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Complex Eigenfrequency value

Posted Jul 26, 2016, 12:59 p.m. EDT 2 Replies

Sheng Ni
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Hi everyone,

I am simulating a kind of resonator and now we want to generate the Eigenfrequency of this device. However, the Eigenfrequency that I get in the simulation is complex numbers! And I have checked that the elastic matrix is positive define matrix, which means it is impossible to generate a complex frequency. So what can I do?
2 Replies Last Post Jul 28, 2016, 3:08 p.m. EDT
Andreas Bick COMSOL Employee

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Posted: 8 years ago Jul 27, 2016, 2:49 p.m. EDT
Dear Sheng Ni,

a complex valued frequency is connected to a damping. You can find more information about that in the manual. The quality factor can be calculated from the ratio of real and imaginary part.

Regards, Andreas
Dear Sheng Ni, a complex valued frequency is connected to a damping. You can find more information about that in the manual. The quality factor can be calculated from the ratio of real and imaginary part. Regards, Andreas
Sheng Ni
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Posted: 8 years ago Jul 28, 2016, 3:08 p.m. EDT
Thank you so much!
Thank you so much!

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