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implement exp finite rotations update rule for frame co-rotational #117

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jorgepz opened this issue Jul 25, 2020 · 4 comments
Open
2 tasks done

implement exp finite rotations update rule for frame co-rotational #117

jorgepz opened this issue Jul 25, 2020 · 4 comments
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enhancement New feature or request help wanted Extra attention is needed someday strange This doesn't seem right
Milestone
v0.4.0

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@jorgepz
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jorgepz commented Jul 25, 2020 •
edited

  • correct errors when using exponential update
  • validate using some example
@jorgepz jorgepz added the strange This doesn't seem right label Jul 25, 2020
@jorgepz jorgepz added this to the version 0.2.0 milestone Jul 25, 2020
@mvanzulli
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untitled
Beam 2 helicodal

@mvanzulli
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mvanzulli commented Nov 21, 2020 •
edited

image

This extract is from Battini etal 2013:https://pdfs.semanticscholar.org/58b3/7b80a3d951cf88cf7d8c4c586db885f4d3b3.pdf

The update using material angles, in ONSAS nomenclature named as tg1 and tg2, dont require to implement spatial update. However the operator logar becomes singular with tg = 2pi. This is a limitant to consider when elements can rotate more than a round

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This rules for updating angles were deleted at: #648

@mvanzulli mvanzulli mentioned this issue Apr 6, 2023
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@jorgepz jorgepz changed the title review errors in finite rotations update rules implement exp finite rotations update rule for frame co-rotational Apr 6, 2023
@jorgepz jorgepz reopened this Apr 6, 2023
@jorgepz jorgepz modified the milestones: version 0.2.0, v0.4.0 Apr 6, 2023
@mvanzulli
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mvanzulli commented Apr 6, 2023 •
edited

We have tried with:

  updateA = antiSkew( logm( expm( skew( deltauComplete ( nodeAngDofs ) ) ) * ...
                                          %~ expm( skew( Uk             ( nodeAngDofs ) ) ) ...
                                        %~ ) ) ;
     updateB = deltauComplete ( nodeAngDofs ) + Uk             ( nodeAngDofs ) ;
     updateC = logar( expon( deltauComplete ( nodeAngDofs ) ) * ...
                                %~ expon( Uk             ( nodeAngDofs ) ) ) ;

@jorgepz jorgepz added enhancement New feature or request help wanted Extra attention is needed someday labels Apr 6, 2023
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enhancement New feature or request help wanted Extra attention is needed someday strange This doesn't seem right
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