*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
If OPTION1 = NODE
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NID/set_ID DOF VAD fct_IDT FscaleY VID Tstop Tstart
If OPTION1 = SET
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set_ID DOF VAD fct_IDT FscaleY VID Tstop Tstart
If OPTION1 = RIGID
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Part_ID DOF VAD fct_IDT FscaleY VID Tstop Tstart

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.
RIGID
Rigid part ID is entered in Part_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)
Part_ID Rigid part 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_IDT Time curve identifier.

(Integer)
FscaleY Ordinate scale factor for fct_IDT.

Default = 1.0 (Real)
VID Vector identifier.
Tstop Stop time.

Default = 1028 (Real)

 [ s ]
Tstart Start time.

Default = 0.0 (Real)

 [ s ]

Comments

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