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Apparatus for analysing the condition of a machine having a rotating part

  • US 10,330,523 B2
  • Filed: 01/29/2016
  • Issued: 06/25/2019
  • Est. Priority Date: 01/18/2010
  • Status: Active Grant
First Claim
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1. A system for detecting an operating condition of a bearing associated with a shaft of a machine, wherein the shaft rotates at a speed of rotation during operation of the machine, and wherein the bearing includes a rolling element placed between an outer race bearing surface and an inner race bearing surface so that, when the shaft rotates, the rolling element moves between said outer and inner race bearing surfaces thereby causing mechanical vibrations, the system comprising:

  • a sensor configured to generate an analog measurement signal responsive to the mechanical vibrations, wherein the sensor is located on a body of the machine at a measurement point where the sensor is responsive to the mechanical vibrations emanating from rotation of the shaft with respect to the bearing;

    an analog-to-digital converter configured to receive the analog measurement signal as input and generates a digital measurement data signal corresponding to the analog measurement signal, said digital measurement data signal comprising a plurality of sample values at an associated sample frequency; and

    a processor device, in communication with the analog-to-digital converter, configured to;

    detect peak amplitude values in said digital measurement data signal during a finite time period, said finite time period corresponding to a number of revolutions of said shaft, said number of revolutions being greater than one;

    sort said detected peak amplitude values into a plurality of amplitude ranges;

    generate a representative peak amplitude value based on said sorted peak amplitude values and said number of revolutions; and

    detect the operating condition of the bearing based on the generated representative peak amplitude value,wherein said representative peak amplitude value has a predetermined average occurrence frequency equal to or less than one per eight revolutions;

    wherein the processor device is further configured to generate said representative peak amplitude value based on;

    a detected occurrence frequency of at least two predetermined amplitude values, andsaid predetermined average occurrence frequency, andwherein said representative peak amplitude value has a higher amplitude than each one of said at least two predetermined amplitude values.

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