Routine Vibration Analysis

Applied Diagnostics Ltd - Precision with Pride

This predictive / proactive technology is applicable to the most diverse range of industrial equipment of any of the predictive techniques we offer. Vibration Analysis is mainly conducted on rotating machinery, with individual plant items marked and data sets recorded at regular intervals. Following the initial base lining survey, various data parameters can then be trended during subsequent visits.

The best manufacturers of portable vibration analysis equipment provide modules within their software to integrate and track the results of other predictive or proactive equipment, oil sample analysis or rotor balancing systems for example.

Vibration Analysis can identify the root cause of reoccurring equipment faults, and the solution of just one of these faults can in many cases recoup the capital cost of the equipment or service purchase.

Vibration Waveform Analysis

Vibration data is collected from either a magnet mounted or permanently fitted accelerometer transducer. This produces a ‘time waveform’ that is proportional to the vibration amplitude:

Fig. 1 Waveform Analysis Graph (click to enlarge)


Frequency Spectrum Analysis

The data analyser/collector is able to break the complex signal down into individual frequency components using a Digital Signal Processing technique call a Fast Fourier Transform. This produces a ‘frequency spectrum’ which allows diagnosis of specific problems:

Fig. 1 Frequency Spectrum (click to enlarge)



Trending of various vibration parameters allows the progression faults to me monitored. This allows the optimum life for components such as bearings to be achieved.

Fig. 2 Vibration Trending (click to enlarge)



Typically this technology is used to monitor:

  1. Motors
  2. Pumps
  3. Fans
  4. Gearboxes
  5. Turbines (Gas & Steam)
  6. Compressors
  7. Shaft Bearing Condition

The typical faults found using this technology include:

  1. Component Imbalance
  2. Misalignment (Angular & Offset)
  3. Mechanical Looseness
  4. Structural Looseness
  5. Rolling Element Bearing Wear
  6. Sleeve Bearing Wear
  7. Oil Whirl
  8. Oil Whip
  9. Pump Cavitations
  10. Drive Belt Defects
  11. System/Structural Resonances
  12. Process Related Fluctuations
  13. Electrical Problems
  14. Gear Defects