Tsuneo Someya (Editor) Journal-Bearing Databook With Contributions by T. Someya, J. Mitsui, J. Esaki, S. Saito, Y Kanemitsu, T. Iwatsubo, M.Tanaka, S. Hisa, T. Fujikawa, H. Kanki With 60 Figures and 5 Tables Springer-Verlag Berlin Heidelberg NewYork London Paris Tokyo
Nomenclature 1. Introduction (By T. Someya) 1.1 General Information 1.1.1 Types of Journal Bearings 1.1.2 Main Dimensions of Journal Bearings 1.1. Coordinates for Journal Bearings 1.1. Assumptions in the Databook 1.2 Static Characteristics of Journal Bearings 1.2.1 Equilibrium Position of Journal Centre 1.2.2 Frictional Coefficient of Journal Bearings 1.2. Oil Flow of Journal Bearings 1.2. Heat Balance in Journal Bearings 1.2.5 Procedure for Calculation of Heat Balance in a Journal Bearing 1. Dynamic Characteristics of Journal Bearings 1..1 Definition of Coefficients of Oil Film 1..2 Determination of Coefficients of Oil Film by Calculation... 1.. Determination of Coefficients of Oil Film by Experiment... 1.. Comparison Between Calculated and Experimental Values for Coefficients of Oil Film 1. How to Use the Characteristic Data of Bearings in the Present Databook 1..1 Nature of the Data 1..2 An Example of Data 1.. Influences of L:D Ratio, Turbulence, Load Direction, etc.... 1.. Some Notes on Application of the Data References XIII 1 67 12 12 2. Calculated Data 1 Calculation Type of L.D m n Remarks P- 1 2 Axial grooved cylindrical.. 0 2 2 Axial grooved cylindrical.. 0 Axial grooved cylindrical.. 0 Axial grooved cylindrical.. 0 5 Pressure dam cylindrical... 0 6 Partial arc.. 7 Partial arc... 8 Partial arc... Partial arc... 2 Lobe. 12. 1. 1. 15. 16 Lobe 2/ / 2/ / 120 c 1 c 120 c 1 c 1 17 20 2 26 2 2 5 8 1 7 5 56 5 IX
Calculation Type of L :D m p Remarks P- 17 Lobe 18 Lobe 1..... Lobe 20 Lobe 21 Lobe 22 Lobe 2 Lobe 2 Pad tilting pad.... 25 Pad tilting pad.... 26 Pad tilting pad.... 27 Pad tilting pad.... 28 Pad tilting pad.... 2 Pad tilting pad.... 0 Pad tilting pad.... 1 Pad tilting pad.... 2 Pad tilting pad.... Pad tilting pad.... Pad tilting pad.... 5 Pad tilting pad.... 6 Pad tilting pad.... 7 Pad tilting pad.... 8 Pad tilting pad.... Pad tilting pad.... 0 5 Pad tilting pad.... 1 5 Pad tilting pad.... 2 5 Pad tilting pad........_. 5 Pad tilting pad.... 5 Pad tilting pad.... 5 5 Pad tilting pad.... 6 5 Pad tilting pad.... 7 5 Pad tilting pad.... 8 5 Pad tilting pad.... 5 Pad tilting pad.... 5 Pad tilting pad.... 51 5 Pad tilting pad.... 52 5 Pad tilting pad.... 5 5 Pad tilting pad.... 5 5 Pad tilting pad.... 55 5 Pad tilting pad.... 56 Hydrostatic 57 Spherical spiral grooved 58 Taper spiral grooved 5 Flat spiral grooved.. 2/... /... /5...... 2/... /... /5... 0..LBP 2/. LBP /. LBP 0..LBP 2/. LBP /. LBP 2/. LOP /. LOP 2/. LOP /. LOP 0.. LBP 2/. LBP /. LBP 0.. LBP 2/. LBP /. LBP 0..LOP 2/. LOP /. LOP 2/. LOP /. LOP 62 65 68 71 7 77 80 8 86 8 2 5 8 1 7 0 6 122 125 128 11 1 17 10 1 16 1 152 155 158 161 16 167 170 17 176 17 182 185 188. Experimental Data 11 Test no. Type of Diameter D(mm) Length L(mm) Radial clearance C p, Q(mm) Remarks P- 1 circular 10 10 0.1 12 X
Test no. Type of Diameter D(mm) Length L(mm) Radial clearance C p,c b (mm) Remarks P- 2 5 6 7 8 circular circular circular circular 2 lobe 2 lobe 2 lobe pad tilting pad 5 pad tilting pad 5 pad tilting pad 8 10 76. 25 0.8 0 5 1.6 0.5 0.10 0. 0.0 C p = 0.660 C b = 0.0 C p = 0. C b = 0.1 C p = 0.280 C b = 0.070 0.175 C p = 0.216 C fc = 0.5 0.086 m p = 0.5 m p = 0.67 m p = 0.75 p = 7.7, m p = 0, a/fi = 0.5, LBP P = 60, m p = 0.51, a/0 = 0.5, LOP p = 58, m p = 0, alp = 0.5, LOP 16 200 20 2 21 216 21 222 22 227. Explanations 21.1 Method of Calculation for Bearing Characteristics (By J. Mitsui)... 21.1.1 Generalized Reynolds Equation for Laminar Flow 21.1.2 Reynolds Equation for Turbulent Flow 22.1. Method of Calculation for Reynolds Equation 2.1. Boundary Condition for Oil Film Pressure 2.1.5 Calculation of Static Bearing Characteristics 26.1.6 Method of Calculation for Dimensionless Stiffness and Damping Coefficients of Oil Film 27.2 Methods of Measurement for Journal Bearing Characteristics (By J. Esaki) 20.2.1 Outline of Performance Characteristic Tests of Journal Bearing 20.2.2 Methods of Measurement for Oil Film Coefficients 22.2. Example of a Test Rig for Dynamic Characteristics of Journal Bearings 2.2. Experimental Results Obtained with Circular Bearings with Two Axial Grooves 25. Estimation of Effective Oil Film Temperature (By S. Saito) 28..1 Estimation from Calculated Data 28..2 Estimation from Measured Data 2 XI
. Boundary Condition for Oil Film Pressure Distribution (By Y. Kanemitsu) 2.5 Influences of Length: Diameter Ratio on Journal Bearing Characteristics (By J. Esaki) 251.6 Influences of Turbulent Flow on Journal Bearing Characteristics (By J. Esaki) 266.7 Analysis of Bearing Characteristics with Due Consideration for Viscosity Variation (By J. Mitsui) 278.7.1 Thermohydrodynamic Lubrication Theory 278.7.2 Examples of Temperature Distribution in the Bearing Bush.. 27.7. Bearing Characteristics Calculated by THD Theory 27.8 Unbalance Response of Rotors in Journal Bearing (By T. Iwatsubo) 282.8.1 Introduction 282.8.2 Equation of Motion 28.8. Unbalance Response 28.8. Unbalance Vibration Mode 28.8.5 Numerical Calculation of Unbalance Response 28.8.6 Damping Effect of Bearing 285.8.7 Application to a Complicated System 287.8.8 Summary 287. Stability of Rotors Supported by Plain Bearings (By M. Tanaka).. 288..1 Introduction 288..2 Oil Whip Phenomenon 288.. Theory of Oil Whip 28.. Occurrence and Growth of Oil Whip 20..5 Stability Criterion for Generalized Rotor-Bearing-System... 21..6 Stabilization Measures 22..7 Flow-Induced Vibration 2. Application to Steam Turbine Generator (By S. Hisa) 25..1 Introduction 25..2 Bearing Types and Operating Conditions 25.. Unbalance Response 27.. Self-Excited Vibration 00..5 Concluding Remarks 0. Application to Turbo-Compressors (By T. Fujikawa) 0..1 Introduction 0..2 Dynamic Design of Rotor Systems According to API Standard 05.. Method of Vibration Analysis 06.. Application to a Centrifugal Compressor 0..5 Trouble Shooting in the Event of Centrifugal Compressor Vibration..6 Concluding Remarks 12.12 Application to Pumps (By H. Kanki) 12.12.1 Introduction 12.12.2 Bearings Installed in Pumps 1.12. Differences Between Pumps and Other Rotating Machines.. 1.12. Method of Design Study for Pump Bearings 1.12.5 Guidelines for Evalution 20.12.6 Concluding Remarks 22 XII