Page 10 - Rotating Machinery Pratical Solutions to Unbalance and Misalignment

Preface
Preface
Preface
Preface
Preface

t is the intent of this book to present both a theoretical and the practical
understanding of unbalance and misalignment in rotating equipment.
I I I I I These two conditions account for the vast majority of problems with
rotating equipment encountered in the “real world.” Numerous ex-
amples and solutions are inserted to assist in understanding the various
concepts.
Chapter 1 discusses vibration to provide a fundamental under-
standing of its characteristics, which are used to determine the opera-
tional integrity of rotating machinery. A section deals with determining
the criticality of equipment to provide a set of guidelines as to which
equipment needs to be more closely monitored. Finally, the chapter ends
with a discussion of how to take and record field vibration measure-
ments.
Chapter 2 details the relationships between the various vibration
characteristics to gain an understanding of the forces generated within
operating machinery when conditions of unbalance and misalignment
are present.
Chapter 3 deals with resonance and beat frequencies, and details
their sources and cures.
Chapter 4 discusses the various forms of unbalance that can be
present in rotating machinery. Many of these sources can be corrected
during inspections and when performing sound maintenance practices.
Chapter 5 presents both the single plane and dual plane methods
of balancing rotating equipment. A discussion of which method to em-
ploy is also presented. Also presented are methods of determining the
correct balancing weights and how to resolve them to locations where
they can be attached.
Chapter 6 deals with the three circle method of balancing slow
speed fans, where phase angles are difficult to obtain.
Chapter 7 discusses the various types of misalignment and how to
detect them through vibration analysis.
Chapter 8 outlines an advanced rim and face method of precision
alignment. Both graphical and calculator solutions are presented. Ther-

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