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A vibration detector. A machine, such as a gas turbine engine, contains a rotor bearing and a gear. A nearby sensor produces a train of pulses as teeth of the gear travel past. The frequency of the pulse train indicates rotational speed of the rotor. In addition, vibration of the rotor causes the ge

A vibration detector. A machine, such as a gas turbine engine, contains a rotor bearing and a gear. A nearby sensor produces a train of pulses as teeth of the gear travel past. The frequency of the pulse train indicates rotational speed of the rotor. In addition, vibration of the rotor causes the gear to orbit about another center. The orbiting causes amplitude modulation, frequency modulation, or both, in the pulse train. Detection of the modulation indicates the presence of vibration. Thus, a single pulse train, produced by a single sensor, is used to indicate both speed, and the presence of vibration.

대표청구항

1. Method of operating a machine, comprising:a) deriving a pulse train from a rotating component; and b) using the pulse train to i) compute rotational speed of the component; and ii) infer vibration in the component.

1. Method of operating a machine, comprising:a) deriving a pulse train from a rotating component; and b) using the pulse train to i) compute rotational speed of the component; and ii) infer vibration in the component.