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RESEARCH PAPERS: Rotor Dynamics

How to Start Transient Response Calculations for Rotating Structures Without Causing Centrifugal Force Shocks

[+] Author and Article Information
E. Niering

MTU München GmbH, Lerchenauerstr. 45, 8000 München 40, West Germany

J. Vib., Acoust., Stress, and Reliab 111(4), 386-391 (Oct 01, 1989) (6 pages) doi:10.1115/1.3269873 History: Received May 12, 1988; Revised October 28, 1988; Online November 23, 2009

Abstract

In computer programs for transient response calculations often only homogeneous and not more complicated, inhomogeneous initial conditions can be considered. The initial conditions assumed here are the stresses or displacements generated by the centrifugal force field in rotating structures. Nevertheless, calculations can be started with homogeneous initial conditions. The system has then to be transferred to operating conditions in a precalculation by a suitable rotational speed characteristic. Only then can the actual simulation begin. The rotational speed characteristic must have the additional capability of establishing the inhomogeneous initial conditions in minimum time. Precise imitation of the long technical run-up procedure is undesirable because of high computer cost and numerical inaccuracy. Modal equations are taken as the basis for formulation of an optimization problem whose solution determines the optimum speed characteristic. For the technically important case where a single prevailing natural vibration has to be controlled, it is possible to state the solution explicitly. With several natural vibrations, the control must be determined numerically. The procedure is used in calculating the effects of bird strike on rotating turbine blades.

Copyright © 1989 by ASME
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