this book is the result of over 20 years of research and development in vibration analysis. This hardbound volume contains 6 chapters and 375 pages of analytical descriptions of how frequencies are calculated, generated, measured and analyzed. These analytical descriptions are supported by empirical measurements of actual case histories. The new edition features review questions at the end of each chapter.
Chapter 1 - Introduction to Machinery Vibration
Harmonic, periodic, random motion
Relationship between time and frequency
Amplitude measurement
Generated and excited frequencies
Frequencies caused by electronic phenomena
Forcing function
Mixing frequencies
Electrical and mechanical relationships
Time and frequency domain
Relationship between velocity, displacement and acceleration
Chapter 2 - Time and Frequency Analysis Techniques
Basic physics
Single frequency and harmonics
Phase relationships; clipping; truncation
Natural/multiple frequencies
High frequency riding a low frequency
Amplitude and frequency modulation
Sum and difference frequencies
Pulses
Chapter 3 - Accurate Evaluation of Machinery Condition
Introduction/Theory
Speed adjusted sensitivity
Data collection
Transducer selection
How to identify imbalance; bent shaft; soft foot; looseness; horizontal, vertical, offset, and angular misalignment; noise; resonance; rubs; oil whirl
Electric motor analysis; out-of-magnetic center; broken rotor bars; turn to-turn shorts; siren effect
Steam turbines
Pumps, starvation and cavitation
Special tests; start-up/coast down; bump tests; noise recording; synchronous time averaging (STA); relative motion measurements (RMM)
Chapter 4 - Accurate Diagnosis of Antifriction Bearings
Data collection and transducer selection
Frequency calculation; FTF with either race rotating; BPFO; BPFI; 2 x BSF
How to identify defects on inner and outer race; multiple defects; defect severity; nature of defect; deep fatigue spalls; shallow flaking; frosting; acid etching/corrosion; fluting
Defects on balls/rollers and cage
Inadequate lubrication
Looseness; excessive internal clearance; turning on the shaft; loose in the housing
Chapter 5 - Accurate Evaluation of Gears
Transducer selection
Gear vibration theory
Gearmesh frequency; harmonics and subharmonics
Hunting tooth frequency
Planetary gears
Gear life expectancy
How to identify eccentric gears; out-of-round; bent shaft; loose; worn; misaligned; backlash problems; oscillating gears; broken, cracked or chipped teeth
Chapter 6 - Analyzing and Solving Press Roll and Nip Problems
Vibration theory
Hardware/software
Synchronous time averaging
Hardware setup
Dynamic measurement rolls
How to identify eccentric rolls
Improper roll ratios
Resonant frequencies
Improperly ground rolls
Data collection and analysis of overall vibration data
Relative motion between rolls
Dynamic measurement of steel rolls
