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ROTAR Y INERTIA
17.20
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ROTARY INERTIA: Define rigid body rotary iner tia.
This option is used to define rigid body rotary inertia values associated with ROTARYI elements.
It is also used in ABAQUS/Standard analyses to define mass proportional damping (for direct-integration
dynamic analysis) and composite damping (for modal dynamic analysis) associated with ROTARYI elements.
Products: ABAQUS/Standard ABAQUS/Explicit
Type: Model data
Level: Part, Part instance, Assembly
Reference:
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“Rotary inertia,” Section 24.2.1 of the ABAQUS Analysis User’s Manual
Required parameter:
ELSET
Set this parameter equal to the name of the element set containing the ROTARYI elements for which
the value is being given.
Optional parameters:
ALPHA
This parameter applies only to ABAQUS/Standard analyses.
Set this parameter equal to the
factor to create inertia proportional damping f or the
ROTARYI elements when used in direct-integra tion dynamics. This value is ignored in moda l
dynamics. The default is 0.0.
COMPOSITE
This parameter applies only to ABAQUS/Standard analyses.
Set this parameter equal to the fraction of critical damping to be used with the RO TA RYI
elements when calculating composite damping factors for the m odes when used in modal dynamics.
This value is ignored in direct-integration dynamics. The default is 0.0.
ORIENTATION
Set this param eter equal to the name of an
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ORIENTATION option (“Orientations,” Section 2.2.5
of the ABA QUS Analysis User’s Manual) that is being used to define the directions of the local axes
for which the rotary inertia values are being given. If the ORIENTATION param eter is omitted, it
is assumed t hat the components of the inertia tensor are being given with respect to the g lobal axes;
i.e., the global and local inertia axes coincide.
17.20–1
ABAQUS Version 6.1 Module:
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