2021

2021

*BOUNDARY_PRESCRIBED_MOTION

LS-DYNA Input Interface KeywordThis keyword defines an imposed velocity, acceleration, or displacement applied to a node or node set.

Format

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*BOUNDARY_PRESCRIBED_MOTION_OPTION1_{OPTION2}

If OPTION2 = ID, insert the next line.

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`ID`	`Title`

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`NID`/`set_ID`	`DOF`	`VAD`	`fct_ID`_T	`Fscale`_Y	`VID`	`T`_stop	`T`_start

Definition

Field	Contents	SI Unit Example
`OPTION1`	Boundary condition type. Required option. NODE Single node is entered as `NID`. SET Node set ID is entered in `set_ID`. (Character)
`OPTION2`	ID Optional flag to define an ID for the boundary condition. (Integer)
`Title`	Optional Imposed motion title (Character)
`NID`	Node identifier (Integer)
`set_ID`	Nodal set identifier (Integer)
`DOF`	Direction: = 1 X translation = 2 Y translation = 3 Z translation = 4 X translation in the direction defined by `VID` = -4 X translation in the direction defined by `VID` and fixed motion in the normal plane = 5 XX rotation = 6 YY rotation = 7 ZZ rotation = 8 XX rotation in the direction defined by `VID` = -8 XX rotation in the direction defined by `VID` and fixed rotation in the normal plane (Integer)
`VAD`	Motion type: = 0 Imposed velocity = 1 Imposed acceleration = 2 Imposed displacement
`fct_ID`_T	Time curve identifier. (Integer)
`Fscale`_Y	Ordinate scale factor for `fct_ID`_T. Default = 1.0 (Real)
`VID`	Vector Identifier.
`T`_stop	Stop time Default = 10²⁸ (Real)	$[s]$
`T`_start	Start time. Default = 0.0 (Real)	$[s]$

Comments

This keyword maps to /IMPVEL, /IMPACC, or /IMPDISP.