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Machinery Vibration Signature Analysis

4 days MTM/PAVIB-E
Level
Advanced
Audience
  • Supervisors and technical staff involved in the inspection and maintenance of rotating equipment.
Purpose
  • To provide the tools for evaluating machinery operating problems.
  • To impart the knowledge and methods necessary for the organization and implementation of an efficient predictive maintenance program.
Learning Objectives
  • To explain the capacity and limitations of different types of measurement devices: sensors, analyzers, software, etc.
  • To recognize typical signatures of the most common mechanical defects.
  • To decide the kind of signal treatments to apply in order to produce evidence of a specific defect and evaluate its severity.
  • To implement a maintenance schedule for each machine, based on the type of machine and its importance in the production process.
Ways and means
  • Study of industrial situations.
  • Various illustrations of actual systems.
  • Use of professional measurement software and/or test benches (when available).
  • The practical approach makes the course suitable for full-time vibration specialists.

Basic definitions - Overall measurements 0.75 day
  • Frequency and amplitude.
  • Displacement, velocity, acceleration.
  • Different types of vibration: periodic, random, shocks.
  • Overall measurements: their limitations, severity charts, high frequency techniques for anti-friction bearings, practical recommendations.
Resonance 0.5 day
  • Simple system behavior: amplitude and phase.
  • Actual rotor and bearings systems.
  • Critical speeds.
  • Using phase to study resonance.
  • Identifying and solving problems.
Tools for diagnosis 0.5 day
  • FFT analyzers: Fourier transforms and actual plots
  • Accelerometers, fixation methods
  • Selecting analysis parameters: scales, units, windows
  • Using special functions: zoom, cepstrum, envelope detection
  • Using non-contacting probes for monitoring large machinery running on plain or tilt-pad bearings
Machinery defects and vibration signature 2 days
  • Unbalance.
  • Shaft and coupling misalignment.
  • Antifriction bearings - Typical defaults.
  • Plain or tilt pad bearings instabilities.
  • Mechanical looseness, cracks, friction between rotor and stationary parts.
  • Gears defaults.
  • Electromagnetic defects of induction electric motors.
  • Drive belt vibration.
Practical machinery vibration monitoring 0.25 day
  • Vibration control policy: machinery improvement program.
  • Different policies according to the type of machinery and its criticity.
  • Developing an effective program: cooperation between specialists, mechanics and operators.