*SetForce() - rotational
Sets the values for a rotational action-only or action-reaction force (torque).
Syntax
*SetForce(force_name, TYPE_tx, TOKEN_tx,
TYPE_ty, TOKEN_ty,
TYPE_tz, TOKEN_tz)
Token
- LIN
- Enter a value for tx, ty, and tz.
- CRV
- Use a Curve to represent the torque behavior. See Comments.
- SPL3D
- Use a Spline3D to represent the torque behavior. See Comments.
- EXPR
- Enter a solver expression that represents the torque behavior.
Arguments
- force_name
- The variable name of an existing rotational action-only or action-reaction force.
- tx, ty, tz
- Numbers, MDL expressions, or solver expressions that determine the values of the rotational forces about the X, Y, and Z axis.
- 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 torque 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 torque 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 torque 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`
- An expression for the torque.
Example
Example 1
*Body(b_body, “body")
*Point (p_frc, "Wheel center")
*ActionOnlyForce(frc_rot,
"Applied rotational force",
ROT,
b_body,
p_frc)
*SetForce(frc_rot, LIN, ds.real1.value * ds.real2.value,
LIN, 10.3,
LIN, ds.real3.value,
)
Example 2
*SetForce(frc_rot, CRV, crv_torq_y, AKIMA, `{frc_wc.l.AX}`,
SPL3D, spl_torq_y, AKIMA, `{frc_wc.r.AY},
`WY({frc_wc.r.i.idstring},{frc_wc.r.j.idstring})`,
EXPR,‘100*sin(2*PI*TIME)‘)
Context
Comments
To specify non-linear properties for the force (torque) 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.