*SetTorsionSpring() - symmetric torsion spring pair
Sets the properties of a symmetric torsion spring pair.
Syntax
*SetTorsionSpring(spr_name, LEFT|RIGHT,
TYPE_k, TOKEN_k,
TYPE_c, TOKEN_c,
f, l)
Token
- LIN
- Enter a value for: k and c
- CRV
- Use a Curve to represent the torsion spring behavior. See Comments.
- SPL3D
- Use a Spline3D to represent the torsion spring behavior. See Comments.
- EXPR
- Enter a solver expression that represents the torsion spring behavior.
Arguments
- spr_name
- The variable name of an existing torsion spring pair.
- LEFT RIGHT
- If LEFT is specified, the properties are assigned to the left spring, and the right spring properties are made symmetric to the left spring.
- k
- The stiffness coefficient of the torsion spring.
- c
- The damping coefficient of the torsion spring.
- f
- The load on the torsion spring when it has a particular angle.
- l
- The angle of the torsion spring when it has a particular load.
- curve_name, AKIMA|CUBIC|LINEAR|QUINTIC, `indep_variable`
- When using curve data, a curve, an interpolation method, and an independent variable must be specified, where curve_name is the variable name of an existing curve that represents the force characteristic, the interpolation method can be set to AKIMA, CUBIC, LINEAR, or QUINTIC. The indep_variable is the solver expression representing the independent variable along which the force curve is characterized.
- spl3d name, AKIMA|CUBIC|LINEAR| QUINTIC, 'indep_var1', 'indep_var2'
- When using spline3d, a Spline3D entity, an interpolation method, and two independent variables must be specified, where spl3d_name is the variable name of an existing Spline3D entity that would represent the force v/s two independent variables. The interpolation method can be set to AKIMA, CUBIC, LINEAR, or QUINTIC. indep_var1 is the solver expression for the first independent variable. indep_var2 is the solver expression that represents the second independent variable.
- `expression`
- A solver expression for the torsion spring.
Example
*PointPair(p_bar_mnt_left, "Bar mnt left")
*PointPair(p_bar_mnt_right, "Bar mnt right")
*BodyPair(b_bar_left, "Bar left", p_bar_left_cg)
*BodyPair(b_bar_right, "Bar right", p_bar_right_cg)
*TorsionSpringPair(tspr, "Torsion spring",
b_bar_left,
b_bar_right,
p_bar_mnt_left,
p_bar_mnt_right)
*SetTorsionSpring(spring_uca, LEFT,
1.000e+02, 0.000e+00,
0.000e+00, 3.500e+02)
Context
Comments
Nonlinear properties for stiffness or damping cannot be specified for a symmetric pair.
To specify non-linear properties for the torsion spring in any direction, a solver expression, curve data, or spline 3D data can be used. When using solver expressions, Templex syntax is used and all variables are enclosed in braces {} and the rest is treated as literal.
The QUINTIC interpolation method is supported for MotionSolve only.