*SetTorsionSpring() - single torsion spring with user subroutine

Sets the properties of a torsion spring with a user subroutine.

Syntax

*SetTorsionSpring(spr_name, SFORCE, `solver_expression`) 
*Set(spr_name.use_local_dll, TRUE|FALSE) 
*Set(spr.local_dll, "string")

Arguments

spr_name: The variable name of an existing torsion spring.; Data type: varname
SFORCE: This argument indicates the type of user subroutine that is used to compute torsion spring properties.
solver_expression: A solver expression enclosed in back quotes to specify arguments for the user subroutine.; Data type: string
spr_name.use_local_dll: Specifies if a user subroutine DLL is specific to the instance of one coupler entity.; Data type: boolean
spr_name.local_dll: The path and filename for the user subroutine DLL to be used with an instance of the user defined coupler.; Data type: string

Example

*TorsionSpring( spr_tbar, "Torsion bar", 
b_upr, 
b_lwr, 
p_upr, 
p_lwr)
*Curve( crv_spr, "Rate")
 
*SetTorsionSpring(spr_tbar, SFORCE, `USER(1, { spr_tbar.i.id, %d }, 
 { spr_tbar.j.id, %d }, 
 { cr() }, `
 
 `-{ crv_spr.id, %d })`)

Context

*BeginMdl()

*DefineAnalysis()

*DefineSystem()

Comments

Torsion spring properties can be computed with user subroutines of type SFOSUB. A user executable must created when using these subroutines.

The solver expression specified follows Templex syntax where all the variables to be evaluated are enclosed in braces {} and the rest of the expression is treated as literal.