Atlas Copco STwrench - Residual Point Detection Algorithm

Pset STwrench User Guide
132 (326) 9836 4134 01 Edition 2.9
Note that if the breakaway point is over the Concave-down point threshold, the residual point is
never detected even if the residual point is before the Concave-up point threshold:
6.7.2.3.1 Residual point detection algorithm
The following algorithm is used to detect the torque/angle residual point:
The gradient
α
t
of the torque/angle trace is calculated by linear regression each time a new sample is
acquired, and the average of 6 different values α
t
is calculated:
6
6
1
∑
=
=
t
t
average
α
α
This
α
average
is used to identify the residual point.
Not detected
Concave-up
Concave-down