Hydrodynamic Lubrication

By: Yukio Hori

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Hardcover | 15 December 2005

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244 Pages

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24.77 x 17.15 x 1.91

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Hydrodynamic lubrication plays an important role in mechanical engineering, although not very many books have been published on the subject. This book was written with graduate students, researchers and designers in view.

The first four chapters are preparations for the following five chapters, where several most important subjects in hydrodynamic lubrication are discussed in detail, based on the author's own researches. Examples are oil whip (stability of rotating shafts), foil bearings in connection with magnetic tape storages, squeeze film between rigid surfaces and visco-elastic surfaces, theoretical and experimental analyses of temperature rise in bearings, those of turbulent lubricating film using the k-epsilon model.

Industry Reviews

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"Hydrodynamic lubrication, or the science of fluid film lubrication, is essential in large bearings for stream turbines, in small air-film-lifted magnetic heads for computer storage devices as well, and plays an important role in mechanical engineering. The present book originally published in Japanese details primarily the research work of the author and his coworkers. ... the book will prove to be an important reference work for researchers working in this area." (Jagdish Prakash, Zentralblatt MATH, Vol. 1109 (11), 2007)

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You Can Find This Book In

Non-Fiction Engineering & Technology Mechanical Engineering & Materials Mechanical Engineering Tribology including Friction & Lubrication Materials Science Mechanics of Fluids Hydraulics & Pneumatics

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Paperback

Published: 23rd August 2016

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Friction, Wear, and Lubrication	p. 1
Friction, Wear, and Lubrication ù Tribology	p. 1
Various Forms of Lubrication	p. 2
Solid Friction	p. 4
Hydrodynamic Lubrication	p. 6
Meanings of Tribology	p. 7
References	p. 8
Foundations of Hydrodynamic Lubrication	p. 9
Tower's Experiment	p. 9
Reynolds' Theory of Hydrodynamic Lubrication	p. 11
Interpretation of Reynolds' Equation	p. 18
References	p. 22
Fundamentals of Journal Bearings	p. 23
Circular Journal Bearings	p. 25
Cross Section of a Bearing	p. 25
Shape of the Oil Film	p. 26
Bearing Length (Bearing Width)	p. 27
Boundary Conditions for the Oil Film	p. 27
Infinitely Long Bearings	p. 29
Oil Film Pressure	p. 29
Infinitely Long Bearing Under Sommerfeld's Condition	p. 31
Infinitely Long Bearing Under Gumbel's Condition	p. 37
Short Bearings	p. 41
Oil Film Pressure	p. 41
Characteristics of a Short Bearing Under Gumbel's Condition	p. 42
Finite Length Bearings	p. 43
References	p. 46
Fundamentals of Thrust Bearings	p. 47
Infinitely Long Plane Pad Bearings	p. 48
Basic Formulae	p. 49
Basic Characteristics	p. 49
Finite Length Plane Pad Bearings	p. 54
Sector Pad Bearings	p. 55
Reynolds' Equation in Cylindrical Coordinates	p. 55
Numerical Solution of a Sector Pad	p. 57
Additional Topics	p. 58
Influence of Deformation of the Pad	p. 58
Magnetic Disk Memory Storage	p. 59
References	p. 60
Stability of a Rotating Shaft ù Oil Whip	p. 63
OilWhip	p. 64
Oil Whip Theory	p. 67
Oil Film Pressure	p. 68
Oil Film Force	p. 71
Linearization of the Oil Film Force	p. 72
Equations of Motion	p. 75
Stability Limit	p. 76
Occurrence of Oil Whip ù Hysteresis	p. 84
Coordinate Axes	p. 88
Stability of Multibearing Systems	p. 89
Influence of Earthquakes on Oil Whip	p. 92
Basic Equations	p. 94
Examples of Simulation	p. 95
Limit Cycle in an Unstable Domain	p. 98
Approximate Nonlinear Analysis of Journal Bearing Characteristics	p. 98
Results of Analysis	p. 101
Floating Bush Bearings	p. 102
Three Circular Arc Bearings	p. 106
Porous Bearings	p. 109
Governing Equations	p. 109
Stability of a Shaft System	p. 110
Chaos in Rotor-Bearing Systems	p. 1ll
Prevention of Oil Whip	p. 113
References
Foil Bearings	p. 119
Basic Equations	p. 121
Finite Element Solution of the Basic Equations	p. 122
Reynolds'Equation	p. 122
Equation of Balance for the Foil	p. 125
Solution Procedure	p. 126
Characteristics of Foil Bearings	p. 126
Single Cylinder Heads	p. 127
Double Cylinder Heads	p. 128
Comparison with Experiments	p. 13G
Additional Topics	p. 130
Magnetic Tape Memory Storage	p. 130
Foil Disk	p. 131
References	p. 136
Squeeze Film	p. 137
Basic Equations	p. 138
Squeeze Between Rigid Surfaces	p. 141
Squeeze Without Fluid Inertia	p. 141
Squeeze with Fluid Inertia	p. 142
Sinusoidal Squeeze Motion	p. 144
Sinusoidal Squeeze by a Rigid Surface (Experiments)	p. 145
Mild Sinusoidal Squeeze	p. 145
Intense Sinusoidal Squeeze ù Cavitation	p. 146
Sinusoidal Squeeze with a Soft Surface	p. 149
Low-Frequency Squeeze	p. 150
High-Frequency Squeeze	p. 153
Results of Experiment and Calculation	p. 154
References	p. 159
Heat Generation and Temperature Rise	p. 161
Basic Equations for Thermohydrodynamic Lubrication	p. 162
Generalized Reynolds' Equation	p. 163
Balance of Forces	p. 163
Flow Velocity	p. 164
Continuity Equation	p. 164
Generalized Reynolds'Equation	p. 165
Energy Equation	p. 166
General Energy Equation	p. 166
Energy Equation	p. 168
Transformation of the Energy Equation	p. 170
Temperature Distribution in Bearings	p. 171
Temperature Analyses of Tilting Pad Thrust Bearings ù Sector Pads	p. 172
Basic Equations	p. 173
Boundary Conditions	p. 175
Numerical Analyses	p. 175
Examples of Three-Dimensional Analyses of Temperature Distribution	p. 177
Comparisons of Three-Dimensional, Two-Dimensional, and Isoviscous Analyses	p. 178
Analysis Considering Inertia Forces	p. 180
Comparison of Calculated Results and Experiments	p. 184
Temperature Analyses of Circular Journal Bearings	p. 185
Basic Equations	p. 187
Boundary Conditions	p. 187
Comparison of Calculated Results and Experiments	p. 189
References	p. 193
Turbulent Lubrication	p. 197
Time-Average Equation of Motion and the Reynolds' Stress	p. 198
Turbulent Flow Model	p. 201
Mixing Length Model	p. 201
k-E Model	p. 203
Turbulent Lubrication Theory Using the Mixing Length Model	p. 204
Modified Mixing Length	p. 204
Turbulent Velocity Distribution Between Two Surfaces	p. 206
Turbulent Reynolds'Equation	p. 208
Turbulent Coefficients of Fluid Film Seals	p. 209
Comparison of Analyses Using the Mixing Length Model with Experiments	p. 211
Turbulent Static Characteristics of Fluid Film Seals	p. 211
Turbulent Dynamic Characteristics of Fluid Film Seals	p. 213
Turbulent Lubrication Theory Using the k-E Model	p. 214
Application of the Model to an Oil Film	p. 215
Turbulent Reynolds'Equation	p. 216
Comparison of Analyses Using the k-E Model with Experiments	p. 218
Reduction of Friction in a Turbulent Bearing by Toms' Effect	p. 222
Taylor Vortices in a Journal Bearing	p. 224
References	p. 226
Index	p. 229
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Hydrodynamic Lubrication

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Hardcover

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