Journal-Bearing Databook
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1 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
2 Nomenclature 1. Introduction (By T. Someya) 1.1 General Information Types of Journal Bearings Main Dimensions of Journal Bearings 1.1. Coordinates for Journal Bearings 1.1. Assumptions in the Databook 1.2 Static Characteristics of Journal Bearings Equilibrium Position of Journal Centre Frictional Coefficient of Journal Bearings 1.2. Oil Flow of Journal Bearings 1.2. Heat Balance in Journal Bearings 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 Determination of Coefficients of Oil Film by Experiment 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 Some Notes on Application of the Data References XIII Calculated Data 1 Calculation Type of L.D m n Remarks P- 1 2 Axial grooved cylindrical Axial grooved cylindrical.. 0 Axial grooved cylindrical.. 0 Axial grooved cylindrical Pressure dam cylindrical Partial arc.. 7 Partial arc... 8 Partial arc... Partial arc... 2 Lobe Lobe 2/ / 2/ / 120 c 1 c 120 c 1 c IX
3 Calculation Type of L :D m p Remarks P- 17 Lobe 18 Lobe Lobe 20 Lobe 21 Lobe 22 Lobe 2 Lobe 2 Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad.... Pad tilting pad.... Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad.... Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad _. 5 Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Pad tilting pad Hydrostatic 57 Spherical spiral grooved 58 Taper spiral grooved 5 Flat spiral grooved.. 2/... /... / /... /... / 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 Experimental Data 11 Test no. Type of Diameter D(mm) Length L(mm) Radial clearance C p, Q(mm) Remarks P- 1 circular X
4 Test no. Type of Diameter D(mm) Length L(mm) Radial clearance C p,c b (mm) Remarks P circular circular circular circular 2 lobe 2 lobe 2 lobe pad tilting pad 5 pad tilting pad 5 pad tilting pad C p = C b = 0.0 C p = 0. C b = 0.1 C p = C b = C p = C fc = 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 Explanations 21.1 Method of Calculation for Bearing Characteristics (By J. Mitsui) Generalized Reynolds Equation for Laminar Flow Reynolds Equation for Turbulent Flow Method of Calculation for Reynolds Equation 2.1. Boundary Condition for Oil Film Pressure Calculation of Static Bearing Characteristics Method of Calculation for Dimensionless Stiffness and Damping Coefficients of Oil Film 27.2 Methods of Measurement for Journal Bearing Characteristics (By J. Esaki) Outline of Performance Characteristic Tests of Journal Bearing Methods of Measurement for Oil Film Coefficients 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) Estimation from Calculated Data Estimation from Measured Data 2 XI
5 . Boundary Condition for Oil Film Pressure Distribution (By Y. Kanemitsu) 2.5 Influences of Length: Diameter Ratio on Journal Bearing Characteristics (By J. Esaki) Influences of Turbulent Flow on Journal Bearing Characteristics (By J. Esaki) Analysis of Bearing Characteristics with Due Consideration for Viscosity Variation (By J. Mitsui) Thermohydrodynamic Lubrication Theory Examples of Temperature Distribution in the Bearing Bush Bearing Characteristics Calculated by THD Theory 27.8 Unbalance Response of Rotors in Journal Bearing (By T. Iwatsubo) Introduction Equation of Motion Unbalance Response Unbalance Vibration Mode Numerical Calculation of Unbalance Response Damping Effect of Bearing Application to a Complicated System Summary 287. Stability of Rotors Supported by Plain Bearings (By M. Tanaka) Introduction Oil Whip Phenomenon Theory of Oil Whip 28.. Occurrence and Growth of Oil Whip Stability Criterion for Generalized Rotor-Bearing-System Stabilization Measures Flow-Induced Vibration 2. Application to Steam Turbine Generator (By S. Hisa) Introduction Bearing Types and Operating Conditions 25.. Unbalance Response 27.. Self-Excited Vibration 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 Application to Pumps (By H. Kanki) Introduction Bearings Installed in Pumps Differences Between Pumps and Other Rotating Machines Method of Design Study for Pump Bearings Guidelines for Evalution Concluding Remarks 22 XII
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