Bearing Dynamic Coefficients in Rotordynamics

1 Introduction 11
 
1.1 Current State of Knowledge 13
 
1.2 Review of the Literature on Numerical Determination of Dynamic Coefficients of bearings 21
 
1.3 Review of the Literature on Experimental Determination of Dynamic Coefficients of Bearings 24
 
1.4 Purpose and Scope of the Work 29
 
2 Practical applications of bearing dynamic coefficients 34
 
2.1 Single-degree of freedom system oscillations 39
 
2.1.1 Constant excitation force 42
 
2.1.2 Excitation by unbalance 45
 
2.1.3 Impact of damping and stiffness 53
 
2.2 Oscillation of mass with two degrees of freedom 57
 
2.3 Cross-coupled stiffness and damping coefficients 61
 
2.4 Summary of Chapter 2 66
 
3 Characteristics of the Research Subject 68
 
3.1 Basic Technical Data of the Laboratory Test Rig 68
 
3.2 Analysis of Rotor Dynamics 72
 
3.3 Analysis of the Supporting Structure 81
 
3.4 Summary of Chapter 3 85
 
4 Research Tools 88
 
4.1 Test Equipment 89
 
4.2 Test.Lab Software 95
 
4.3 Samcef Rotors Software 96
 
4.4 Matlab Software 98
 
4.5 MESWIR Series Software (KINWIR, LDW, NLDW) 100
 
4.6 Abaqus Software 102
 
5 Algorithms for Experimental Determining of Dynamic Coefficients of Bearings 104
 
5.1 Development of the Calculation Algorithm 104
 
5.2 Verification of the Calculation Algorithm on the Basis of a Numerical Model 109
 
5.3 Results of Calculations of Dynamic Coefficients of Bearings 114
 
5.4 Summary of Chapter 5 118
 
6 Inclusion of the Impact of an Unbalanced Rotor 119
 
6.1 Calculation Scheme 120
 
6.2 Definition of the Scope of Identification 124
 
6.3 Results of Calculation of Dynamic Coefficients of Bearings Including Rotor Unbalance 126
 
6.4 Summary of Chapter 6 128
 
7 Sensitivity Analysis of the Experimental Method of Determining Dynamic

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.