Oscillatory motions arising from unbalance, misalignment, wear, fatigue, and other malfunctions can be sensed in such a manner as to produce electrical signals representative of the disturbance concerned. Such analogues can be related to the "health" of the component of machine. Techniques exist to relate signal identity and deterioration. Vibration pick-ups are effective over different frequency ranges; proximity sensors operate best at low frequencies; seismic transducers have a preferred middle-frequency range; piezo-electric pick-ups are most effective at the higher frequencies. There is some argument as to the precisely acceptable frequency range. Sensor location and the source-to-sensor path also influence the resulting signal. The same and additional difficulties exist with microphones. Methods used to refine and improve signal processing are continually being developed, and the Author discusses three: signal averaging, cepstrum analysis, and signal reversing. These are not the sole techniques and the Author has therefore established the UK Mechanical Health Monitoring Group as a means of bringing interested persons together to compare experiences and discuss techiques. Order from: BSRA No. 48,674.

  • Corporate Authors:

    Trade and Technical Press, Limited

    Crown House
    Morden, Surrey SM4 5EW,   England 
  • Authors:
    • Collacott, RSA
  • Publication Date: 1978-3

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00179644
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Sep 14 1978 12:00AM