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Inertia force with an eigenmode-shaped acceleration distribution

Posted Oct 24, 2019, 5:55 a.m. EDT Structural & Acoustics, General, Acoustics & Vibrations Version 5.4 2 Replies

Elia Sironi
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Hi all, Is it possibile to insert an inertia force (maybe using the gravity load type) with an acceleration distribution taken from an eigenmode of an eigenfrequency analysis?

The problem is to give a value of the acceleration which is not constant but variable in space (x,y,z). The variation should be equal to a displacement distribution of an eigenmode.

In other words is it possibile to obtain the analytical displacement function of an eigenmode? (knownig that it represents diplacements ratios and not absolute values).

Hope to be sufficiently clear Thank you in advanced, Best regards

2 Replies Last Post Oct 28, 2019, 11:02 a.m. EDT
Henrik Sönnerlind COMSOL Employee

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Posted: 5 years ago Oct 24, 2019, 11:17 a.m. EDT

Hi,

You can do that using the withsol() operator. In the Gravity node, type something like

withsol('sol1',w,setind(lambda,1))

Here 'sol1' is the tag for your eigenfrequnecy solution. '1' means the first eigenmode.

Regards,
Henrik

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Henrik Sönnerlind
COMSOL
Hi, You can do that using the withsol() operator. In the Gravity node, type something like withsol('sol1',w,setind(lambda,1)) Here 'sol1' is the tag for your eigenfrequnecy solution. '1' means the first eigenmode. Regards, Henrik
Elia Sironi
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Posted: 5 years ago Oct 28, 2019, 11:02 a.m. EDT

Hi Henrik, Thank you very much, it works. Best regards Elia

Hi Henrik, Thank you very much, it works. Best regards Elia

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