frequency sweep with comsol
Hi, I have started using comsol recently and I have a problem about the frequency response analysis. Which relationship should I add to the boundray settings of my geometry so that I could get a...
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Hi typically an external load, such as an external Boundary force for a structural case, you give an amplitude and the solver considers this amplitude as oscillating at the frequency "freq" -- Good...
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Hi, Can I ask you another question? I am confused of resonance frequencies and the eigenfrequencies. I thought they were referred to the same thing. Are they? If they are the same thing then why for a...
View ArticleRe: frequency sweep with comsol
Hi I agree in 1D two spring masses attached rigidly at one end should give two modes only, (twist modes excluded) but in 2D or 3D you should see a few more for the different directions and new DoFs in...
View ArticleRe: frequency sweep with comsol
Hi Ivar, Thank you very much!! But if I make a frequency response analysis, the value I get is different with the eigenfrequency analysis, so I guess the frequency response is the solution for 1D? Is...
View ArticleRe: frequency sweep with comsol
Hi An eigenfrequency analysis is taking a model, stripping external forces/loads, linearising the model and searching for the eigenmodes of the equation sets A frequency response is obtained by...
View ArticleRe: frequency sweep with comsol
Hi, Can I ask you another question? I am confused of resonance frequencies and the eigenfrequencies. I thought they were referred to the same thing. Are they? If they are the same thing then why for a...
View ArticleRe: frequency sweep with comsol
Hi I agree that there is much more to say here, but normally one consider eigenmodes as fundamental entities independently of their way of excitation. When you excite with a sinus you enter the energy...
View ArticleRe: frequency sweep with comsol
Hi Ivar, Thanks again for the replies. Again I have another question about the frequency response analysis. I make a plot of the phase of a certain point in my structure and use the postprocessing...
View ArticleRe: frequency sweep with comsol
Hi what (which physical properties) is governing the phase "smoothness" ? In my way of expression the phase "domain" is the loss "domain", if you add some losses i.e. some Rayleigh or general type...
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Hi, I am a little confused of what you said about the " phase domain" related to the loss domain. I thought the phase domain related to the passive element of my circuit like C, L in electrical domain...
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Hi sorry to go too quick (I'm stuck in a structural frequency sweep model just now so I'm biased) the smooth "round" phase transitions will appear if you add some structural damping in your MEMS module...
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Hi, resurrecting a dead thread. You mention applying an external boundary force to produce a frequency domain. How would this apply to a periodic structure? Would comsol replicate the force along the...
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Hi ivar and others, I have simulated a mems capacitive accelerometer. Now I want to find its cross axis sensitivity (how much it will displace in other direction when it is accelerated in one...
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