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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Reducing Lateral Vibrations of a Rotor Passing Through Critical Speeds by Acceleration Scheduling

[+] Author and Article Information
K. T. Millsaps, G. L. Reed

Marine Propulsion Laboratory, Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93943

J. Eng. Gas Turbines Power 120(3), 615-620 (Jul 01, 1998) (6 pages) doi:10.1115/1.2818190 History: Received March 07, 1997; Online November 19, 2007

Abstract

A method is presented for reducing the lateral response of an imbalanced rotor accelerating or decelerating through its first lateral bending critical speed by using a variable acceleration rate. A lumped parameter model along with a numerical integration scheme is used to simulate the response of a simply supported, single disk rotor during fast acceleration and deceleration through critical speed. The results indicate that the maximum response and/or the total vibrational energy of a rotor passing through the critical speed can be reduced significantly by using a variable acceleration schedule. That is, reducing the acceleration rate after the nominal critical speed is passed. These predictions were verified experimentally for a single disk rotor.

Copyright © 1998 by The American Society of Mechanical Engineers
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