modal excitation factor for rotational degrees of

06-Referencing and license issues
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ag110
Posts: 9
Joined: 13 Apr 2011, 07:57

modal excitation factor for rotational degrees of

Post by ag110 »

Dear colleague

Would you please inform me what is your reference for calculating modal excitation factor for rotational degrees of freedom? and if you have simple example I appreciate if you share it.

Best Regards
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z.gronti
Posts: 660
Joined: 16 Oct 2013, 08:14

Re: modal excitation factor for rotational degrees of

Post by z.gronti »

Dear ag110,
The modal excitation factor is calculated through the type Ln=(Ön)T*M, where M is the mass and (Ön)T the traspose vector of the mode shape. You may find examples in any good textbook on Structural Dynamics.
Zoi Gronti
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ag110
Posts: 9
Joined: 13 Apr 2011, 07:57

Re: modal excitation factor for rotational degrees of

Post by ag110 »

thanks for your reply
but my problem is calculating modal excitation factor for rotational degrees of freedom when lumped mass is used in the model.
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