*SUBSTRUCTURE DAMPING

Specify mass proportional and stiffness proportional damping for a substructure.

This option is used to specify substructure damping factors proportional to the substructure mass and stiffness matrices at the substructure usage stage. The mass and stiffness proportional damping factors can be used in combination with the generated substructure viscous and structural damping matrices and substructure modal damping to form the substructure element damping matrix at the substructure usage stage.

The SUBSTRUCTURE DAMPING option can be used only in conjunction with the SUBSTRUCTURE PROPERTY option. This option is supported in procedures where nondiagonal damping is allowed in the model domain, such as general analysis procedures, linear dynamic procedures, and the direct steady-state dynamics procedure.

This page discusses:

Optional parameters
There are no data lines associated with this option.

Optional parameters

ALPHA: Set this parameter equal to the $α_{R}$ coefficient to create Rayleigh mass proportional damping. The default is ALPHA=0. (Units of T⁻¹.)
BETA: Set this parameter equal to the $β_{R}$ coefficient to create Rayleigh stiffness proportional damping. The default is BETA=0. (Units of T.)
STRUCTURAL: Set this parameter equal to the $γ$ coefficient to create imaginary stiffness proportional damping. The default is STRUCTURAL=0.

There are no data lines associated with this option.