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PARAM, G

PARAM, G

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PARAM, G

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Parameter

Values

Description

G

<Real>

Default = 0.0

G specifies the uniform structural damping coefficient in the formulation of dynamics problems.

To obtain the value for the parameter G, multiply the critical damping ratio, C/C0 by 2.0.

Note:

1.To achieve identical displacements in Modal frequency response or Modal transient analyses when the SDAMPING bulk data entry is used instead of PARAM, G, the steps described here can be followed:
a)The TYPE field in the TABDMP1 bulk data entry should be set to CRIT. This TABDMP1 bulk data entry is referenced by the SDAMPING subcase information entry.
b)Set the damping value (field gi) in the TABDMP1 bulk data entry equal to half of the value of PARAM, G (that is set the constant value to C/C0).
c)Set PARAM,KDAMP,-1.
d)PARAM, G is ignored in Component Mode Synthesis (CMSMETH) Superelement Creation Run.
2.If GE is specified on MATx material data, the table ID for GE on MATTx material data or specified in the CELAS2, PELAS, PELAST, PBUSH, PBUSHT, PCOMP, PCOMPP, and PCOMPG data, then both GE and PARAM,G are used in analysis (they are added).
3.PARAM,G will be applied to the whole stiffness matrix (including reduced stiffness in DMIG), if specified in residual run. If both PARAM,G and the reduced structural damping in DMIG are used in residual run, both will be applied in analysis.

See Also:

PARAM, KDAMP

PARAM, GE_MOD

PARAM, MDK4OPT

Coupled Frequency Response Analysis of Fluid-Structure Models

Frequency Response Analysis

Transient Response Analysis