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Vibration analysis of large assemblies

Vibration analysis of large assemblies

Vibration analysis of large assemblies

(OP)
I am looking for some tips on which commercial FEA product can effectively handle shock and vibration analysis of very large electronics chassis assemblies like communications equipment rack loaded with circuit boards, fans, etc.

Thanks!  

 
 

RE: Vibration analysis of large assemblies

I think they all can, it comes down to how you mesh and useing shells instead of solids.  For vib, are you looking for mode shapes and Fn?  For shock, you have to do your G calculations from the pulse and simply add a static gravity.

Tobalcane
"If you avoid failure, you also avoid success."  

RE: Vibration analysis of large assemblies

Most commercial FE codes will do the job. The challenge is to model the PCB's correctly. That is much more than defining Glass Fibre Properites, density and thickness. The componenets on the PCB will shift both stiffness and mass distribution. Do a quick shaking of the PDB and find the fundamental natural frequencies. Tune your FE model of the PCB to fit your test and include the model of the tuned PCB into your System model.

RE: Vibration analysis of large assemblies

(OP)
How about pre-procesors and their ability to de-feature and clean up large assemblies and mesh?  Any recommendations on products like FEMAP, Patran, DesignModeler, SpaceClaim?

Thanks.

RE: Vibration analysis of large assemblies

De-feature in your CAD environment, not in the preprocessor.

Cheers

Greg Locock

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