Bearing dynamic coefficients in rotordynamics : computation methods and practical applications / / Łukasz Breńkacz

• Autore: Breńkacz Łukasz
• Pubblicazione: Hoboken, New Jersey : , : Wiley, , [2021]; ©2021
• Descrizione fisica: 1 online resource (189 pages)
• Disciplina: 621.82
• Soggetto topico: Rotors - Dynamics
• Nota di contenuto: Cover -- Title Page -- Copyright Page -- Contents -- List of Figures -- List of Tables -- Preface -- Symbols and Abbreviations -- About the Companion Website -- Chapter 1 Introduction -- 1.1 Current State of Knowledge -- 1.2 Review of the Literature on Numerical Determination of Dynamic Coefficients of Bearings -- 1.3 Review of the Literature on Experimental Determination of Dynamic Coefficients of Bearings -- 1.4 Purpose and Scope of the Work -- Chapter 2 Practical Applications of Bearing Dynamic Coefficients -- 2.1 Single Degree of Freedom System Oscillations -- 2.1.1 Constant excitation Force -- 2.1.2 Excitation by Unbalance -- 2.1.3 Impact of Damping and Stiffness -- 2.2 Oscillation of Mass with Two Degrees of Freedom -- 2.3 Cross-Coupled Stiffness and Damping Coefficients -- 2.4 Summary -- Chapter 3 Characteristics of the Research Subject -- 3.1 Basic Technical Data of the Laboratory Test Rig -- 3.2 Analysis of Rotor Dynamics -- 3.3 Analysis of the Supporting Structure -- 3.4 Summary -- Chapter 4 Research Tools -- 4.1 Test Equipment -- 4.2 Test.Lab Software -- 4.3 Samcef Rotors Software -- 4.4 Matlab Software -- 4.5 MESWIR Series Software (KINWIR, LDW, NLDW) -- 4.6 Abaqus Software -- Chapter 5 Algorithms for the Experimental Determination of Dynamic Coefficients of Bearings -- 5.1 Development of the Calculation Algorithm -- 5.2 Verification of the Calculation Algorithm on the Basis of a Numerical Model -- 5.3 Results of Calculations of Dynamic Coefficients of Bearings -- 5.4 Summary -- Chapter 6 Inclusion of the Impact of an Unbalanced Rotor -- 6.1 Calculation Scheme -- 6.2 Definition of the Scope of Identification -- 6.3 Results of the Calculation of Dynamic Coefficients of Bearings Including Rotor Unbalance -- 6.4 Summary -- Chapter 7 Sensitivity Analysis of the Experimental Method of Determining Dynamic Coefficients of Bearings. ; 7.1 Method of Carrying Out a Sensitivity Analysis -- 7.2 Description of the Reference Model -- 7.3 Influence of the Stiffness of the Rotor Material -- 7.4 Influence of Uneven Force Distribution on Two Bearings -- 7.5 Changing the Direction of the Excitation Force and its Effect on the Results Obtained -- 7.6 Eddy Current Sensor Displacement Impact Assessment -- 7.7 Calculation Results for an Asymmetrical Rotor -- 7.8 Summary -- Chapter 8 Experimental Studies -- 8.1 Software Used for Processing of Signals from Experimental Research -- 8.2 Software Used for Calculations of Dynamic Coefficients of Bearings -- 8.3 Preparation of Experimental Tests -- 8.4 Implementation of Experimental Research -- 8.5 Processing of the Signal Measured During Experimental Tests -- 8.6 Results of Calculations of Dynamic Coefficients of Hydrodynamic Bearings on the Basis of Experimental Research -- 8.7 Verification of Results Obtained -- 8.8 Summary -- Chapter 9 Numerical Calculations of Bearing Dynamic Coefficients -- 9.1 Method of Calculating Dynamic Coefficients of Bearings -- 9.2 Calculation of Dynamic Coefficients of Bearings Using a Method with Linear Calculation Algorithm -- 9.3 Calculation of Dynamic Coefficients of Bearings Using a Method with Non-linear Calculation Algorithm -- 9.4 Verification of Results Obtained -- 9.5 Summary -- Chapter 10 Comparison of Bearing Dynamic Coefficients Calculated with Different Methods -- Chapter 11 Summary and Conclusions -- Appendix A -- A.1 Fast Fourier Transform Diagrams of Journal Displacement in Relation to Bearing Housings -- A.2 Journal Vibration Trajectories in Relation to Bearing Housings -- A.3 Acceleration of Vibrations of Bearing Supports during Start-up -- A.4 Rotor Axial Alignment Report -- Appendix B -- B.1 Fragments of Code of the Program Used for Processing the Signal from Experimental Tests -- Appendix C. ; C.1 Journal Vibration Trajectories Calculated in KINWIR and LDW Software -- C.2 Journal Vibration Trajectories Calculated in NLDW Software -- Research Funding -- References -- Index -- EULA.
• Sommario/riassunto: "The analysis of dynamic properties of rotating machinery has for many years been the subject of numerous research works carried out in many scientific centers. From modern day rotating machinery it is required to work with increasingly difficult operating parameters while maintaining a light and compact design. Increased efficiency, reliability and precision are also required. Rotating machinery with hydrodynamic bearings are used in many sectors of the economy, e.g. energy, transport, aviation and military. Very often they are a key element of large technical objects. In steam turbines used for energy conversion, one of the key components are hydrodynamic plain bearings. These machines are referred to as "critical machinery", i.e. they are required to be immensely reliable. Unplanned downtime due to poor technical condition leads to significant financial losses. They are therefore monitored and thoroughly analyzed."--
• Titolo autorizzato: Bearing dynamic coefficients in rotordynamics
• ISBN: 1-5231-5513-2; 1-119-75924-2; 1-119-75928-5; 1-119-75917-X
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Lingua di pubblicazione: Inglese
• Record Nr.: 9910830773803321
• Lo trovi qui: Univ. Federico II
• Serie: Wiley-ASME Press