*MOTION
is given with TYPE=VELOCITY, the default is a STEP function for cavity radiation analysis and
a RAMP function for steady-state transport analysis.
TYPE
This parameter is used to specify whether the magnitude is in the form of a displacement or a
velocity.
Set TYPE=DISPLACEMENT (default for cavity radiation analysis) to give translational or
rotational displacement values.
Set TYPE=VELOCITY (only type available for steady-state transport and static analysis)
to give translational or rotational velocities. Velocity histories for cavity radiation problems can
be specified as illustrated in the discussion on prescribing large rotations in “C avity radiation,”
Section 32.1.1 of the ABAQUS Analysis User’s Manual.
Data lines to define translational motion (TRANSLATION):
First line:
1. Node set label or node number.
2. Firsttranslational component of motion prescribed (only degrees of freedom 1, 2, or 3 can be
entered). See “C onventions,”Section 1.2.2 of the ABAQUS Analysis User’s Manual, for a
definition of the numbering of degrees of freedom in ABAQUS.
3. Lasttra nslational component of motion prescribed (only degrees of freedom 1, 2, or 3 can be
entered). This field can be left blank if m otion for only one component is being prescribed.
4. Magnitudeof the translational displacement or velocity. This magnitude will be modified by
the *AMPLITUDE specification if the AMPLITUDE parameter is used.
Repeat this data line as oftenas necessaryto define translational motion for differentnodes and degrees
of freedom.
Data lines to define rotational motion (ROTATION):
First line:
1. Node set label or node number.
2. Magnitudeof the r otation (in radians) or rotational velocity (in radians/time). Thismagnitude
will be modified by the *AMPLITUDE specification if the AMPLITUDE parameter is used.
The rotation is about the axis defined from pointato p oint b, where the coordinates of aand
bare given next. In steady-state tr ansport analysis the position and orientation of the rotation
axis are applied at the beginning of the step and remain fixed during the step.
3. Globalx-compone nt of point aon the axis of rotation.
4. Globaly-compone nt of point aon the axis of rotation.
13.21–2
ABAQUS Version 6.1 Module: ID:
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