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harmonic response in WB: asymmetric modes

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loginatnine

loginatnine

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Jul 21, 2008
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Hi and thanks for looking,

I'm having trouble exciting correctly the asymmetric modes of a simple beam (like 2nd bending, 4th bending etc.). It seems like ANSYS WB needs 2 forces out of phase of 180 degrees or of opposite magnitude to correctly excite them. But then, in that situation, the symmetric modes don't get excited! I need to get this straightened out, do I absolutely need 2 input to excite the asymmetric modes? Am I missing something here? I've included the test model!

Thanks
 
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