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Machinery Vibration

4 days MTM/PAVIB-E
Level
Advanced
Audience
  • Supervisors and technical staff involved in the technical inspection and maintenance of rotating equipment.
Purpose
  • This course assesses the cause and evolution of mechanical failures by analysis of vibration signals.
  • It emphasizes the implementation of an efficient predictive maintenance program.
Learning Objectives
  • Upon completion of the course, participants will be able to:
  • explain the measurement devices: sensors, analyzers, software, etc,
  • recognize standard signatures of the most common mechanical failures,
  • decide the kind of signal treatments to apply, in order to understand failure details and evaluate its severity,
  • implement a maintenance plan for each machine based on the criticality.
Prerequisite
  • It is advised to have a basic mechanical knowledge or experience in vibration monitoring.
Ways and means
  • Study of industrial cases.
  • Various illustrations of actual systems.
  • Use a professional measurement software and/or test benches.
  • 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: 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 & 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 static parts. Gear failures.
  • 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 criticality.
  • Developing an effective program.