6 Replies Latest reply on Aug 22, 2011 11:23 AM by Reid Sorensen

'Singular Matrix' Error when attempting to solve a Frequency Study

Reid Sorensen Apr 23, 2010 2:44 PM

I am new to the simulation add-in for SolidWorks. I have been tasked with optimizing the design of a test fixture we use on a shaker table. Specifically, we want to ensure that all mode shapes of the testing assembly occur above the frequency range we sweep while testing. I have everything modeled and I believe all the proper study constraints in place. The model meshes with no problems. When run the study it starts its calculations as normal but then a few minutes later I receive an error that says, "Stop: 8 - Singular Matrix." I have tried searching for what causes a 'Singular Matrix' error but have not had any luck. Does anyone know what this means or what steps can and should be taken to avoid an error of this type? Below you'll find a screen shot of the error message I receive. Thanks for your help!

-Reid

Re: 'Singular Matrix' Error when attempting to solve a Frequency Study

Seun ADEOSUN Apr 23, 2010 3:35 PM (in response to Reid Sorensen)

Make sure that all the parts within the assembly are bonded, check for gaps between componets. If this still does not solve the problem try running it as a static problem with thesamecontraints.
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Re: 'Singular Matrix' Error when attempting to solve a Frequency Study

1-KEXUXG May 1, 2010 4:36 PM (in response to Reid Sorensen)

I had a similar message when doing a static stress analysis. I think the problem was with the mesh in some high curvature areas. I applied mesh controls in the areas of high curvature and made the mesh much denser and it solved the problem.
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Re: 'Singular Matrix' Error when attempting to solve a Frequency Study

Joe Grant May 3, 2010 9:36 AM (in response to Reid Sorensen)

To identify the problem, suppress all your components in the assembly except for the base component. I'm defining the "base component" as the one which you are rigidly constraining. Run the analysis, it should probably run with only one component represented. Un-suppress a mating component and remesh and rerun the analysis. Continue to perform this iterative process until your model crashes again. At that point in time you can zero in on the mates and or geometry of the newly unsuppressed component and trouble shoot it more effectively.
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- Re: 'Singular Matrix' Error when attempting to solve a Frequency Study
  
  Reid Sorensen May 6, 2010 10:16 AM (in response to Joe Grant)
  
  Thanks for all of your help guys. I stepped through the model piece by piece and found that I was missing a bonded constraint. Getting good results now, thanks again!
  
  -Reid
  
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  - Re: 'Singular Matrix' Error when attempting to solve a Frequency Study
    
    James Pare Aug 19, 2011 7:45 AM (in response to Reid Sorensen)
    
    Are you using harmonic testing to simulate the shaker?
    
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    - Re: 'Singular Matrix' Error when attempting to solve a Frequency Study
      
      Reid Sorensen Aug 22, 2011 11:23 AM (in response to James Pare)
      
      This was solved using the "Frequency" study. I simply looked at the resonances of the fixturing. We did not have Simulation Premium at the time it was first run.
      
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