Damping

In LS-DYNA, damping entities define damping applied on the parts and nodes in case of *DAMPING_GLOBAL. In Radioss, damping entities used to set Rayleigh mass and stiffness damping coefficients are applied to a set of nodes used to stabilize the results.

LS-DYNA Cards

Card	Description
*DAMPING_FREQUENCY_RANGE	Provides approximately constant damping over a range of frequencies and applies damping to global motion.
*DAMPING_FREQUENCY_RANGE_DEFORM	Provides approximately constant damping over a range of frequencies and applies damping to element deformation.
*DAMPING_GLOBAL	Define mass weighted nodal damping that applies globally to the nodes of deformable bodies and to the mass center of the rigid bodies.
*DAMPING_PART_MASS	Define mass weighted damping by part ID.
*DAMPING_PART_MASS_SET	Define mass weighted damping by part set ID.
*DAMPING_PART_STIFFNESS	Assign Rayleigh stiffness damping coefficient by part ID.
*DAMPING_PART_STIFFNESS_SET	Assign Rayleigh stiffness damping coefficient by part set ID.
*DAMPING_RELATIVE	Apply damping relative to the motion of a rigid body.

Radioss Cards

Card	Description
/DAMP	Define the Rayleigh mass and stiffness damping coefficients applied to a set of nodes.
/DAMP/INTER	Apply Rayleigh damping to the nodes inside of specified contact to increase its stability and reduce results scattering due to small variations of initial or boundary conditions.