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10
Countermeasures:
1. Ensure optimal alignment of shaft train (note alignment data in specifica
tions!).
As long as the permissible limits for bending moment, transverse and lon
gitudinal forces are not exceeded, no special couplings or other measures
are necessary for the installation of the torque reference transducer (the
effects of parasitic limit loads can affect the measurement results by
approx. 0.2% of the nominal (rated) torque).
2. If the necessary alignment accuracy cannot be achieved, use non‐interact
ing couplings.
3. Keep the weight of the shaft sections acting on the torque reference trans
ducer as low as possible.
Depending on the structure of the test bench, decoupling measures with tor
sionally stiff, but pliable torsion bars may be necessary.
Deviating stiffness conditions
If the stiffness conditions in the shaft train (close to the torque transducer)
deviate from the conditions during calibration in the HBM calibration machine,
this will lead to a changed torque application in the torque reference trans
ducer.
Countermeasures:
1. Comply strictly with the specified tightening torques of the fastening
screws.
2. Use high‐strength or hardened adaptation components, particularly in the
vicinity of the transducer torque applications/transfers.
Asymmetric torque distributions
Asymmetric (axially uneven) torque distribution in the shaft train can lead to
deformations which, in turn, cause parasitic loads.
Countermeasures:
1. Use all available screw connections for fastening.
2. Comply strictly with the specified tightening torques of the fastening
screws.
3. Avoid making unnecessary holes in the adaptation flanges.
4. Use clean, flat and ground (as far as is possible) flange surfaces.
5. Avoid torque applications/transfers directly on the outer diameter of the
transducer.
HBM
TB2
A0884-5.0 en/de
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