Journal Bearings in Turbomachinery
This book deals with the functioning of hydrodynamic journal bearings in turbomachinery. It makes particular reference to large turbine generator and marine propulsion plant. Journal-bearing design in this field has been based mainly on experience supple
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Journal Bearings in Turbomachinery D. M. SMITH D.Se., LL.D., F.I.Meeh.E., F.R.Ae.S., F.R.S. Lately Consulting Mechanical Engineer, Turbine-Generator Division, Associated Electrical Industries Ltd.
Springer-Science+Business Media, B.V.
First published 1969
© David Macleish Smith 1969 Originally published by Chapman and Hall in 1969. Softcover reprint o/the hardcover 1st edition 1969 by Richard Clay (The Chaucer Press), Ltd., Bungay, Suffolk SBN 412
09590
4
ISBN 978-1-4757-5625-8 ISBN 978-1-4757-5623-4 (eBook) DOI 10.1007/978-1-4757-5623-4
Distributed in the U.S.A. by Barnes and Noble, Inc.
Contents
page vii
Preface Notation
ix PART I - THEORY AND PRACTICE
I
2
Bearing Development and Bearing Theory Current Practice in Journal Bearings
3 6
PART II - PERFORMANCE IN STEADY RUNNING
3 Functioning of Journal Bearings 4 Conventional Hydrodynamic Theory of Laminar Flow 5 Similarity Rules, Flow Regimes, and Characteristic Relations 6 Observed Bearing Performance 7 Approximate Assessment of Performance
19 22
42 56 69
PART III - DYNAMIC CHARACTERISTICS
8 Journal Bearings in Vibration Conventional Theory of Linearized Dynamic Characteristics with Laminar Flow 10 Effects of Inertia of Oil on Dynamic Characteristics II Experimental Investigation of Dynamic Characteristics 12 Influence of Bearings in Turbomachinery Vibration 9
77 84 109 II6 121
PART IV - OPERATIONAL EXPERIENCE AND PROSPECTIVE DEVELOPMENT
13 Operation ofJournal Bearings in Turbomachinery 14 Prospects in Development of Journal Bearings
133 140
vi
CONTENTS APPENDICES
Analytical Solution for Very Narrow Bearing II Analytical Solution for Infinitely Wide Bearing III Transformation of Axes I V Limiting Value of Characteristics at High Eccentricity Ratio v Definitions and Units of Viscosity VI Properties of Turbine Lubricating Oils VII The Apparent Out-of-balance Coefficients I
References Index
153 155 157 160 161
163 166 169
173
Preface
This book deals with the functioning of hydrodynamic journal bearings in turbomachinery. It makes particular reference to large turbinegenerator and marine propulsion plant. Journal-bearing design in this field has been based mainly on experience supplemented by full-scale experimental test. Development is becoming influenced to an increasing extent by research and analysis. Particular attention is given in this book to correlation of research and analytical work with the observed operating characteristics of journal bearings. The physical phenomena in bearings are complicated, and analysis is rendered convenient only by making simplifying assumptions. The engineer must know which assumptions are serviceable and in what operating conditions they may be applied. Current British and European practice in journal bearings is illustrated. An examination is made of steady running characteristics, as predicted by theory and as established by test. Some account is given of the dynamic characteristics of journal bearings and of their influence in machine vibration. Service experience of journal bearings is re
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