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### Highlights fromModeling Flexible Bodies in SimMechanics

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# Modeling Flexible Bodies in SimMechanics

08 May 2006 (Updated 06 Oct 2009)

Technical paper and examples on modeling flexibility in SimMechanics.

### Editor's Notes:

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Description

This archive contains a technical paper on modeling flexible bodies using SimMechanics and Simulink. The archive also includes the examples discussed in the technical paper.

An overview of the techniques described here is presented in the following MATLAB Digest article:

Acknowledgements

Modeling Flexible Bodies In Sim Mechanics inspired this file.

This file inspired Modeling Flexible Bodies In Sim Mechanics.

Required Products SimMechanics
MATLAB release MATLAB 7.2 (R2006a)
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24 Feb 2012

Question: I have a working implementation of flexbodies in Simmechanics. For this I used a classic, free-free state-space model, exported from Ansys. To get the results to closely match FEM output however, I require about 200 modes, which takes a long time to run. In trying to improve this, I have been looking at different techniques to create state-space systems, e.g. the free Craig-Bampton reduction approach. Does anyone have experience with this, or other advice relevant to improve calculation times and/or accuracy?

22 Aug 2011

Hi there. I am trying to construct a composite beam by copying the given beam model, and then connecting the midpoint. I cannot figure out how to do this. Do you maybe have examples of where you have connected several flexible bodies?

26 Apr 2010

When I try to model a beam along certain directions some plot errors occur. For example when I try to plot a beam which "Direction of the beam element" is [1 1 0], Matlab answers: MATLAB error message: Error using ==> axis>LocSetLimits at 234
Vector must have 4, 6, or 8 elements.

02 Sep 2008
05 Jul 2008

i am give the refrance only for my tutorial

05 Jul 2008
05 Nov 2007
09 Jul 2007

there is a problem with:
"??? Error using ==> cd
Cannot CD to /home/vchudnov/Playground/SimMechanics/FlexibleBodies/Paper/MLNN2006Q1/CaseStudy/paper/data (Name is nonexistent or not a directory)."
Sicerely

23 Nov 2006
31 May 2006

There are many problems with this archive file and the files it contains.
Above all, the only .mat file provided, i.e. ss_cantilever_pva.mat, is corrupted, making the testing and understanding of the example described impossible.

30 May 2006

Is it possible to have the data files provided by cosmos and used as input in cosmos2m?

24 May 2006

The archive seems to be an invalid ZIP file.

22 May 2006

When try to unzip, got two bad CRC "8f061a29 (should be 3edde5fb)" and "487d514a (should be df7ebeed)".

18 May 2006
10 May 2006

Editorial corrections to the technical paper.

11 May 2006

Edit keywords.

11 May 2006

Fixed URL

11 May 2006

Include needed library file

23 May 2006

Resubmited archive to fix CRC errors in .zip file.

24 May 2006

Fix recent .zip file error. Sorry for the recurring archive problems! Please post or email any problems, and check back frequently for updates. Thanks!

26 May 2006

Added to the description a link to the MATLAB Digest overview article.

31 Aug 2006

Corrected typo in the Omega matrix. Added a section on the limitations of and corrections to the lumped-parameter method.

31 Aug 2006

01 Sep 2006