*SetForce() - asymmetric translational

Sets the values for an asymmetric translational 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_fx_r, TOKEN_fx_r, 
                                  TYPE_fy_r, TOKEN_fy_r, 
                                  TYPE_fz_r, TOKEN_fz_r)

Token

If you select this TYPE, use this TOKEN

LIN

Enter a value for fx_l, fy_l, fz_l, fx_r, fy_r, and fz_r.

Token: Value

CRV

Use a Curve to represent the force behavior. See Comments.

Token: curve_name,

AKIMA|CUBIC|LINEAR|QUINTIC,

`indep_variable`

SPL3D

Use a Spline3D to represent the force behavior. See Comments.

Token: spl3d_name,

AKIMA|CUBIC|LINEAR|QUINTIC

'indep_var1',

'indep_var2'

EXPR

Enter a solver expression that represents the force behavior.

Token: `expression`

Arguments

force_name: The variable name of an existing translational action-only or action-reaction force pair.; Data type: varname
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.; Data type: real or string
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.; Data type: real or string
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 force.

Example

Example 1

In the following example, the rotational force pair uses linear values for all except the TZ on the right side, which uses a solver expression. The left force TX uses a parametric expression that refers to a dataset.

*SetForce(frc_wc, , LIN, ds.real1.value * ds.real2.value, 
LIN, 10.3, 
LIN,ds.real3.value,
LIN,0.0, 
LIN, 0.0, 
EXPR,‘100*sin(2*PI*TIME)‘)

Example 2

The following example shows usage of setting forces with different types. TY of the rotation force left uses a curve (with the Y rotational displacements of the force markers as independent variable), and TY on the right side uses a spline3D (second independent variable is angular velocity between force markers). TZ on the right uses a solver expression.

*SetForce(frc_wc, , LIN, ds.real1.value * ds.real2.value, 
CRV, crv_torq_y, AKIMA, `{frc_wc.l.AY}`, 
LIN,ds.real3.value,
LIN,0.0, 
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

*BeginMdl()

*DefineAnalysis()

*DefineSystem()

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.