In addition to using the torque data for discerning the effect of load on vibration measurements, the torque measurements can also be used to alert operators to adverse conditions. When the amplitude of torsional vibration is measured continuously, the number of instances where the amplitude exceeds a certain threshold can be counted, allowing for corrective


actions to be taken before fatigue failure occurs. These thresholds can be determined from stress analysis of the torque transmitting component, or based on a multiple of the nominal operating torque which would indicate abnormal conditions. An example of a torque trend is shown in Figure 10 which includes several instances of high amplitude torque spikes.


Figures 10a and b: Torque trend for rolling mill application (left) and magnified view of impacting occurring at the start of rolling process (right).


Photographs 7a and b: Inspection of drivetrain component subject to repeated high torques in Figure 11. Cracks located in the area shown (left) were detected using magnetic particle inspection (right).


74 | ISSUE 109 | SEP 2024 | THE REPORT


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