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Digital signal processing of encoder signals to detect resonances in rotating machines

  • US 5,501,105 A
  • Filed: 08/15/1994
  • Issued: 03/26/1996
  • Est. Priority Date: 10/02/1991
  • Status: Expired due to Fees
First Claim
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1. A method for analyzing the torsional and bending vibration of a rotary machine comprising the steps of:

  • a) acquiring at least one raw signal representative of the instantaneous rotational velocity of at least one shaft of said rotary machine;

    b) conditioning said raw signal to produce conditioned signals;

    c) digitizing said conditioned signals at an initial rate greater than required by the Nyquist criterion to produce initial digital signals and forming initial digital records therefrom each comprised of a portion of said initial digital signal;

    d) processing said initial digital signal records to produce an enhanced signal wherein selected torsional vibration components are enhanced and other signal components are reduced;

    e) averaging said enhanced signals so to remove selected random signal components; and

    f) analyzing said averaged enhanced signals to determine the torsional and bending vibration parameters of said rotary machine.

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