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Envelope enhancement system for detecting paper machine press section anomalous vibration measurements

  • US 5,679,900 A
  • Filed: 04/12/1995
  • Issued: 10/21/1997
  • Est. Priority Date: 12/08/1992
  • Status: Expired due to Term
First Claim
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1. In a paper machine felt press section, a fault detection system, comprising:

  • a sensor to sense signals representative of vibrations from said press;

    a feature extracting circuit having at least one band pass filter for receiving said signals and for separating and passing a limited predetermined range of harmonic frequencies from a small amplitude impulse perturbation in said signals indicative of a selected fault in said press, and an enveloping circuit to substantially square said signals passed by said band pass filter to enhance said small amplitude impulse perturbation; and

    an analyzer for receiving said signals from said enveloping circuit and indicating said selected fault in said press.

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