Torsional Vibration

Isolation of Torsional Vibrations in Rotating Machinery

Paper No. 23

F. R. Szenasi/Larry E. Blodgett, National Conference on Power Transmission, 1975, pp. 262-279 .

Torsional vibration response of rotating machinery must be determined when designing an equipment train. Accurate response prediction requires sophisticated analysis techniques which include consideration of all forcing functions in the system in addition to the mass elastic properties of the shafts and couplings. Matrix methods utilizing the eigenvalue solution provide an adequate solution technique. A proper understanding of the assumptions related to the solution technique is essential. Such areas as lumping, branched system interpretation, gear tooth flexibility, and coupling parameters are but a few examples where assumptions must be made which are essential to a proper solution. Isolation of torsional vibrations can be accomplished once the system torsional response is properly defined. Case histories utilizing this technique are presented to illustrate methods of torsional isolation.


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