Modal damping

Proportional modal damping is useful for models for which you have no knowledge of physical damping. Response Dynamics uses both hysteretic (or structural) and viscous damping in response calculations. Because the modal approach is used in Response Dynamics, you can define modal hysteretic and modal viscous damping ratios for each active normal mode. You can also define modal viscous damping ratios by using Rayleigh's damping method, a software option that calculates viscous damping for each mode.

Note:

If you want Simcenter Nastran to calculate physical damping, you must add the appropriate damping elements or material damping in your FEM or define global damping in the G parameter for the solution as described in Damping.

Look up more details

Modal hysteretic and viscous damping ratios

Equivalent viscous damping ratio

Rayleigh's damping method

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Modal damping, Simcenter 3D 2021.1 Series

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