The measurements prompted maintenance personnel to remove the components for inspection and repair, during which time small cracks were found. The identification of these fatigue cracks would have remained hidden without transient torque measurements until further propagation or fracture. Additionally, the removal of the component before the cracks propagate further can significantly reduce equipment downtime associated with the complete fracture of the components.


Benefits of continuous torque monitoring


Harmful torsional vibrations can occur due to process conditions and transient events or can simply be inherent to the design of the drivetrain. As most equipment is not instrumented to measure these vibrations, failure is often the first indication of their presence. In some cases, preventive (time-based)


tasks can be used to identify the presence of torsional vibration, but these methods have limited effectiveness in determining the severity and source.


Drivetrains susceptible to torsional vibrations are used in numerous industries and include slow speed equipment as well as turbomachinery. API standards (617, 2002 and 684, 2005) provide guidance on torsional modelling, natural frequency calculations, and recommended margins of separation to avoid resonant conditions. Unfortunately, these standards are not used to the extent they could be in other industries to avoid failures due to torsional vibration.


Predictive methods which include the measurement and analysis of transient torque can be employed on a temporary or continuous basis. Torque measurements can be utilized to evaluate stress safety factors for new designs, throughput increases, and other modifications to the drivetrain. Additionally, continuous torque monitoring can be utilized to capture adverse conditions which could initiate fatigue cracks in drivetrain components, which are difficult to detect with conventional vibration analysis.


The original article can be read on the Regal Rexnord website at: https://www.regalrexnord.com/brands/perceptiv/solutions/preventive-and-predictive-methods-for-torsional-vibration


THE REPORT | SEP 2024 | ISSUE 109 | 75


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