ProductsAbaqus/Standard TypeHistory data LevelStep
Specifying motion during cavity radiation heat transfer analysis,
steady-state transport analysis, or static analysis
Optional, 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).
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 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
Cavity Radiation in Abaqus/Standard.
Data lines to define
translational motion (TRANSLATION)- First
line
Node set label or node number.
First translational component of motion prescribed (only degrees of freedom
1, 2, or 3 can be entered). See
Conventions
for a definition of the numbering of degrees of freedom in
Abaqus.
Last translational component of motion prescribed (only degrees of freedom
1, 2, or 3 can be entered). This field can be left blank if motion for only one
component is being prescribed.
Magnitude of 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 often
as necessary to define translational motion for different nodes and degrees of
freedom.
Data lines to define
rotational motion (ROTATION)- First
line
Node set label or node number.
Magnitude of the rotation (in radians) or rotational velocity (in
radians/time). This magnitude will be modified by the
AMPLITUDE specification if the AMPLITUDE parameter is used. The rotation is about the axis defined from
point a to point b, where the
coordinates of a and b are given
next. In steady-state transport analysis the position and orientation of the
rotation axis are applied at the beginning of the step and remain fixed during
the step.
Global x-component of point a on
the axis of rotation.
Global y-component of point a on
the axis of rotation.
- The following data are required only for
three-dimensional cases:
Global z-component of point a on
the axis of rotation.
Global x-component of point b on
the axis of rotation.
Global y-component of point b on
the axis of rotation.
Global z-component of point b on
the axis of rotation.
Repeat this data line as often
as necessary to define rotational motion for different
nodes.
Data lines to define
motion in user subroutine UMOTION (USER)- First
line
Node set label or node number.
First translational component of motion prescribed (only degrees of freedom
1, 2, or 3 can be entered). See
Conventions
for a definition of the numbering of degrees of freedom in
Abaqus.
Last translational component of motion prescribed (only degrees of freedom
1, 2, or 3 can be entered). This field can be left blank if motion for only one
component is being prescribed.
Magnitude of the translational displacement or rotation. This magnitude can
be redefined in user subroutine
UMOTION.
Repeat this data line as often
as necessary to define the nodes and degrees of freedom that will have their
motion prescribed by user subroutine
UMOTION.
Specifying motion during an eddy current analysis
Required parameters- ELEMENT
Include this parameter to specify the motion of an element set.
Optional, 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.
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).
If this parameter is omitted, the default is a STEP function.
Data lines to define
translational velocity of motion (TRANSLATION)- First (and
only) line
Element set label or element number.
First component of the direction cosine of the translational velocity
vector.
Second component of the direction cosine of the translational velocity
vector.
Third component of the direction cosine of the translational velocity
vector.
Magnitude of the translational velocity. This magnitude will be modified by
the
AMPLITUDE specification if the AMPLITUDE parameter is used.
Data line to define
rotational velocity of motion (ROTATION)- First (and
only) line
Element set label or element number.
Magnitude of the rotation (in radians) or rotational velocity (in
radians/time). This magnitude will be modified by the
AMPLITUDE specification if the AMPLITUDE parameter is used. The rotation is about the axis defined from
point a to point b, where the
coordinates of a and b are given
next. The position and orientation of the rotation axis are applied at the
beginning of the step and remain fixed during the step.
Global x-component of point a on
the axis of rotation.
Global y-component of point a on
the axis of rotation.
- The following data are required only for
three-dimensional cases:
Global z-component of point a on
the axis of rotation.
Global x-component of point b on
the axis of rotation.
Global y-component of point b on
the axis of rotation.
Global z-component of point b on
the axis of rotation.
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