([[User talk:89.122.167.251|talk]]) 12:32, 5 April 2011 (UTC) |
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* '''Oppose''' See [[WP:COMMONNAME]]. "Degrees of freedom" is the term in common use. Note that rotations also count as freedoms, so aerobatic aircraft have ''six'' degrees of freedom, not three. [[User:Andy Dingley|Andy Dingley]] ([[User talk:Andy Dingley|talk]]) 12:50, 5 April 2011 (UTC) |
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* Degrees of freedom of course, but ''{motion)'' should be a disambiguation paranthesis. The free degrees of freedom are probably refering to translation, not rotation.--[[Special:Contributions/188.26.22.131|188.26.22.131]] ([[User talk:188.26.22.131|talk]]) 15:39, 5 April 2011 (UTC) |
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I think it would be highly beneficial to include a more applied example to this article (or wherever is most appropriate) - something like http://www.robotics.utexas.edu/rrg/learn_more/low_ed/dof/ - or at the very least, link to such a resource in the external links. <small>—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/91.104.137.129|91.104.137.129]] ([[User talk:91.104.137.129|talk]]) 22:41, 25 April 2008 (UTC)</small><!-- Template:UnsignedIP --> <!--Autosigned by SineBot--> |
I think it would be highly beneficial to include a more applied example to this article (or wherever is most appropriate) - something like http://www.robotics.utexas.edu/rrg/learn_more/low_ed/dof/ - or at the very least, link to such a resource in the external links. <small>—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/91.104.137.129|91.104.137.129]] ([[User talk:91.104.137.129|talk]]) 22:41, 25 April 2008 (UTC)</small><!-- Template:UnsignedIP --> <!--Autosigned by SineBot--> |
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Agreed, I can imagine the current picture being quite confusing for the average joe. [[Special:Contributions/78.82.140.122|78.82.140.122]] ([[User talk:78.82.140.122|talk]]) 00:50, 16 July 2009 (UTC) |
:Agreed, I can imagine the current picture being quite confusing for the average joe. [[Special:Contributions/78.82.140.122|78.82.140.122]] ([[User talk:78.82.140.122|talk]]) 00:50, 16 July 2009 (UTC) |
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==Image== |
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== Proposed revisions == |
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Degrees of freedom of a mechanical system is the number of parameters that prescribes its configuration. It is also the dimension of its configuration space. If the mechanical system consists only of holonomic constraints, such as a system of articulated links that forms a linkage or robot, then the degrees of freedom is defined by the mobility formula. Discussion of these topics should be a useful addition to this article. [[User:Prof McCarthy|Prof McCarthy]] ([[User talk:Prof McCarthy|talk]]) 17:26, 2 January 2012 (UTC) |
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:I increased the importance because it is difficult to talk about robotic systems without considering their degrees of freedom. Also while still in the beginning this article does not seem to be a stub any longer. [[User:Prof McCarthy|Prof McCarthy]] ([[User talk:Prof McCarthy|talk]]) 06:47, 13 January 2012 (UTC) |
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== Typo? == |
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Is there a typo in: |
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:"There are two important special cases: (i) a simple open chain, and (ii) a simple closed chain. A single open chain consists of" |
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Shouldn't it be "simple" instead of "single"? -- [[User:Obradovic Goran|Obradović Goran ]] [[User talk:Obradovic Goran|(<span style="color:red;">t</span><span style="color:blue;">a<sup>l</sup></span><span style="color:gray;">k</span>]] 16:13, 4 November 2012 (UTC) |
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:It depends, I suppose, on whether simple is always single. The simple open chain must have only a single branch, and the simple closed chain must only have a single loop. If this is true, then I agree with simple. [[User:Prof McCarthy|Prof McCarthy]] ([[User talk:Prof McCarthy|talk]]) 16:59, 4 November 2012 (UTC) |
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== Math notation cleanup == |
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The non-[[TeX]] math notation in this article was done with great ineptitude. Lots of things like |
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: ''c-f+1'' |
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instead of |
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: ''c'' − ''f'' + 1 |
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and ''n'' x ''n'' instead of ''n'' × ''n'', etc. |
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: |
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[[WP:MOSMATH]] exists. So do standard conventions in the world outside Wikipedia. Note that in non-TeX notation |
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* Variables should be italicized but digits, parentheses, etc., should not, nor things like det, log, sin, max, etc. |
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* Spaces precede and follow things like "+", "−", "=", etc. |
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* A minus sign is not a stubby little hyphen. |
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* This is all codified in [[WP:MOSMATH]]. |
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* This matches the style used in TeX, LaTeX, MathJax, etc. |
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[[User:Michael Hardy|Michael Hardy]] ([[User talk:Michael Hardy|talk]]) 16:38, 27 March 2014 (UTC) |
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==Mention conflict with Degrees Of Freedom (Physics and Chemistry)== |
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The definition in this article conflicts with the current Wikipedia aritcle https://en.wikipedia.org/wiki/Degrees_of_freedom_%28physics_and_chemistry%29 where the "degrees fo freedom" are the state variables themselves rather than the cardinality of the set of state variables. It would be useful to mention the ambiguous use of the term "degrees of freedom" in the physical sciences. [[User:Tashiro|Tashiro]] ([[User talk:Tashiro|talk]]) 17:36, 26 January 2015 (UTC) |
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==Broken link== |
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Reference 2, Summary of ship movement, is no longer available. <small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/187.139.245.222|187.139.245.222]] ([[User talk:187.139.245.222|talk]]) 16:53, 23 March 2016 (UTC)</small><!-- Template:Unsigned IP --> <!--Autosigned by SineBot--> |
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== External links modified == |
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Hello fellow Wikipedians, |
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I have just added archive links to {{plural:1|one external link|1 external links}} on [[Degrees of freedom (mechanics)]]. Please take a moment to review [https://en.wikipedia.org/enwiki/w/index.php?diff=prev&oldid=711653978 my edit]. If necessary, add {{tlx|cbignore}} after the link to keep me from modifying it. Alternatively, you can add {{tlx|nobots|deny{{=}}InternetArchiveBot}} to keep me off the page altogether. I made the following changes: |
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*Added archive http://web.archive.org/web/20111125015923/http://www.pomorci.com:80/Zanimljivosti/Ship's%20movements%20at%20sea.pdf to http://www.pomorci.com/Zanimljivosti/Ship's%20movements%20at%20sea.pdf |
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Cheers.—[[User:Cyberbot II|<sup style="color:green;font-family:Courier">cyberbot II</sup>]]<small><sub style="margin-left:-14.9ex;color:green;font-family:Comic Sans MS">[[User talk:Cyberbot II|<span style="color:green">Talk to my owner</span>]]:Online</sub></small> 02:49, 24 March 2016 (UTC) |
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@ [[Special:Contributions/95.85.100.176|95.85.100.176]] ([[User talk:95.85.100.176|talk]]) 17:58, 18 April 2024 (UTC) |
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:''Italic'' [[Special:Contributions/95.85.100.176|95.85.100.176]] ([[User talk:95.85.100.176|talk]]) 18:00, 18 April 2024 (UTC) |
Latest revision as of 18:00, 18 April 2024
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Untitled
[edit]A typical Backhoe, for example, has 3 degrees of freedom. — Preceding unsigned comment added by 24.151.97.146 (talk) 22:00, 4 August 2006 UTC
Uniq Abbreviation
[edit]Article contains DoF and DOF.
should be aligned, but this is will end up in an philiosphical discussion... — Preceding unsigned comment added by 91.56.34.7 (talk) 08:16, 11 January 2019 (UTC)
Rename to "mechanics"
[edit]The word "engineering" is too diffuse here. The title should be Degrees of Freedom (mechanics). For example, the reference to the Elec Engg concept of Antenna DOFs is perhaps more appropriate in the DOF(physics) discussion than here. — Preceding unsigned comment added by Mukerjee (talk • contribs) 10:02, 13 November 2006 (UTC)
- what about 'statics'? --Leladax (talk) 11:39, 8 February 2008 (UTC)
- Probably not statics since d.o.f. implies motion. Also statics and dynamics are generally associated with engineering mechanics. Keeping it as "mechanics" is probably a more appropriate choice. - Jameson L. Tai talk ♦ guestbook ♦ contribs 07:51, 4 February 2009 (UTC)
Rename to "motion"
[edit]The degrees of freedom in this context refer to motion, so should be renamed in this way. A 2D motion has two degrees of freedom for example like a land vehicle and aircraft has 3 degrees of freedom. --89.122.167.251 (talk) 12:32, 5 April 2011 (UTC)
- Oppose See WP:COMMONNAME. "Degrees of freedom" is the term in common use. Note that rotations also count as freedoms, so aerobatic aircraft have six degrees of freedom, not three. Andy Dingley (talk) 12:50, 5 April 2011 (UTC)
- Degrees of freedom of course, but {motion) should be a disambiguation paranthesis. The free degrees of freedom are probably refering to translation, not rotation.--188.26.22.131 (talk) 15:39, 5 April 2011 (UTC)
Examples of Degrees of Freedom in Robotics
[edit]I think it would be highly beneficial to include a more applied example to this article (or wherever is most appropriate) - something like http://www.robotics.utexas.edu/rrg/learn_more/low_ed/dof/ - or at the very least, link to such a resource in the external links. —Preceding unsigned comment added by 91.104.137.129 (talk) 22:41, 25 April 2008 (UTC)
- Agreed, I can imagine the current picture being quite confusing for the average joe. 78.82.140.122 (talk) 00:50, 16 July 2009 (UTC)
Image
[edit]The image Robot arm model 1.png is missing. Bloody Viking (talk) 15:28, 2 November 2010 (UTC)
Proposed revisions
[edit]Degrees of freedom of a mechanical system is the number of parameters that prescribes its configuration. It is also the dimension of its configuration space. If the mechanical system consists only of holonomic constraints, such as a system of articulated links that forms a linkage or robot, then the degrees of freedom is defined by the mobility formula. Discussion of these topics should be a useful addition to this article. Prof McCarthy (talk) 17:26, 2 January 2012 (UTC)
- I increased the importance because it is difficult to talk about robotic systems without considering their degrees of freedom. Also while still in the beginning this article does not seem to be a stub any longer. Prof McCarthy (talk) 06:47, 13 January 2012 (UTC)
Typo?
[edit]Is there a typo in:
- "There are two important special cases: (i) a simple open chain, and (ii) a simple closed chain. A single open chain consists of"
Shouldn't it be "simple" instead of "single"? -- Obradović Goran (talk 16:13, 4 November 2012 (UTC)
- It depends, I suppose, on whether simple is always single. The simple open chain must have only a single branch, and the simple closed chain must only have a single loop. If this is true, then I agree with simple. Prof McCarthy (talk) 16:59, 4 November 2012 (UTC)
Math notation cleanup
[edit]The non-TeX math notation in this article was done with great ineptitude. Lots of things like
- c-f+1
instead of
- c − f + 1
and n x n instead of n × n, etc.
WP:MOSMATH exists. So do standard conventions in the world outside Wikipedia. Note that in non-TeX notation
- Variables should be italicized but digits, parentheses, etc., should not, nor things like det, log, sin, max, etc.
- Spaces precede and follow things like "+", "−", "=", etc.
- A minus sign is not a stubby little hyphen.
- This is all codified in WP:MOSMATH.
- This matches the style used in TeX, LaTeX, MathJax, etc.
Michael Hardy (talk) 16:38, 27 March 2014 (UTC)
Mention conflict with Degrees Of Freedom (Physics and Chemistry)
[edit]The definition in this article conflicts with the current Wikipedia aritcle https://en.wikipedia.org/wiki/Degrees_of_freedom_%28physics_and_chemistry%29 where the "degrees fo freedom" are the state variables themselves rather than the cardinality of the set of state variables. It would be useful to mention the ambiguous use of the term "degrees of freedom" in the physical sciences. Tashiro (talk) 17:36, 26 January 2015 (UTC)
Broken link
[edit]Reference 2, Summary of ship movement, is no longer available. — Preceding unsigned comment added by 187.139.245.222 (talk) 16:53, 23 March 2016 (UTC)
External links modified
[edit]Hello fellow Wikipedians,
I have just added archive links to one external link on Degrees of freedom (mechanics). Please take a moment to review my edit. If necessary, add {{cbignore}}
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- Added archive http://web.archive.org/web/20111125015923/http://www.pomorci.com:80/Zanimljivosti/Ship's%20movements%20at%20sea.pdf to http://www.pomorci.com/Zanimljivosti/Ship's%20movements%20at%20sea.pdf
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@ 95.85.100.176 (talk) 17:58, 18 April 2024 (UTC)
- Italic 95.85.100.176 (talk) 18:00, 18 April 2024 (UTC)