26 Bertec Corporation Instrumented Treadmill Manual
Data Acquisition and Load Calculations
Let us use hypothetical scale factors, in N/V and N•m/V*:
Then from the force and signal scale factors equation:
To calculate the point of application of the force, the force and couple equation is used. With h=0.015 m the coordinates of the
Center of Pressure on the belt will be:
* Note that if the results are needed in English Units, an alternative to converting them at the end of calculations is to convert the scale factors to English Units by
converting the rst three factors from N/V to lb/V, and the last three factors from N•m/V to ft•lb/V. This can be done by multiplying the rst three scale factors by 0.2248
lb/N, and last three scale factors by 0.7376 (ft•lb)/(N•m).
C
1
= 1000 N/V
C
2
= 1000 N/V
C
3
= 1500 N/V
C
4
= 300 N•m/V
C
5
= 300 N•m/V
C
6
= 250 N•m/V
F
x
= 1000 • (-0.145) = -145.0 N
F
y
= 1000 • (0.2235) = 223.5 N
F
z
= 1500 • (0.4765) = 714.8 N
M
x
= 300 • (0.3095) = 92.9 N•m
M
y
= 300 • (-0.0575) = -17.3 N•m
M
z
= 250 • (-0.1016) = 25.4 N•m
x
p
=
(-0.015) • (-145.0) + 17.3
714.8
= 0.027 m
y
p
=
= 0.125 m
(-0.015) • (223.5) + 92.9
714.8
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