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Eigenfrequency Problem

Posted Mar 12, 2013, 8:49 a.m. EDT Studies & Solvers, Structural Mechanics Version 4.0, Version 4.0a, Version 4.1, Version 4.2, Version 4.2a, Version 4.3, Version 4.3a 2 Replies

Victor Soares
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Good evening,


I'd like to know if there's a way to find the highest, maximum , eigerfrequency of a structure using COMSOL.
2 Replies Last Post Mar 13, 2013, 4:34 p.m. EDT
Edgar Kaiser
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Posted: 1 decade ago Mar 12, 2013, 10:08 a.m. EDT
Victor,

there is no such thing as a highest eigenfrequency in a mechanical structure, or even any structure that has eigenmodes. The high frequency modes may suffer from strong damping and you must define your criterion for the quality factor of the mode according to your model.

However, there is a lowest eigenfrequency and COMSOL can find it in a eigenmode study.

Cheers
Edgar
Victor, there is no such thing as a highest eigenfrequency in a mechanical structure, or even any structure that has eigenmodes. The high frequency modes may suffer from strong damping and you must define your criterion for the quality factor of the mode according to your model. However, there is a lowest eigenfrequency and COMSOL can find it in a eigenmode study. Cheers Edgar
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago Mar 13, 2013, 4:34 p.m. EDT
Victor,

As Edgar pointed out there is no such thing. There is a highest natural frequency for a specific finite element mesh but I doubt that would be useful to you. Such a frequency can be used to determine the maximum stable time step in an explicit analysis.

Nagi Elabbasi
Veryst Engineering
Victor, As Edgar pointed out there is no such thing. There is a highest natural frequency for a specific finite element mesh but I doubt that would be useful to you. Such a frequency can be used to determine the maximum stable time step in an explicit analysis. Nagi Elabbasi Veryst Engineering

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