D
x
Telemetry System
Manual Vers. 2.7
92
/
92
12 Formulas
12.1 Sensitivity of torsion measuring points
The following formulas are valid for a steel shaft, a full bridge and a k factor of 2.0 for the
strain gauge.
12.1.1 Solid shaft sensitivity calculation
1
,
62
3
d
M
S
MAX
T
STEEL
12.1.2 Hollow shaft sensitivity calculation
1
,
62
4
4
I
A
A
TMAX
STEEL
d
d
d
M
S
12.1.3 k-factor sensitivity calculation
2
k
S
S
STEEL
S
= Sensitivity in mV/V
S
STEEL
= Sensitivity in mV/V
M
TMAX
= Maximum torque in Nm
d
= Diameter of solid shaft
D
A
= Outer diameter of hollow shaft
d
I
= Inner diameter of hollow shaft
k
= Correction factor:
3,03 for Al
2,05 for Ti
approx. 70 for unfilled plastics
