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Natural frequency Disappearing. need help

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I was doing modal analysis of PCB board . I have done for full model, half model and quarter model. But some of the natural frequencies in the full model is disappearing in the half model and some more in quarter model.

Is there any article regarding this subject?

Any reasons available?
Will this affect for my analysis?

Regards,
Jayesh S

1 Reply Last Post 20 févr. 2014, 10:01 UTC−5
Edgar J. Kaiser Certified Consultant

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Posted: 1 decade ago 20 févr. 2014, 10:01 UTC−5
Jayesh,

the modes of the model may not share the symmetries of the geometry.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Jayesh, the modes of the model may not share the symmetries of the geometry. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com

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