*MODAL DYNAMIC
13.11 *MODAL DYNAMIC: Dynamictime history analysis using modal superposition.
This option is used to provide dynamic time history response as a line ar perturbation procedure using modal
superposition.
Product: ABAQUS/Standard
Type: History data
Level: Step
Reference:
•“Transientm odal dynamic analysis,” Section6.3.7 of the ABAQUS Analysis User ’sManual
Optional parameter:
CONTINUE
Set CONTINUE=NO (default) to specify that this step is not to carry over the initial conditions
from the results of the preceding step. In this case the initial displacements are zero, and the initial
velocities are taken from the *INITIAL CONDITIONS, TYPE=VELOCITY option if it is used;
otherwise, they are zero. Step time begins at zero.
Set CONTINUE=YES to specify that this step is to carry over the initial conditionsfrom the
end of the immediately preceding *MODAL DYNAMIC step or static perturbation step. If this
preceding step is a *MODAL DYNAMIC step, both the velocities and the displacements from
the end of this step are used as the initial conditionsfor the current step. If this preceding step is
a static perturbation step, the displacements from this step are used as the initial displacements
for the current step and the initial velocities are taken from the *INITIAL CONDITIONS,
TYPE=VELOCITY option if it is used; otherwise, they are zero. Step time is continued from the
immediately preceding *MODAL DYNAMIC or static perturbation step.
Data line for a transient modal dynamicanalysis:
First (and only) line:
1. Timeincrement to be used.
2. Time peri od.
13.11–1
ABAQUS Version 6.1 Module: ID:
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