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Order tracking signal sampling process

  • US 6,351,714 B1
  • Filed: 03/03/1998
  • Issued: 02/26/2002
  • Est. Priority Date: 03/03/1998
  • Status: Expired due to Term
First Claim
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1. A hand-held data collection and analyzing unit for collecting and analyzing vibration data induced by a rotating shaft, the unit comprising:

  • a first input adapted to receive an analog vibration signal representing vibrations related to the rotating shaft;

    a second input adapted to receive a reference signal representing a speed of the rotating shaft; and

    a digital processor configured to;

    convert the analog vibration signal into corresponding sets of digital vibration samples over fixed intervals of time;

    provide in response to the corresponding sets of digital vibration samples corresponding sets of output vibration samples over a selected one of the fixed intervals of time at a sample rate that varies as a function of variations in the speed of the rotating shaft during the selected fixed interval of time, and in response to a constant speed of the rotating shaft, an initial number of samples in each set of output vibrations samples less than the number of samples in a corresponding set of digital vibration samples; and

    collect a time waveform record in response to a plurality of the output vibration samples, the plurality of output vibration samples collected in the time waveform record having an output sample rate varying as a function of variations in the speed of the rotating shaft.

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