T12: Prudent Design for Transient Torsional Vibration in Mechanical Drives
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Date
2021
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Turbomachinery Laboratory, Texas A&M Engineering Experiment Station
Abstract
In addition to the conventional analysis to identify system torsional natural frequencies for rotating machinery train, there may be arequirement to perform transient analysis if the system will be exposed to transient torsional excitation, as identified A transienttorsional vibration of machinery train installed at site may go undetected until a certain number of events occur after which a low cyclefatigue failure could occur Some of the transient events are not possible to avoid such as the start of synchronous motor Meeting themachine design criteria to sustain high oscillating torque during transient events is difficult in terms of cost and effortFrom mechanical design perspective, paper emphasizes that based on frequency of occurrence of transients such as short circuitevents, what prudent action can be taken to protect main driveline To minimize the torsional oscillations startup of synchronousmotor driven train, driven inertia can be kept lower as much as possible by avoiding overdesign of the gear boxes and rotatingmachines to maintain high stiffness Pros and cons of using elastomeric type damper couplings, fluid couplings are also discussed astool to mitigate the high torsional oscillations during transient conditions such as startupWith published API guidelines and API recommended practices, the paper addresses when and how to tackle the design challenges ofrotating machinery -mechanical drive train With latest advent on power electronics, usage of various online protection and monitoringtools such as IGBT (insulated-gate bipolar transistor), partial discharge and flux monitoring system etc which may mitigate theoccurrence of short circuit events to high extent
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