Constrained Keywords

Type	Lets you select the LS-DYNA keyword to define.CONSTRAINED_NODE_SETDefines sets of nodes that are constrained in their translational degrees of freedom.CONSTRAINED_NODAL_RIGID_BODYDefines a nodal rigid body. The software uses the equations of rigid body dynamics to update the motion of the nodes. You can also define rotations of the nodal sets The software calculates mass properties from the nodal masses and coordinates. CONSTRAINED_EXTRA_NODESDefines additional nodes for the rigid body. You can define extra nodes anywhere in the model, even outside of the rigid body. The software assumes that these nodes are part of the rigid body. You can define extra nodes, for example, to define the location where joints will connect rigid bodies or to specify a lumped mass at a specific location.
Destination Folder
Constraint Container	Specifies the folder in the Simulation Navigator in which the boundary condition will be stored. The list includes the root container and existing folders that you created using the New Folder command. Examples of a root container include Load Container, Constraint Container, and Simulation Object Container.
Folder Manager	Displays a hierarchical listing of existing folders. To create a new folder, right-click any level of the hierarchy and choose New Folder.
Model Objects
Group Reference	Lets you apply the constraint to a group.For more information, see Group Reference options.
Select Object	Lets you select the geometry, mesh points, or nodes to which to apply the constraint.Use the Excluded options to remove individual entities, such as edges, from your selection.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
Keyword Name	Displays the name of the associated LS-DYNA keyword.

Constrained Node Set options

Translational Motion Degrees of Freedom
DOFX , DOFY, DOFZ	Constrains the nodes in the specified translational degrees-of-freedom.Off: Allows no movement in the DOF.On: Allows free movement in the DOF
All On	Sets all DOF to on.
All Off	Sets all DOF to off.
Property
Failure Time	Defines the time at which the nodal constraint set becomes inactive. After the Failure Time, the nodes can move freely.

Constrained Nodal Rigid Body options

*Independent Object (First Node of SET_NODE)
Select Object	Lets you select the interpolation node.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
*Dependent Objects (Second Node and Up of SET_NODE)
Select Object	Lets you specify the dependent nodes. If you specify multiple nodes, the software writes out the *SET_NODE_LIST keyword.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
Rigid Body Orientation
Rigid Body CSYS	Lets you specify the local coordinate system that defines the orientation of the rigid body.
Degrees of Freedom (DRFLAG,RRFLAG)
DOF1, DOF1, DOF3, DOF4, DOF5, DOF6	Constrains the nodes in the specified degrees-of-freedom.Off: Allows no movement in the DOF.On: Allows free movement in the DOF
All On	Sets all DOF to on.
All Off	Sets all DOF to off.
Rigid Body Physical Property Tables
LS-DYNA Parts	Opens the Physical Property Table Manager dialog box so that you can select the part ID of the rigid body.
Keyword Option
Optional Properties	Lets you specify a Constrained Nodal rigid Body Optional modeling object that you can use to specify additional options.

Constrained Extra Nodes options

Extra Nodes for Rigid Body option is selected.
Group Reference	Lets you apply the constraint to a group.For more information, see Group Reference options.
Select Object	Lets you select the extra nodes to add to the rigid body.
Stacked Smart Selector Methods	Opens the Smart Selector Methods dialog box where you can specify a progression of smart selection filters.For more information, see Smart Selector Methods dialog box.
LS-DYNA Parts (Physical Property Tables)
Property	Opens the Physical Property Table Manager dialog box so that you can select the part ID of the rigid body.
Update Inertia Properties After Merge
IFLAG	Controls whether the software updates the inertia properties Note: This option only applies if you define the inertia properties of the part ID with the *PART_INERTIA option.
Keyword Name	If you select a single node, the software writes out the *CONSTRAINED_EXTRA_NODES_NODE keyword. If you select multiple nodes, the software writes out the *CONSTRAINED_EXTRA_NODES_SET keyword.

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Constrained Keywords, Simcenter 3D 2021.1 Series

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