*CONSTRAINED_JOINT_STIFFNESS

LS-DYNA Input Interface KeywordDefine a stiffness, stop angles and friction for rotational DOFs of a joint between two rigid bodies.

Format

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*CONSTRAINED_JOINT_STIFFNESS_{OPTION}
If OPTION = ID, insert the following line.
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Title
If OPTION = GENERALIZED, insert the following line.
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JSID PIDA PIDB CIDA CIDB    
LCIDPH LCIDTH LCIDPS LCIDDPH LCIDDTH LCIDDPS  
ESPH FMPH ESTH FMTH ESPS FMPS  
NSAPH PSAPH NSATH PSATH NSAPS PSAPS  

Definition

Field Contents SI Unit Example
JSID Joint ID.

(Integer)

Title Joint title.

(Character, maximum 70 characters)

PIDA Part ID for first rigid component.

(Integer)

PIDB Part ID for second rigid component.

(Integer)

CIDA Coordinate system for the first rigid component.

(Integer)

CIDB Coordinate system for the second rigid component.

(Integer)

LCIDPH Curve ID for moment versus angle in radians around PHI axis.

(Integer)

LCIDTH Curve ID for moment versus angle in radians around THETA axis.

(Integer)

LCIDPS Curve ID for moment versus angle in radians around PSI axis.

(Integer)

LCIDDPH Curve ID for damping moment versus rotational velocity around PHI axis.

(Integer)

LCIDDTH Curve ID for damping moment versus rotational velocity around THETA axis.

(Integer)

LCIDDPS Curve ID for damping moment versus rotational velocity around PSI axis.

(Integer)

ESPH Elastic stiffness for friction and stop angle around PHI axis.

(Integer)

[ N m ]
FMPH
> 0
Friction force for PHI axis.
< 0
Curve ID for friction force versus angle for PHI axis.

(Integer)

[ N ] or None
ESTH Elastic stiffness for friction and stop angle around THETA axis.

(Integer)

[ N m ]
FMTH
> 0
Friction force for THETA axis.
< 0
Curve ID for friction force versus angle for THETA axis.

(Integer)

[ N ] or None
ESPS Elastic stiffness for friction and stop angle around PSI axis.

(Integer)

[ N m ]
FMPS
> 0
Friction force for THETA axis.
< 0
Curve ID for friction force versus angle for PSI axis.

(Integer)

[ N ] or None
NSAPH Stop angle in negative PHI direction.

(Real, positive)

[ deg ]
PSAPH Stop angle in positive PHI direction.

(Real, positive)

[ deg ]
NSATH Stop angle in negative THETA direction.

(Real, positive)

[ deg ]
PSATH Stop angle in positive THETA direction.

(Real, positive)

[ deg ]
NSAPS Stop angle in negative PSI direction.

(Real, positive)

[ deg ]
PSAPS Stop angle in positive PSI direction.

(Real, positive)

[ deg ]

Comments

  1. This keyword maps to /SPRING, /PROP/TYPE45 (KJOINT2) and /PART.
  2. It works in combination with kinematic joint and determines stiffness, friction, and stop angles for rotational degrees of freedom for joints interconnecting rigid components, PIDA and PIDB.