Page 6 - Rotating Machinery Pratical Solutions to Unbalance and Misalignment

Table of Contents
Table of Contents
Table of Contents
Table of Contents
Table of Contents
CHAPTER 1—INTRODUCTION ................................................................... 1
Frequency .................................................................................................. 3
Displacement ............................................................................................ 3
Velocity ...................................................................................................... 4
Acceleration .............................................................................................. 4
Phase .......................................................................................................... 5
Hooke’s Law ............................................................................................. 8
Vibration as a Diagnostic Tool ............................................................ 12
Identifying Critical Equipment ........................................................... 15
Recording Vibration Data .................................................................... 18

CHAPTER 2—DEVELOPING THE VIBRATION EQUATIONS ............ 21
List of Symbols ...................................................................................... 21
The Sine Function .................................................................................. 22
The Cosine Function ............................................................................. 24
Deriving Vibration Equations ............................................................. 27

CHAPTER 3—AND BEAT FREQUENCIES ............................................... 33
Resonance ................................................................................................ 33
Beat Frequencies .................................................................................... 40

CHAPTER 4—VIBRATION DUE TO UNBALANCE .............................. 43
Introduction ............................................................................................ 43
Types of Unbalance ............................................................................... 44
Couple Unbalance ................................................................................. 46
Sources of Unbalance ............................................................................ 50

CHAPTER 5—FIELD BALANCING ........................................................... 55
Introduction ............................................................................................ 55
Single Plane Balancing ......................................................................... 56
Law of Sine ............................................................................................. 61
Law of Cosine ........................................................................................ 62
Review ..................................................................................................... 63
Trial Weights and Force ....................................................................... 64
Cautions ................................................................................................... 66

v