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Does not add load to mass in frequency analysis

Does not add load to mass in frequency analysis

Does not add load to mass in frequency analysis

(OP)
Hi,
I will do frequency analysis on abaqus, but I have external loads. I define these before the frequency as static general Nonlinear on. I cannot see its effect on the mass. Loads are not included in the mass. How can I include loads in the total mass?
Thank you.

RE: Does not add load to mass in frequency analysis

Preloads affect natural frequencies but not through a significant change in mass - it's because of stress stiffening/softening effects.

RE: Does not add load to mass in frequency analysis

(OP)
Thank you for your return.

RE: Does not add load to mass in frequency analysis

We are talking about preloaded modal analyses here - those that are preceded by a nonlinear static analysis and then the stress stiffening/softening effects can be considered during the natural frequency extraction.

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