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Diagnostic method, system and device for a rotorcraft drive system

  • US 10,424,134 B2
  • Filed: 08/15/2017
  • Issued: 09/24/2019
  • Est. Priority Date: 08/17/2016
  • Status: Active Grant
First Claim
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1. A method of diagnosing an anomaly of a monitored component in a drive train, the method comprising:

  • obtaining, by a device configured to diagnose an anomaly, original data based on samples of a vibration signal and a tachometer signal;

    generating, by the device configured to diagnose an anomaly, a time synchronous average vibration signal;

    processing, by the device configured to diagnose an anomaly, the time synchronous average vibration signal to produce a frequency-domain spectrum;

    determining, by the device configured to diagnose an anomaly, complex magnitudes of the frequency-domain spectrum;

    selecting, by the device configured to diagnose an anomaly, a sub-synchronous band of the complex magnitudes of the frequency-domain spectrum to generate a sub-synchronous spectrum;

    determining, by the device configured to diagnose an anomaly, a mean of the sub-synchronous spectrum to generate a condition indicator;

    determining a plurality of condition indicators;

    based upon the plurality of condition indicators, determining an unhealthy condition of the plurality of condition indicators;

    identifying an unhealthy component; and

    adjusting at least one of operation and maintenance of the unhealthy component.

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