Hi all
I have a problem with eigenfrequency and frequency domain, I hope someone can help me to clear I using PDE Coefficient form, and solve my problem in 2D, with independent variable (u) = scalar. With eigenfrequency, I found 1st mode = 382 (Hz), and 2nd mode ( 609Hz), 3rd mode = 817 (Hz) But problem is that when I use Frequency domain with f= 609(Hz) or 817(Hz), the result alway similar to 1st mode frequency Please see my
I using PDE Coefficient form, and solve my problem in 2D, with independent variable (u) = scalar. With eigenfrequency, I found 1st mode = 382 (Hz), and 2nd mode ( 609Hz), 3rd mode = 817 (Hz) But problem is that when I use Frequency domain with f= 609(Hz) or 817(Hz), the result alway similar to 1st mode frequency Please see my
But problem is that when I use Frequency domain with f= 609(Hz) or 817(Hz), the result alway similar to 1st mode frequency Please see my attached file
Dear Nhan, try to verify if using Frequency Domain, Comsol introduces some damping parameters which PDE Coeffs method doesn't use. Gianluca
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