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September 26, 2011 5:45am UTC

[COMSOL] Cantilever Beam help

Hi everyone,

I've just started to use COMSOL for the study of a simple cantilever beam and I'm facing some problems while calculating the eigenfrequencies and the frequency-response.

I use the 3D MEMS Module>Solid, Stress-Strain. I create a 22e-6,12e-6,8000e-10 box. From the Sub-domain menu in Physics I select the default settings for Silicon and from the boundary settings I'm fixing the face 1. In properties I select "large deformation" and "eigenfrequency".

Then I let COMSOL solve the problem, and here appears the first issue : I get an apparently good resonant frequency (17Khz) but the z displacement give 12m!!! Why ??? Is it due to the fact that air damping is not included or something like this ?


As I'm a beginner I have a lot of other question, but for the moment I really need help on those specific issues...

Thanks...

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