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Eigenfrequency Problem

Posted 2013年3月12日 GMT-4 08:49 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 2013年3月13日 GMT-4 16:34
Edgar Kaiser
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Posted: 1 decade ago 2013年3月12日 GMT-4 10:08
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 2013年3月13日 GMT-4 16:34
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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