Bearing Dynamic Coefficients in Rotordynamics: Computation Methods and Practical Applications

ISBN-13: 9781119759263 / Angielski / Twarda / 2021 / 192 str.

Lukasz Brenkacz

Spis treści

1 Introduction 111.1 Current State of Knowledge 131.2 Review of the Literature on Numerical Determination of Dynamic Coefficients of bearings 211.3 Review of the Literature on Experimental Determination of Dynamic Coefficients of Bearings 241.4 Purpose and Scope of the Work 292 Practical applications of bearing dynamic coefficients 342.1 Single-degree of freedom system oscillations 392.1.1 Constant excitation force 422.1.2 Excitation by unbalance 452.1.3 Impact of damping and stiffness 532.2 Oscillation of mass with two degrees of freedom 572.3 Cross-coupled stiffness and damping coefficients 612.4 Summary of Chapter 2 663 Characteristics of the Research Subject 683.1 Basic Technical Data of the Laboratory Test Rig 683.2 Analysis of Rotor Dynamics 723.3 Analysis of the Supporting Structure 813.4 Summary of Chapter 3 854 Research Tools 884.1 Test Equipment 894.2 Test.Lab Software 954.3 Samcef Rotors Software 964.4 Matlab Software 984.5 MESWIR Series Software (KINWIR, LDW, NLDW) 1004.6 Abaqus Software 1025 Algorithms for Experimental Determining of Dynamic Coefficients of Bearings 1045.1 Development of the Calculation Algorithm 1045.2 Verification of the Calculation Algorithm on the Basis of a Numerical Model 1095.3 Results of Calculations of Dynamic Coefficients of Bearings 1145.4 Summary of Chapter 5 1186 Inclusion of the Impact of an Unbalanced Rotor 1196.1 Calculation Scheme 1206.2 Definition of the Scope of Identification 1246.3 Results of Calculation of Dynamic Coefficients of Bearings Including Rotor Unbalance 1266.4 Summary of Chapter 6 1287 Sensitivity Analysis of the Experimental Method of Determining Dynamic Coefficients of Bearings 1317.1 Method of Carrying Out a Sensitivity Analysis 1337.2 Description of the Reference Model 1347.3 Influence of the Stiffness of the Rotor Material 1367.4 Influence of Uneven Force Distribution on Two Bearings 1377.5 Changing the Direction of the Excitation Force and its Effect on the Results Obtained 1417.6 Eddy Current Sensor Displacement Impact Assessment 1447.7 Calculation Results for an Asymmetrical Rotor 1467.8 Summary of Chapter 7 1498 Experimental Studies 1538.1 Software Used for Processing of Signals from Experimental Research 1568.2 Software Used for Calculations of Dynamic Coefficients of Bearings 1598.3 Preparation of Experimental Tests 1628.4 Implementation of Experimental Research 1668.5 Processing of the Signal Measured During Experimental tests 1728.6 Results of Calculations of Dynamic Coefficients of Hydrodynamic Bearings on the Basis of Experimental Research 1758.7 Verification of Results Obtained 1858.8 Summary of Chapter 8 1879 Numerical Calculations of Bearing Dynamic Coefficients 1919.1 Method of Calculating Dynamic Coefficients of Bearings 1919.2 Calculation of Dynamic Coefficients of Bearings Using a Method with Linear Calculation Algorithm 2029.3 Calculation of Dynamic Coefficients of Bearings Using a Method with Non-Linear Calculation Algorithm 2099.4 Verification of Results Obtained 2189.5 Summary of Chapter 9 22510 Comparison of Bearing Dynamic Coefficients Calculated with Different Methods 22811 Summary and Conclusions 235References 244List of important designations 257

O autorze

Aukasz BreDkacz is an Assistant Professor and Research Associate at the Institute of Fluid Flow Machinery, Polish Academy of Sciences in GdaDsk, Poland. His research foci are on machinery design, the analysis of bearing systems, computer simulations, and experimental diagnostics of rotating machinery.