dmprat

DynamicOptions.dmprat(ratio='', **kwargs)

Sets a modal damping ratio.

Mechanical APDL Command: DMPRAT

Command default:

Use damping as defined by Damping

Parameters:

ratiostr

Modal damping ratio (for example, 2% is input as 0.02).

Notes

Sets a damping ratio for use in a mode-superposition transient analysis ( antype,TRANS with trnopt,MSUP), a mode-superposition harmonic analysis ( antype,HARMIC with hropt,MSUP) analysis, or a spectrum ( antype,SPECTR) analysis.

dmprat can also be defined in a substructure analysis that uses component mode synthesis. The damping ratio is added on the diagonal of the reduced damping matrix, as explained in Component Mode Synthesis (CMS)

This command is also valid in PREP7.

Additional Information

Damping Matrices