Welcome to Adams/Solver Subroutines - Kxcad.net

66
Adams/Solver
a
b
c
IMPACT
IMPACT is a simple model for contacts. It evaluates a force that turns on when a distance falls below a
nominal free length (that is, when two parts collide).
Use
( h0 + h1) = ---------------------
2
Called By
Any user-written subroutine
Prerequisite
None
( h1 – h0) = ---------------------
2
( x – x0) = ---------------------
( x1 – x0) HAVSIN
h0 ; x ≤x0
a b c π π
⎧ ⎫
⎪ ⎪
⎪ ⎛ ⋅ – --⎞
⎪
= ⎨ + ⋅sin
; x
⎝ 2⎠
0 < x < x2⎬ ⎪ ⎪
⎪
⎩
h2 ; x ≥ x
⎪
1 ⎭
Caution: • The value x1 must not equal x0. Equal values of x1 and x0 imply a sharp step,
which HAVSIN cannot fit.
• At x0 and x1, the second derivatives of the haversine function do not match the
second derivatives of the constant regions. This discontinuity increases as the
values for x1 and x0 become closer (that is, as the haversine becomes sharper).
Because of the discontinuity, integration problems can arise if the haversine is
sharp.
• The STEP general subroutine (see STEP) is an alternative to HAVSIN.