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RESEARCH PAPERS: Gas Turbines: Structures and Dynamics

Comparison of the Rotor Dynamic and Structure Dynamic Calculation of Compressors

[+] Author and Article Information
M. Hohlrieder

Lödige Industries, 34144 Warburg, Federal Republic of Germany

H. Irretier

Institute of Mechanics, University of Kassel, 34109 Kassel, Federal Republic of Germany

J. Eng. Gas Turbines Power 119(2), 425-429 (Apr 01, 1997) (5 pages) doi:10.1115/1.2815592 History: Received June 20, 1995; Online November 19, 2007

Abstract

The paper presents the analysis of a compressor employing the method of cyclic symmetry incorporating gyroscopic effects and geometric nonlinearities of the whole elastic system based on the finite element method. Because of numerical difficulties, the solution of the resulting eigenvalue problem is limited to a small number of DOF’s. For this reason the calculation of the impeller as an elastic model is performed including the prestress and nonlinearities due to rotation. With the knowledge of these frequencies and the mass moment of inertia of the impeller, an equivalent system of rigid disk and speed dependent spring is included in the rotor dynamic model. Further, the gyroscopic effect, speed-dependent bearing coefficients, and the elastic effects due to the rotation of the impeller are included in the rotor dynamic model. For illustration purpose, calculation is performed on a fan rotor and the results are compared with those obtained from experiment.

Copyright © 1997 by The American Society of Mechanical Engineers
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