Installation
16
A01639_02_X00_00
HBM: public
TN
6.7
Loading capacity
Torque transfer standards can be used to measure static and dynamic torque.
Please note the following when measuring dynamic torque:
S
The natural frequency f
0
for the mechanical measuring system depends on
the moments of inertia J
1
and J
2
of the connected rotating masses and the
torsional stiffness of the torque transfer standard.
The natural frequency f
0
for the mechanical measuring system can be deter
mined from the below equation:
f
0
+
1
2
p
·
c
T
·
ǒ
1
J
1
)
1
J
2
Ǔ
Ǹ
f
0
=
Natural frequency in Hz
J
1,
J
2
=
Mass moment of inertia in kg
⋅
m
2
c
T
=
Torsional stiffness in N
⋅
m/rad
S
The maximum permissible amplitude of vibration (peak to peak) may be
200 % of the TN's nominal (rated) torque. In all cases the vibration band
width must lie within the loading range defined by -M
nom
and +M
nom
.
Notice
Even where there is resonance, these mechanical limit values must be fol
lowed. The torsional spring stiffness and the moment of inertia for estimating
the natural frequency can be found in Chap. 11.