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resonator displacement
Posted Aug 11, 2014, 11:10 a.m. EDT 1 Reply
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Hi,
I want to simulate a mems device with comsol. I have a question about the displacement. In the 'Normal modes of a biased resonator--2D' model and ‘Frequency response of a biased resonator--2D’ model in MEMS module, for the same point, the displacement obtained from eigenfrequency study is different with that obtained form frequency domain. Why?
Another problem is the difference between 'linear elastic dielectric' and linear elastic material.
Thanks very much.
Best regards
I want to simulate a mems device with comsol. I have a question about the displacement. In the 'Normal modes of a biased resonator--2D' model and ‘Frequency response of a biased resonator--2D’ model in MEMS module, for the same point, the displacement obtained from eigenfrequency study is different with that obtained form frequency domain. Why?
Another problem is the difference between 'linear elastic dielectric' and linear elastic material.
Thanks very much.
Best regards
1 Reply Last Post Aug 13, 2014, 8:27 a.m. EDT
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Posted:
1 decade ago
Eigenfrequency analysis gives you the eigenfrequencies and their respective eigenmodes. I do not know how the amplitudes are chosen in the eigenmodes that COMSOL calculates, but I use them only to find relative amplitudes between different parts of my geometry for that particular eigenmode. Only in frequency analysis is damping and the actual driving force taken into account properly to find the actual amplitude at all frequencies.