Rotordynamics

Rotordynamics

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Features

  • Provides consistent theory of rotor dynamic behavior based on simple modal models that are supported by practical identification procedures
  • Includes extensive references at the end of each chapter for more in-depth study of each topic
  • Demonstrates identification of modal models through a novel perturbation testing, with detailed discussion of the method for easy reproduction of the experiments
  • Contains hundreds of figures and tables, a glossary, an index, and numerous practical case studies that demonstrate diagnosis of specific malfunctions in rotating machines
  • Summary

    As the most important parts of rotating machinery, rotors are also the most prone to mechanical vibrations, which may lead to machine failure. Correction is only possible when proper and accurate diagnosis is obtained through understanding of rotor operation and all of the potential malfunctions that may occur. Mathematical modeling, in particular modal modeling, is key to understanding observed phenomena through measured data and for predicting and preventing failure.

    Rotordynamics advances simple yet adequate models of rotordynamic problems and phenomena related to rotor operation in its environment. Based on Dr. Muszy(n´)ska's extensive work at Bently Rotor Dynamics Research Corporation, world renowned for innovative and groundbreaking experiments in the field, this book provides realistic models, step-by-step experimental methods, and the principles of vibration monitoring and practical malfunction diagnostics of rotating machinery. It covers extended rotor models, rotor/fluid-related phenomena, rotor-to-stationary part rubbing, and other related problems such as nonsynchronous perturbation testing. The author also illustrates practical diagnoses of several possible malfunctions and emphasizes correct interpretation of computer-generated numerical results.

    Rotordynamics is the preeminent guide to rotordynamic theory and practice. It is the most valuable tool available for anyone working on modeling rotating machinery at the machine design stage or performing further analytical and experimental research on rotating machine dynamics.

    Table of Contents

    BASIC ROTORDYNAMICS: TWO LATERAL MODE ISOTROPIC ROTOR
    Introduction
    Mathematical Model of Two Lateral Mode Isotropic Rotor
    Eigenvalue Problem-Rotor Free Response-Natural Frequencies
    Rotor Static Displacement
    Rotor Nonsynchronous Vibration Response
    Unidirectional Harmonic, Nonsynchronous Excitation
    Rotor Synchronous Excitation Due to Unbalance Force
    Complex Dynamic Stiffness as a Function of Nonsynchronous Perturbation Frequency: Identification of the System Parameters. Nonsynchronous and Synchronous Perturbation
    Closing Remarks
    References
    VIBRATION MONITORING OF ROTATING MACHINERY
    Trends in Machinery Management Programs
    Trends in Vibration Monitoring Instrumentation
    Trend in the Knowledge on Rotating Machine Dynamics
    Rotating Machine Vibration Monitoring and Data Processing Systems
    Closing Remarks
    References
    BASIC ROTORDYNAMICS: EXTENDED ROTOR MODELS
    Introduction
    Rotor Modes
    Model of the Rotor with Internal Friction
    Isotropic Rotor in Flexible Anisotropic Supports: Backward Orbiting
    Anisotropic Rotor in Isotropic Supports
    Angular Momentum Model of an Isotropic Rotor
    Angular Momentum Model of an Anisotropic Rotor with Anisotropic Disk
    Model of Coupled Transversal and Angular Motion of the Isotropic Rotor with Axisymmetric Disk and Anisotropic Supports
    Model of Coupled Lateral Transversal and Lateral Angular Motion of an Anisotropic Rotor with Unsymmetric Disk
    Torsional and Torsional/Lateral Vibrations of Rotors
    Misalignment Model
    References
    FLUID-RELATED PROBLEMS IN ROTOR/STATOR CLEARANCES
    Introduction
    Fluid Whirl and Fluid Whip: Rotor Self-Excited Vibrations
    Mathematical Model of Fluid Forces in Rotor/Stator Clearances
    Response of Two Lateral Modes Isotropic Rotor with Fluid Interaction to Nonsynchronous Excitation. Introduction to Identification of Rotor/Fluid Characteristics
    Two Lateral Mode Fluid/Rotor Model Dynamic Behavior
    Model of a Flexible Rotor Supported by One Pivoting, Laterally Rigid and One Fluid-Lubricated Bearing
    Simplified Rotor/Seal and Rotor/Bearing Model and Its Solution
    Modal Perturbation Testing and Identification of Rotor/Fluid Film Characteristics
    Multimode Fluid Whirl and Fluid Whip in Rotor/Fluid Systems
    Parametric Study of Stability of Rigid Body Modes of a Rotor Supported in Two Fluid-Lubricating Bearings with Different Characteristics
    Comparison between "Bearing Coefficients" and "Bently/Muszynska" Model for Fluid-Lubricated Bearings
    Rotor Supported in a Poorly Lubricated Bearing: Experiments and Numerical Simulation of the Fluid/Dry Contact Interaction
    A Novel Analytical Study on the Rotor/Bearing or Rotor/Seal System Based on Reynolds Equations
    Physical Factors That Control Fluid Whirl and Fluid Whip and Other Pertinent Results of Research
    Fluid Force Model Adjustments
    References
    ROTOR-TO-STATIONARY PART RUBBING CONTACT IN ROTATING MACHINERY
    Many Phenomena Occurring During Rotor-to-Stationary Part Contacts in Rotating Machines and Pertinent Literature Survey
    Rotor/Seal Full Annular Rub Experimental Results
    Rotor-to-Stationary Part Full Annular Contact Modeling
    Rotor/Seal Full Annular Rub: Analysis
    Impact of Free Rotor Against a Retainer Bearing
    Partial Lateral Rotor-to-Stationary Part Rub
    Chaotic Responses of Unbalanced Rotor/Bearing/Stator Systems with Looseness and/or Rubs
    Thermal/Mechanical Effect of Rotor-to-Stator Rub
    References
    SELECTED TOPICS ON ROTORDYNAMICS
    Introduction to Balancing
    Dynamics of Anisotropically Supported Rotors
    Specifics of Damping Evaluation in Rotating Machines
    Stress in Rotating and Laterally Vibrating Machinery Rotors
    Rotor Crack Detection by Using Vibration Measurements
    Application of Multi-Mode Modal Models in Rotor Dynamics
    Rotor Lateral/Torsional Vibration Coupling Due to Unbalance-Free, Forced, and Self-Excited Vibrations
    Effect of Loose Rotating Parts on Rotor Dynamics
    Forward and Backward Orbiting of a Vertical Anisotropically Supported Rotor
    References
    VIBRATIONAL DIAGNOSTICS OF ROTATING MACHINERY MALFUNCTIONS ILLUSTRATED BY BASIC MATHEMATICAL MODELS OF THE ROTOR SYSTEM
    Introduction
    Diagnosis of Particular Malfunctions of Rotating Machines Illustrated by Basic Mathematical Models of the Rotor
    Advancement Trends in Vibration Monitoring and Diagnostics of Rotating Machinery Malfunctions
    References
    APPENDICES
    GLOSSARY
    INDEX

    Editorial Reviews

    "On balance, the book provides readers with ideas and concepts as well as with a software leading to an "expert system" and to further developments in research centers. It represents a valuable contribution to the field."
    -Peter P. Teodorescu, Zentralblatt MATH 1089

    ". . . well organised. Every chapter or major section starts with a brief but adequate introduction and literature review, and ends with a summary or closing remarks . . . This is a good textbook for graduate students, as well as a reference for engineers and researchers in the field of rotordynamics."

    – Zhuang Li, Spectra Quest, Inc., in International Journal of Acoustics and Vibration, March 2007, Vol. 12, No. 1

     
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