H Prashad, Bharat Heavy Electricals Limited (BHEL), India
ISBN 1 84569 110 5
ISBN-13: 978 1 84569 110 3
January 2006
264 pages 234 x 156mm hardback
£135.00 / US$255.00 / €170.00
- discusses improved machine performance
- examines factors affecting bearing reliability
- an essential reference for engineers
Solving Tribology Problems in Rotating Machines will be an essential reference for people involved in the design and operation of rotating machines in sectors such as power generation, the steel industry and electrical and automotive engineering
Bearings are widely used in rotating machines. Understanding the factors affecting their reliability and service life is essential in ensuring good machine design and performance. Solving tribology problems in rotating machines reviews these factors and their implications for improved machine performance.
The first two chapters review ways of assessing the performance and reliability of rolling-element bearings. The author then goes on to discuss key performance problems and the factors affecting bearing reliability. There are chapters on cage and roller slip, and particular types of failure in equipment such as alternators, condensers and pumps. The author also reviews the effects of such factors as localised electrical currents, seating, clearance, grades of lubricant, axial forces, vibration on performance and service life. The book concludes by reviewing ways of improving bearing design.
.Contents
Reliability Analysis of Rolling-Element Bearings
Detection of Bearing Malfunction and Determination of Defect Frequencies
Resonant Frequencies
Experimental Procedure
Instrumentation Details and Techniques
Determination of Defect Frequencies and Energy Levels
Functional Performance of Rolling-Element Bearings for Acceptance in Routine Applications
Bearing Test Philosophy
Bearing Test Machine
Experimental Procedure
Data Deduction
Results and Discussion
Overall Vibration Levels of Bearings
Predicted Life of Bearings
Comparison of Performance of Bearings
Cage and Roller Slip of Rolling-Element Bearings
Characteristic Defect Frequencies
Experimental Procedure
Spectral Analysis Technique
Determination of Defect Frequencies and Energy Levels
Results and Discussion
Comparison of Bearings
Diagnosis and Cause Analysis of Rolling-Element Bearings Failure in Electric Power Equipment
Bearing Arrangement and Nature of Bearing Failure
Investigations, Observation of Failures and Data Collection
Localized Electrical Current in Rolling-Element Bearings
Bearing Arrangement and the Nature of Bearing Failure
Investigations, Observations and Data Collection
Theoretical Model and Approach to Determine the Flow of Localized Current in a Bearing
Field Strength on Track Surfaces of Races and Rolling-Elements
Magnetic Flux Density
Determination of Time Span for the Appearance of Flutes on Track Surfaces
Response and Performance of a Rolling-Element Bearing Under the Influence of an Electric Current
Behaviour of Grease in Non-Insulated Bearings
Effect of Current on Formation of Corrugated Patterns on the Roller Track of Races of Roller Bearings
Effect of Current Leakage on Electro-Adhesion Forces in Rolling Friction and Magnetic Flux Density Distribution on Bearing Surfaces
Effect of Operating Parameters on the Threshold Voltages and Impedance Response of Non-Insulated Rolling-Element Bearings
Impedance, Capacitance and Charge Accumulation on Roller Bearings
Contact Temperature, Contact Stresses and Slip Bands Initiation on Roller Track of Races
Effects of Instantaneous Charge Leakage on Roller Tracks of Roller Bearings Lubricated with High-Resistivity Lubricants
Capacitive Effects of Roller Bearings on Repeated Starts and Stops of a Machine
Mechanism of Bearing Failures
Effect of Oil Grades and Clearance Ratios on the Reliability of Cylindrical Hydrodynamic Bearings
Theoretical
Evaluation of Viscosity Coefficients
Determination of Viscosity Integral
Assessment of Bearing Performance
Effect of Oil Grades on Temperature Rise and Safe Load-Carrying Capacity of Bearings
Bearing Turbulence and Transition Speed
Spherical Seating of Hydrodynamic Journal Bearings
Theoretical Basis of the Simplified Design Methodology
Evaluation of Minimum Values of Constant of Moment of Friction and Optimum Values of the Design Parameters of Spherical Seating
Functional Nomographs for Evaluation of Optimum Values for Spherical Seating Design Parameters
Guidelines for Choosing the Optimum Values for Spherical Seating Design Parameters
Life Estimation of Turbine Oils: A Methodology and Criterion for Accpetance or Rejection
Experimental Investigations
Data Deduction
Axial Force on Motor Bearings: A Tool For Performance Evaluation
Axial Force Measurement Technique
Experimental Determination of Axial Force
An Analysis of the Progressive Increase in Vibration of a Large Synchronous Electric Motor
Possible Sources of Vibration
Diagnosis of Causes of Vibration
System Design, Bearing Assembly and Characteristic Features of the Synchronous Motor Under Investigation
Investigations and Analysis
A Study of the Causes of Failure of Rolling-Element Bearings in Alternators
Design Features of the Alternators
The Nature of Bearing Failure
Data Collection and Investigations
Causes of Shaft Voltage and Flow of Current Through Bearings
The Diagnosis of the Cause of a Bearing Problem in a Synchronous Condenser
Technical Details of the Synchronous Condenser
Experimental Procedure
Measurement Obtained
Theoretical
Comparison of Theoretical and Experimental Data
The Cause of Noise at the Top Bearings of Vertical Pump-Motor Sets
Sump Layout and Construction
System Layout
System Behaviour
Factors Causing the Unusual System Behaviour
Vibration Spectra and Analysis
Results and Discussion
Design of the Bearing Used and its Significance
Explanation of the Cause of Noise at the Motor Top Bearing
Modifications to the Design and Bearings of Horizontal Axis Windmills Used for Pumping Water, to Achieve Trouble-free, Reliable Operation
Design Features
Operational Philosophy
Transmission System
Bearings and Performance of the Reciprocating Pump
Magnetic Suspension Bearings for AC Energy Meters
Design Considerations
Mechanical Requirements
Typical Construction
Frictional Torque Studies
A New Generation of Rolling-Element Bearing with an Outline of its Performance Advantages
Basic Concept and Principle of Operation of DDHPB
Theoretical Analysis
Theory Behind Performance Evaluation of Bearings
Design and Test Conditions of DDHPB
Bearing Test Set-up and Experimental Details for Testing DDHPB vis-a-vis Conventional Bearings
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