Dynamic Instability of a Turbine Generator due to Microslip-Reference-Cited by-同舟云学术

Dynamic Instability of a Turbine Generator due to Microslip

Published:1999-04-01 Issue:2 Volume:121 Page:162-168
ISSN:1048-9002
Container-title:Journal of Vibration and Acoustics
language:en
Short-container-title:

Author:

Wettergren H. L.¹,Csaba G.¹

Affiliation:

1. Dept. of Mechanical Engineering, Div. of Machine Design, Linko¨ping University, Sweden

Abstract

The present paper is concerned with dynamic instability of a turbine generator due to friction between rotor slot wedges and the rotor. When the normal force on the wedge is constant the dissipated energy is of the same type as hysteretic material damping in the sense that for a circular motion excluding gravity it is independent of the rotational frequency, but changes sign when the rotational frequency exceeds the vibrational frequency. The magnitude of the dissipated energy will however depend on the rotational frequency as the normal force does. The transferred energy due to friction is a nonlinear phenomenon and approximately proportional to the amplitude cubed and may be much larger than material damping. It is also shown that when gravity is included or the motion is elliptical the energy transferred is larger than for a simple circular motion.

Publisher

ASME International

Subject

General Engineering

Link

http://asmedigitalcollection.asme.org/vibrationacoustics/article-pdf/121/2/162/5825806/162_1.pdf

Reference16 articles.

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2. Black H. F. , and McTernanA. J., “Vibration of a Rotating Asymmetric Shaft Supported in Asymmetric Bearings,” Jour. of Mech. Eng. Sci., Vol. 10, 1968, pp. 252–261.

3. Csaba, G., “Microslip Friction Damping,” Linko¨ping University, Dept. of Mechanical Engineering, Lic. Thesis, Sweden, 1995.

4. Csaba, G., “Friction Damping of Turbine Blade Vibrations Using a Microslip Model,” Proceedings of the International Conference on Vibration and Noise, Venice, 25 to 27 April 1995, pp. 775–785.

5. Foote W. R. , PoritskyH., and SladeJ. J., “Critical Speeds of a Rotor with Unequal Shaft Flexibilities, Mounted in Bearings of Unequal Flexibilities,” ASME Journal of Applied Mechanics, Vol. 65, 1943, pp. 77–84.

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1. Material and Microslip Damping in a Rotor Taking Gravity and Anisotropic Bearings Into Account;Journal of Vibration and Acoustics;2000-08-01