*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 tra nsfer
analysis, to define the motionof 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 32.1.1of the ABAQUS Analysis User ’sManual
•“Steady-state transport analysis,” Section6.4.1 of the ABAQUS A nalysisUser ’sManual
•“Static stress analysis,” Section 6.2.2of the ABAQUS Analysis User ’sManual
•“UMOTION,” Section 1.1.34 of the ABAQUS User SubroutinesReference 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 gl obal coordinate
system or in the local coordinatesystem if*TRANSFORM was used at these nodes. Translational
motion is the default.
USER
Include this parameter to indicate that magnitudes of mo tion will be defined in user subroutine
UMOTION. If this parameter is used, any magnitudes defined by the data lines can be redefinedin
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 transportanalysis.
Optional parameters:
AMPLITUDE
Set this parameter equal to thenam e ofthe am plitudecurve (defined in the *AMPLITUDE opti on)
that gives the time variation of the motion throughout the step (“Amplit ude curves,” Section 27.1.2
of the ABAQUS Analysis User’s Manual).
If this parameter is omitted and the translational or rotational mot ion is given with
TYPE=DISPLACEMENT, the default is a RAMP function. Ifthe translational or rotational motion
13.21–1
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