A Rayleigh-Type Inclusion of Shaft Inertia in Torsional Vibration Analysis

[+] Author and Article Information
S. Doughty

Doughty and Company, Registered Professional Engineers, 939 High Hill Creek Road, La Grange, TX 78945-4407

J. Eng. Gas Turbines Power 116(4), 831-837 (Oct 01, 1994) (7 pages) doi:10.1115/1.2906891 History: Received January 28, 1994; Online April 24, 2008


This paper considers the problem of properly accounting for the shafting inertia in torsional vibration analysis. It begins with a brief review of the two well-established methods: (1) arbitrarily lumping the shaft inertia with that of the disks, and (2) the continuum model, which considers both the flexibility and the inertia as distributed properties. Comments regarding the advantages and disadvantages of each are offered as motivation for the new method to be presented here. The new approach is then developed, using a Rayleigh-type approximation for the displacement between stations, with the full theory underlying it. The results of all three methods are then compared by application to several test cases.

Copyright © 1994 by The American Society of Mechanical Engineers
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