*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 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
If OPTION2 = ID, insert the next line.
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ID Title

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.