STwrench User Guide Pset
9836 4134 01 Edition 2.9 119 (326)
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1010
2
10
1
10
1
2
10
1
10
1
10
1
i
i
i
i
i
i
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i
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iit
A
A
AT
AT
α
The gradient
α
t
is recalculated by linear regression each time a new sample is acquired, and the average of
20 different values α
t
is calculated:
Each time a new sample is acquired, this average is also recalculated. If 30 consecutive values of this
α
average
(absolute value) are
not greater than a threshold value of the Linear slope Coefficient (LSC)
multiplied by 0.4, and for 1 degree they stay under the Linear slope Coefficient multiplied by 1.6, the yield
point is considered to have been detected:
The LSC is the slope of the torque/angle characteristic of the joint in the first part (linear), and it is defined
inside the Pset.
for 30 consecutive samples, and staying under 1.6xLSC for 1 degree → YIELD
POINT
The yield point result given by the STwrench is the first point when the
α
average
goes below 0.4xLSC.
Torque
Angle
average
> LSC x 0.4
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