IMPACT

Langunage type

SubRoutine

FORTRAN

call rd_impact(x, xdot, x1, k, e, cmax, d, order, value, errflg)

or impact(x, xdot, x1, k, e, cmax, d, order, value, errflg)

C/C++

rd_impact(x, xdot, x1, k, e, cmax, d, order, &value[0], &errflg)

or impact(x, xdot, x1, k, e, cmax, d, order, &value[0], &errflg)

Parameter information

Variable Name	Size	Description
x	double	Specify the distance variable the user want to use to compute the force.
xdot	double	Communicate to IMPACT the time derivative of X.
x1	double	Specify the free length of x.
k	double	Specify the stiffness of boundary surface interaction.
e	double	Specify the exponent of the force deformation characteristic.
cmax	double	Specify the maximum damping coefficient.
d	double	The depth at which the damping coefficient reaches 0.
order	int	1) order = 0 2) order = 1 3) order = 2
value	double [3]	1) order = 0 2) order = 1 3) order = 2
error	logical / int	If an error is encountered in invoking Predefined subroutine, this variable becomes true. This variable must be declared as a logical variable.