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Vibrating membrane

Posted Oct 28, 2015, 3:26 p.m. EDT Results & Visualization, Structural Mechanics Version 5.1 4 Replies

Aalim Mustafa
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Hi all

I went through the attached tutorial on vibrating membrane and I have one question please. in the results, it is shown that the amplitude of vibration for the first eign frequency is 4.5 meter which is too high compared to membrane diameter (0.5 meter). can you please elaborate more on this.

Thanking you,
Aalim
4 Replies Last Post Oct 29, 2015, 3:59 p.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 9 years ago Oct 28, 2015, 3:37 p.m. EDT
As you'll recall, the amplitude of an eigenmode is arbitrary. Only the shape has meaning. You can rescale it any way you want.
Best,
Jeff
As you'll recall, the amplitude of an eigenmode is arbitrary. Only the shape has meaning. You can rescale it any way you want. Best, Jeff
Aalim Mustafa
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Posted: 9 years ago Oct 28, 2015, 6:17 p.m. EDT
Thank you very much Jeff for your reply. is that means when using eign frequency study, COMSOL will only concentrate on frequencies?! Then what if I want to study vibration (transverse motion in z )of the membrane ? Do I need to select another study ?

Many thanks,
Aalim
Thank you very much Jeff for your reply. is that means when using eign frequency study, COMSOL will only concentrate on frequencies?! Then what if I want to study vibration (transverse motion in z )of the membrane ? Do I need to select another study ? Many thanks, Aalim
Henrik Sönnerlind COMSOL Employee

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Posted: 9 years ago Oct 29, 2015, 3:53 a.m. EDT
Hi,

To compute an actual response, you need and excitation (and usually appropriate damping). The relevant study type are Frequency Response (usually prestressed in the case of a membrane) or Time Dependent.

Regards,
Henrik
Hi, To compute an actual response, you need and excitation (and usually appropriate damping). The relevant study type are Frequency Response (usually prestressed in the case of a membrane) or Time Dependent. Regards, Henrik
Aalim Mustafa
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Posted: 9 years ago Oct 29, 2015, 3:59 p.m. EDT
Hi Henrik

Thank you very much for your reply! OK, I will try this studies and let you know my results!
Best regards,
Aalim
Hi Henrik Thank you very much for your reply! OK, I will try this studies and let you know my results! Best regards, Aalim

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