- 30 -
(V
FS
)(
)(E)(4)(D
o
4
-D
i
4
)
= T
FS
(N-m)
(TX
const
)(GF)(N)(16000)(1+
)(G
XMT
)(D
o
)
B1: Torque on Round Shafts
Step 1: Calculate Full Scale Torque, T
FS
(ft-lb)
The Full Scale Torque corresponds to a system output of 10 V.
For a solid steel shaft, use the calculator on our website at
or use the simplified equation below:
For all other shafts use the more general equation:
For metric applications with D
o
and D
i
in millimeters and T
FS
in
N-m, the general equation is:
Where E= 206.8 x 10
3
N/mm
2
Legend of Terms
D
i
Shaft Inner Diameter (in) (zero for solid shafts)
D
o
Shaft Outer Diameter (in)
E
Modulus of Elasticity (30 x 10
6
PSI steel)
GF
Gage Factor (specified on strain gage package)
G
XMT
Telemetry Transmitter Gain (user configurable,
typical is 4000 for ±500 microstrain range)
N
Number of Active Gages (4 for torque)
T
FS
Full Scale Torque (ft-lb)
TX
const
Transmitter constant = 2.5V
V
FS
Full Scale Output of System = 10 volts
Poisson’s Ratio (0.30 for steel)
For example, given a solid steel shaft with:
(1510.38 x 10
3
ft-lb/in
3
)(D
o
3
)
= T
FS
(ft-lb)
(GF) (G
XMT
)
(V
FS
)(
)(E)(4)(D
o
4
-D
i
4
)
= T
FS
(ft-lb)
(TX
const
)(GF)(N)(16)(1+
)(G
XMT
)(D
o
)(12)
Summary of Contents for TorqueTrak 10K-LP
Page 1: ...TorqueTrak 10K LP Torque Telemetry System User s Guide 869501 9_F ...
Page 2: ......
Page 45: ... 43 ...
