Practical_Machinery_Vibration_Analysis_and_Predictive_Maintenance

Preface vii
1 Predictive maintenance techniques:

Part 1 Predictive maintenance basics 1
1.1 Maintenance philosophies 1
1.2 Evolution of maintenance philosophies 4
1.3 Plant machinery classification and recommendations 5
1.4 Principles of predictive maintenance 6
1.5 Predictive maintenance techniques 7
1.6 Vibration analysis � a key predictive maintenance technique 8

2 Predictive maintenance techniques: Part 2 Vibration basics 11
2.1 Spring-mass system: mass, stiffness, damping 11
2.2 System response 12
2.3 What is vibration 13
2.4 The nature of vibration 14
2.5 Harmonics 18
2.6 Limits and standards of vibration 23

3 Data acquisition 29
3.1 Introduction 29
3.2 Collection of vibration signal � vibration transducers, characteristics and mountings 29
3.3 Conversion of vibrations to electrical signal 39
3.4 Conclusion 54

4 Signal processing, applications and representations 55
4.1 The fast Fourier transform (FFT) analysis 55
4.2 Time waveform analysis 64
4.3 Phase signal analysis 67
4.4 Special signal processes 69
4.5 Conclusion 88

5 Machinery fault diagnosis using vibration analysis 89
5.1 Introduction 89
5.2 Commonly witnessed machinery faults diagnosed by vibration analysis 89

6 Correcting faults that cause vibration 134
6.1 Introduction 134
6.2 Balancing 134
6.3 Alignment 145
6.4 Resonance vibration control with dynamic absorbers 164

7 Oil and particle analysis 168
7.1 Introduction 168
7.2 Oil fundamentals 169
7.3 Condition-based maintenance and oil analysis 172
7.4 Setting up an oil analysis program 175
7.5 Oil analysis � sampling methods 179
7.6 Oil analysis � lubricant properties 189
7.7 Oil analysis � contaminants in lubricants 196
7.8 Particle analysis techniques 201
7.9 Alarm limits for various machines (source: National Tribology Services) 219
7.10 Conclusion 220

8 Other predictive maintenance techniques 221
8.1 Introduction 221
8.2 Ultrasound 221
8.3 Infrared thermography 229
8.4 Conclusion 234
Appendix A: Exercises 235
Appendix B: Practical sessions 248
Index 252


Total 5 MB 264 pages

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Measuring Vibration

why do we measure vibration
where does it come from?
How to quantity the vibration level
The vibration parameters, Acceleration,Velocity and displacement
Measurement Units
Which paramoter to measure
Ths piezoelectric accelerometer
Practical accelerometer designs
Accelerometer lypes
Accelerometer characleristics
Accelerometer frequency rangs
Avoiding errors duo to accelerometer resonance
Choosing a mounting Position for the Accelerometer
How to mount the accolerometer
Environmental influences General
Environmentsl influences - Temperature
Environmenial influences - Cable Noise
Other Environmental influences
Accelerometer calibration
A simple calibrator
Force and impedance measurements
Logarithmic scales and decibels
Why us an Accelerometer preamplifier?
The vibraiion meter
What is frequency analYsis
Constant bandwidih or Constant percentage
bandwidth frequencY analYsis
Filter bandwidth considerations
Defining the filter bandwidth
Measuring instrumentation
Using vibration measurements
Vibration as a machine condition indicator.
Vibration trouble shooting charts
Vibration and the human bodY


Total 42 pages 6.5 mb

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