`x`	The independent variable. For a force calculation, define a displacement result to specify the `x` argument.
`x'`	The derivative of the independent variable. For a force calculation, define a velocity result to specify the `x'` argument.
x₁	A positive real variable, number, or function. For a force calculation, specifies the free length of `x` when `x < x₁`. For a force calculation, the force is positive if `x < x₁`. The force is zero if `x ≥ x₁`.
`k`	A nonnegative value. For a force calculation, `k` is the stiffness of the boundary surface interaction.
e	A positive value. For a force calculation, `e` is the exponent of the force deformation characteristic. For a stiffening spring, enter `e > 1.0`. For a softening spring, enter `0 < e < 1.0`.
c_max	A nonnegative variable. For a force calculation, `c_max` is the maximum damping coefficient.
d	A positive real variable. For a force calculation, `d` is the boundary penetration at which the maximum damping `c_max` is applied.

Function Definition

IMPACT(x,x',x₁,k,e,c_max,d) =

max(0,k(x₁ - x)^e - STEP(x,x₁-d,c_max,x₁,0)x')	x < x₁
0	x ≥ x₁

Parent topic

Supported Functions

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