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Rotordynamics of Gas-Lubricated Journal Bearing Systems : Mechanical Engineering Series - Krzysztof Czolczynski

Rotordynamics of Gas-Lubricated Journal Bearing Systems

Mechanical Engineering Series

Hardcover

Published: 24th September 1999
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Gas bearings are used to support rotating parts in a wide range of applicationsfrom heads in computer disk drives to gyroscopes. Its advantage is the very low viscosity of air compared to that of most oils used in lubrication. This book discusses models for the behavior of gas bearings, particularly those aspects that affect the stability of the system. It begins with a discussion of the mathematical models and applies these results to the design of gas-lubricated bearings.

Series Prefacep. v
Prefacep. vii
Introductionp. 1
Theory
Mathematical Model of a Gas Journal Bearingp. 11
Reynolds Equationp. 14
Numerical Solution of the Reynolds Equationp. 15
Equations of Mass Flow through Feeding Systemp. 18
"Orbit" Model of Gas Bearingp. 22
Identification of Stiffness and Damping Coefficientsp. 25
Free Vibrationsp. 26
Step-Jumpp. 27
Harmonic Forcingp. 27
Harmonic Motion of the Shaftp. 31
Accuracy of the Methodp. 37
Estimation of the Coefficients for any [Lambda] and [nu] - Interpolationp. 41
Mathematical Model of Rotor-Gas Bearing Systemp. 49
Equations of Motion - Symmetrical Systemp. 49
Reduced Systemp. 54
Method of Calculation of Eigenvaluesp. 57
Equations of Motion - Unsymmetrical Systemp. 58
Applications
Gas Bearingsp. 63
Static Characteristics of Gas Bearingsp. 64
Stiffness and Damping Coefficients of Gas Bearingsp. 66
Self-Acting Bearingsp. 66
Bearings with the Direct Feeding Systemp. 66
Bearings with the Chamber Feeding Systemp. 79
Conclusionsp. 79
Stability of Rotor - Gas Bearing Systemp. 83
Stability of Rotor with Unmovable Bushesp. 83
Stability of Rotor with Elastically Mounted Bushes - Symmetrical (Reduced) Systemp. 85
How to Design the Rotor Supportp. 93
Stability of Unsymmetrical Rotor with Elastically Mounted Bushesp. 96
Stability of the Homogeneous Shaft Supported in Two Bearingsp. 96
Stability of the Rotor with Concentrated Mass of the Shaftp. 98
Stability of the Unsymmetrical Rotor with the Unsymmetrical Support of the Bushesp. 101
An Influence of the Mass of the Bushes on the Size of Always-Stable Loopsp. 104
Air Ringsp. 105
Air Rings with the Direct Feeding Systemp. 105
Air Rings with the Chamber Feeding Systemp. 112
Air Hammerp. 113
Stiffness and Damping Coefficients of Air Ringsp. 116
Stability of the Rotor - Bearing - Air Rings System (Applications)p. 125
Application 1p. 126
Application 2p. 129
Application 3p. 132
Application 4p. 135
Referencesp. 141
Notationp. 147
Indexp. 151
Table of Contents provided by Syndetics. All Rights Reserved.

ISBN: 9780387986777
ISBN-10: 0387986774
Series: Mechanical Engineering Series
Audience: Professional
Format: Hardcover
Language: English
Number Of Pages: 152
Published: 24th September 1999
Publisher: Springer-Verlag New York Inc.
Country of Publication: US
Dimensions (cm): 23.5 x 15.5  x 1.27
Weight (kg): 0.93