Machinery health monitoring (condition monitoring) of rotating machinery
(MHM 501)
- Introduction to Vibration and Sound Phenomena
- Terminology and definitions
- Concept of SDoF (single degree of freedom) systems; torsional equivalents
- Concepts of lumped and distributed parameters systems; mode shapes
- Practical machinery applications
- Principal sources of vibration and noise energy
- Data Acquisition and Recording
- Which one is the best sensor for my application: displacement, velocity,
acceleration, force, pressure or strain? - Selecting sensors, response characteristics and proper mounting
- Signal processing; selective frequency filtering
- Recording and signal storage; plotting
- Calibrating measurement and recording systems
- Which one is the best sensor for my application: displacement, velocity,
- Analog Sound and Vibration Analysis
- Constant percentage vs. constant bandwidth analyzers
- Manual tuning and logging
- Automatic tuning and plotting vs. frequency, at constant RPM
- Automatic tuning and plotting vs. vibration order (RPM varied)
- Averaging, waveform analysis, Lissajous orbits
- Waterfall displays; component tracking
- Computer Analysis of Sound and Vibration
- Frequency domain analysis of vibration and sound signatures
- Time domain analysis of vibration and sound signatures
- Demonstration of electronic transitions between domains
- Ranges and limitations of shaft and casing responses
- Data display and interpretation
- Baseline analysis; comparative analysis
- Changes reveal specific deterioration, e.g. rotational unbalance, misalignment, gears, bearings, belts, looseness, aerodynamic and hydraulic forces.
- Discussion of Case Histories
- Casing misalignment
- Unbalance response
- Oil whirl instability
- Gear signatures
- Incipient bearing failure
- Electric motor malfunction characteristics
- Turbine blade excitation
- Antifriction bearings
- Critical speed response tracking
- Discussion of student case histories, using participants’ tape
