Flexcom > Data Inputs > $LOAD CASE > *DAMPING FORMULATION

Purpose

To specify the damping formulation to be used in a time domain dynamic analysis.

Theory

Refer to Damping Formulation for further information on this feature.

Keyword Format

A single line to specify the damping formulation.

OPTION=Damping Formulation

Damping Formulation may be either UPDATED (the default) or CONSTANT. This option pertains specifically to time domain analysis, and should be omitted for frequency domain analysis.

Table Input

Input:	Description
Damping Formulation:	This option allows you to select the damping formulation. There are two types available, Updated (the default) and Constant. See Note (a).

Notes

(a)The structure damping matrix is by default computed at each solution step based on the instantaneous mass and stiffness matrices, and this is the case when the Updated damping formulation is selected. Alternatively, a Constant damping matrix may be used throughout an analysis, based on the mass and stiffness matrices at the static equilibrium position (that is, the position at the start of the dynamic analysis).

(b)This option is not relevant for frequency domain dynamic analysis.