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Rotordynamics




ISBN 9780824723996
Published May 20, 2005 by CRC Press
1128 Pages - 746 B/W Illustrations

 
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Book Description

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

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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