ABAQUS Volume II: I–Z - Manual (Page 169)

*MOTION
13.21 *MOTION: Specify motions as a predefined field.
This option is used to specify motions of node sets or individual nodes during cavity radiation heat transfer
analysis, to define the motion of a reference frame in steady-state transport analysis, or to define the velocity
of the material transported through the mesh during a static analysis.
Product: ABAQUS/Standard
Type: History data
Level: Step
References:
•
“Cavity radiation,” Section 32.1.1 of the ABAQUS Analysis User’s Manual
•
“Steady-state transport analysis,” Section 6.4.1 of the ABAQUS Analysis User’s Manual
•
“Static stress analysis,” Section 6.2.2 of the ABAQUS Analysis User’s Manual
•
“UMOTION,” Section 1.1.34 of the ABAQUS User Subroutines Reference Manual
Required, mutually exclusive parameters:
ROTATION
Include this parameter to define a rigid body rotation about an axis.
TRANSLATION
Include this parameter to give the x-, y-, and z-components of translation in the global coordinate
system or in the local coordinate system if *TRANSFORM was used at these nodes. Translational
motion is the default.
USER
Include this parameter to indicate that magnitudes of motion will be defined in user subroutine
UMOTION
. If this parameter is used, any magnitudes defined by the data lines can be redefined in
the user subroutine. The value of the TYPE parameter is not relevant when this parameter is used.
This parameter cannot be used for steady-state transport analysis.
Optional parameters:
AMPLITUDE
Set this parameter equal to the name of the amplitude curve (defined in the *AMPLITUDE option)
that gives the time variation of the motion throughout the step (“Amplitude curves,” Section 27.1.2
of the ABAQUS Analysis User’s Manual).
If this parameter is omitted and the translational or rotational motion is given with
TYPE=DISPLACEMENT, the default is a RAMP function. If the translational or rotational motion
13.21–1
ABAQUS Version 6.1 Module: ID:
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