Monitoring of vibration levels

The diagnosis of bearing damage in roller bearings is an integral part of servicing and maintenance tasks. Condition monitoring systems (CMS) are increasingly being used for machine diagnoses. Many CMS systems are based on vibration measurements. Two contrasting approaches exist: diagnostic, qualitative  approach (envelope spectrum); quantitative  approach (vibration velocity). Delphin's Expert Vibro Devices are suitable for both approaches. The quantitative approach integrates the acceleration time signal into vibration velocity. The vibration velocity is then usually monitored as a sum level. An Expert Vibro device is able to calculate an envelope spectrum from the time signals of acceleration sensors. it provides detailed information on the condition of the bearing (inner and outer rings, cage and ballbearings).

Application features

  • Evaluation of vibration velocity Veff according to DIN ISO 10816
  • FFT analysis within the device / frequency band monitoring
  • Evaluation using envelope spectrum on bearing damage
  • Monitoring of vibration levels
  • Intelligent recording within the device
  • Visualisation and analysis using time signal, trend spectrum, FFT cascade, orbit and polar diagrams

Practical example

Condition monitoring and machine diagnoses is especially important in ship drives. When at sea, the next "repair workshop" can be extremely difficult to reach. Bearings in ship drives are usually underwater and therefore difficult to access for diagnostic sensors. For this reason, acceleration signals are acquired at multiple locations above water and correlated with important process measurement values. Impending damage can then be detected at an early stage. Different designs of acceleration sensors are generally used. They feature high threshold frequencies and good resolution. Envelope spectrums can be portrayed and evaluated using the ProfiSignal software and the Vibro option.

Typical areas of application

  • Bearing damage diagnoses
  • Envelope spectrums
  • Analysis of vibrations in drives
  • Analysis of gearing problems
  • CMS on roller bearings

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