Vibration Analysis AddOn

vibration_kl.JPGThe vibration analysis serves to evaluate vibration measurement data which have been measured using an activated sensor QS3.
The vibration analysis “listens” into the machine. Every component oscillates differently, generating a characteristic sound which leaves a typical fingerprint in the spectrum. If there is damage, a pattern emerges from the background noise. From this, a specialist will be able to recognise  for example,  if there is an imbalance, an alignment problem or a damaged  bearing. Apart from a reliable diagnostic, it can normally also be estimated whether prompt action is required or if it can wait until the next planned revision.
 
 
 
 
Obvious Advantages For Lift Operators And Maintenance Personnel:
  • Identification of machine errors
  • Information about error causes
  • Localisation of components affected
  • Optimisation of spare parts inventory
  • Planning of maintenance
The characteristic  A95, PktoPK and 0toPK values are specifically determined on the three spatial axes  in accordance with ISO18738, with the highest amplitudes and corresponding frequencies measured in the three directions of acceleration. Furthermore, the function of a square Cepstrum is included.
  
Carrying Out Vibration Measurements
 
platte_seite.JPGIn order to carry out measurement, the sensor QS3 is attached to a component of the machine in a suitable position. While doing so, pay attention to a good connection of the sensor to the component. In many cases, the use of the supplied magnetic base, providing an optimal contact through its magnetic surface, provides the easiest solution.
 
 
The Report
 
report.jpgThe characteristic A95, PktoPK and 0toPK values are specifically determined on the three spatial axes in accordance with ISO18738, with the highest amplitudes and corresponding frequencies measured in the three directions of acceleration.
 
Die Cepstrum Function
 
The Cepstrum function is an exclusive component of the vibration analysis AddOn.
The Cepstrum is the most important tool to analyse gear vibrations as well as harmonics and modulations. It highlights the harmonic structure of tooth vibrations and makes it possible to analyse periodic oscillations. This is achieved by means of a second fourier-transformation which uses the values of the spectrum as an input signal.

cepstrum.jpg
Even under normal conditions, gears show relatively strong vibrations. Damages are often noticeable due to an increase in harmonic oscillations, which not be detected with a normal evaluation. The Cepstrum presentation represents an easy possibility to the reduce data to the bare essentials.
Handling of the Cepstrum data depends on the concrete objectives:
  • For trend analyses, it makes sense to save the values obtained and to present their development over long time periods.
  • For automatic machine monitoring, a classification into configurable thresholds or limits is advisable.
 
 
06.08.2016