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Failure detection analyzer

  • US 4,320,662 A
  • Filed: 02/22/1978
  • Issued: 03/23/1982
  • Est. Priority Date: 02/22/1978
  • Status: Expired due to Term
First Claim
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1. An apparatus for providing measurements indicative of substantially, instantaneous absolute speed of a rotating element which is a member of a mechanical or electro-mechanical apparatus comprising:

  • (a) speed sensing means coupled to said rotating element and responsive to rotation thereof through indicative, small angles of revolution of said rotating element for generating a signal for each occurrence of small angle rotation thereof, said angles each being a fraction of a full-cycle of operation (i.e. one revolution);

    (b) means responsive to at least one said signal for providing an indication of one revolution of said rotating element;

    (c) signal processing means responsive to successive pair of said small angle rotation signals for providing elapsed time measurements between said small angles;

    (d) additional signal processing means for providing substantially, absolute speed indication measurements on a small angle signal by small angle signal basis from successive elapsed time measurements, the said absolute speed measurements being inversely proportional to the said elapsed time measurements and being expressed in dimensions of degrees per unit of time;

    whereby anomalies in said apparatus at sub-cyclic intervals may be detected.

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