# *SetForce() - asymmetric translational and rotational

Sets the values for an asymmetric translational and rotational action-only or action-reaction force pair.

## Syntax

```
*SetForce(force_name, , TYPE_fx_l, TOKEN_fx_l,
TYPE_fy_l, TOKEN_fy_l,
TYPE_fz_l, TOKEN_fz_l,
TYPE_tx_l, TOKEN_tx_l,
TYPE_ty_l, TOKEN_ty_l,
TYPE_tz_l, TOKEN_tz_l,
TYPE_fx_r, TOKEN_fx_r,
TYPE_fy_r, TOKEN_fy_r,
TYPE_fz_r, TOKEN_fz_r,
TYPE_tx_r, TOKEN_tx_r,
TYPE_ty_r, TOKEN_ty_r,
TYPE_tz_r, TOKEN_tz_r)
```

## Token

- LIN
- Enter a value for fx_l, fy_l, fz_l, tx_l, ty_l, tz_l, fx_r, fy_r, fz_r, tx_r, ty_r, and tz_r.
- CRV
- Use a Curve to represent the force/torque behavior. See Comments.
- SPL3D
- Use a Spline3D to represent the force/torque behavior. See Comments.
- EXPR
- Enter a solver expression that represents the force/torque behavior.

## Arguments

- force_name
- The variable name of an existing translational and rotational action-only or action-reaction force pair.
- fx_l, fy_l, fz_l
- Numbers, MDL expressions, or solver expressions that determine the values of the translational X, Y, and Z components of the left force.
- tx_l, ty_l, tz_l
- Numbers, MDL expressions, or solver expressions that determine the values of the rotational forces about the left X, Y, and Z axis.
- fx_r, fy_r, fz_r
- Numbers, MDL expressions, or solver expressions that determine the values of the translational X, Y, and Z components of the right force.
- tx_r, ty_r, tz_r
- Numbers, MDL expressions, or solver expressions that determine the values of the rotational forces about the right 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 force/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 force/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 force/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`
- A solver expression for the force/torque.

## Example

The following example demonstrates usage of different types and tokens used for translation and rotations part of the action reaction force pair. While left and right side translation Y force uses a curve, left side rotational force about X uses a spline3D. Left side translation Z and rotational Z use expressions.

```
*BodyPair(b_wheel, "Wheel body")
*PointPair(p_wc, "Wheel center")
*ActionOnlyForcePair(frc_asym,
"Assymetrical force",
TRANS_ROT,
b_wheel,
p_wc)
*SetForce(frc_asym, , LIN, 12,
CRV, crv_frc, AKIMA , `{frc_asym.l.DY}`,
EXPR, `100*sin(2*PI*TIME)`,
SPL3D, spl3d_frc_ay, CUBIC, `{frc_asym.l.AX}`,
LIN, 13,
EXPR, `1000*sin(2*PI*TIME)`,
LIN, 20 ,
CRV, crv_frc, , `{frc_asym.r.DY}`,
LIN, 2000 ,
LIN, ,
LIN, ,
LIN)
```

## Context

## Comments

The second argument (used to specify symmetry) is left empty when specifying asymmetric properties for a bushing pair.

To specify non-linear properties for the force 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.