A Mechanism of Low Subharmonic Response in Rotor/Stator Contact—Measurements and Simulations

Author:

von Groll Go¨tz1,Ewins David J.1

Affiliation:

1. Department of Mechanical Engineering, Imperial College of Science, Technology and Medicine, London SW7 2BX, United Kingdom

Abstract

There are a variety of abnormal running conditions in rotating machinery that lead to rotor/stator interaction dynamics which, in turn, have a range of effects associated with them. One of these effects is steady vibration response at frequencies which are different from the excitation. This paper describes a mechanism of generating subharmonic vibration frequencies in both numerical simulation and measurements, which are obtained from a study of the relatively new problem of “windmilling imbalance” in aero-engines. What is different from other nonlinear systems with, say, clearance or squeeze film dampers, is the richness of the frequency spectrum.

Publisher

ASME International

Subject

General Engineering

Reference13 articles.

1. Ehrich, Fredric F. , 1988, “High Order Subharmonic Response of High Speed Rotors in Bearings Clearance,” ASME J. Vibr. Acoust., 110(1), pp. 9–16.

2. Ehrich, Fredric F., 1989, “A State-of-the-Art Survey in Rotor Dynamics—Nonlinear and Self-Excited Vibration Phenomena,” Proceedings of the Second International Symposium on Transport Phenomena, Dynamics, and Design of Rotating Machinery, Part II, pp. 3–25, Honolulu, April.

3. Childs, Dara W. , 1982, “Fractional-Frequency Rotor Motion due to Nonsymmetric Clearance Effects,” ASME J. Eng. Power, 104(3), pp. 536–541, July.

4. Ge´radin, M., and Kill, N., 1988, “Non-Linear Dynamic Analysis of Flexible Rotors,” Fourth International Conference on Vibrations in Rotating Machinery, pp. 627–634, Institution of Mechanical Engineers, UK.

5. Choi, Yeon-Sun, and Noah, Sherif T., 1987, “Nonlinear Steady-State Response of a Rotor Support System,” ASME J. Vibr. Acoust., 109(1), pp. 255–261.

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