You can specify more than one form of damping in a model. The program will formulate the damping
matrix [C] as the sum of all the specified forms of damping. For more information about damping, see
Damping Matrices in the Mechanical APDL Theory Reference
The following tables show the type of damping supported for each structural analysis type:
- Table 1.1: Damping for Full Analyses (p. 3)
- Table 1.2: Damping for Modal and Mode Superposition Analyses (p. 3)
- Table 1.3: Damping for Damped Modal and QRDAMP Mode Superposition Analyses (p. 4)
Table 1.1: Damping for Full Analyses
Damping
Ratio
Viscoelast-
ic Material
Damping
Structur-
al Damp-
ing Coef-
ficient
Constant Structural
Damping Coefficient
Element
Damp-
ing ( 1 )
Rayleigh Damping
Mode-De-
pendent
Material-
Dependent
Material-
Depend-
ent
Material-
Depend-
ent
Material- Global
Depend-
ent
Global
MP,DM- TB,PRONY TB,SDAMP MDAMP
PR
COM- DMPSTR
BIN14,
MP,BETD
and
MP,ALPD
ALPHAD
and
BETAD MAT-
RIX27,
...
Static --- --- --- --- --- --- --- ---
Buckling --- --- --- --- --- --- --- ---
Substructure Yes Yes Yes --- --- --- --- Yes ( 2 )
Generation
Full Harmon- Yes Yes Yes Yes Yes Yes Yes ---
ic
Full Transi- Yes Yes Yes --- --- No ( 3 ) --- ---
ent
- Includes superelement damping matrix.
- Supported for Component Mode Synthesis (CMS) substructuring using fixed-interface method (CM-
SOPT,FIX). See Component Mode Synthesis (CMS) for details. - In a full transient analysis, viscoelastic behavior is included in the constitutive relationship and not rep-
resented via damping.
Table 1.2: Damping for Modal and Mode Superposition Analyses
Structural
Damping
Damping Ratio
Rayleigh Damp-
ing
Global
Mode-Depend-
ent 2
Material-Depend-
Global Global ent 2
DM- MP,DMPR MDAMP DMPSTR
PRAT
ALPHAD and
BETAD
Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
Damping