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Method and apparatus for operating a gas turbine engine

  • US 8,818,683 B2
  • Filed: 04/21/2006
  • Issued: 08/26/2014
  • Est. Priority Date: 04/21/2006
  • Status: Expired due to Fees
First Claim
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1. A method for operating a gas turbine engine, said method comprising:

  • detecting a change in a rotational speed of a rotor assembly based on a signal transmitted from at least one speed sensor, wherein the change in rotational speed persists for at least a specified period;

    comparing the detected change in rotational speed to a threshold speed range;

    generating a first output when the detected change in rotational speed exceeds the threshold speed range for a first predetermined duration, wherein the first output is at least one of an audio and a visual indication alerting a user;

    identifying, based on the first output, the occurrence of an engine impulse event;

    detecting the vibration level of the rotor assembly based on a signal transmitted from at least one sensor;

    comparing the detected vibration level to a predetermined amplitude vibration threshold range and a predetermined vibration duration threshold range, wherein the predetermined vibration duration threshold range is determined using vibration data collected from at least one gas turbine engine during a plurality of flights; and

    generating a second output when the detected vibration level exceeds the predetermined vibration amplitude threshold range for a period of time that exceeds the predetermined vibration duration threshold range to identify a gas turbine engine impulse event.

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