*MODAL DAMPING
Keywords: ccx

Next: *MODAL DYNAMIC Up: Input deck format Previous: *MATERIAL Contents

##
*MODAL DAMPING

Keyword type: step

This card is used within a step in which the *MODAL DYNAMIC or *STEADY STATE DYNAMICS procedure has been selected. It allows for Raleigh damping in a global way, i.e. the damping matrix is taken to be a linear combination of the stiffness matrix and the mass matrix :

| (78)

The coefficients apply to all modes. The corresponding friction coefficient for mode j amounts to:

| (79)

Consequently, damps the low frequencies, damps the high frequencies.

First line:

- *MODAL DAMPING

Second line:

- not used (kept for compatibility reasons with ABAQUS)
- not used (kept for compatibility reasons with ABAQUS)
- Coefficient of the mass matrix .
- Coefficient of the stiffness matrix .

    Example:

    *MODAL DAMPING
    ,,0.,2.e-4

indicates that the damping matrix is obtained by multiplying the stiffness matrix with

Example files: beamdy3, beamdy4, beamdy5, beamdy6.

Next: *MODAL DYNAMIC Up: Input deck format Previous: *MATERIAL Contents