Apparatus and method for analyzing the condition and performance of turbomachines by processing signals representing rotor motion
First Claim
1. A method for analyzing the condition and performance of turbomachines by processing signals representing rotor motion comprising the steps of:
- a) acquiring signals from a plurality of sensing elements which detect motion of a rotor wherein at least one of said sensing elements detects rotational motion;
b) isolating signal components representing the rotational vibration and translational vibration components of said rotor motion;
c) analyzing said signal components over time to determine the condition and performance of said turbomachine.
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Abstract
A method and device for processing encoder signals from turbomachines to produce frequency modulation signals representing fully isolated rotor vibrational resonances. Multi-sensor and multi-sideband group processing provides enhanced results. The method provides dramatically improved frequency resolution. Amplitude modulation and random noise effects are removed by a variety of artifact-free techniques. Signals then are completely separated into components for rotational vibration and translational vibration. Fully isolating rotational vibration unmasks previously undetectable signal components of diagnostic value. In cases of high background vibration, Wiener filtering removes the effects of exogenous vibration. By these various techniques, the present invention provides significantly enhanced diagnostic information regarding condition and performance in turbomachines.
46 Citations
19 Claims
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1. A method for analyzing the condition and performance of turbomachines by processing signals representing rotor motion comprising the steps of:
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a) acquiring signals from a plurality of sensing elements which detect motion of a rotor wherein at least one of said sensing elements detects rotational motion; b) isolating signal components representing the rotational vibration and translational vibration components of said rotor motion; c) analyzing said signal components over time to determine the condition and performance of said turbomachine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A device for detecting rotor vibrations and resonances in operating turbomachines comprising:
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sensor means for sensing motion of a rotor at various points around the circumference of said rotor, yielding a plurality of signals; conditioning means for conditioning and digitizing said signals to produce digital signals; processing means for processing said digital signals to produce resampled signals, and other output; analyzing means for determining the effects of sensor motion on said resampled signals and other output; and interface means for communicating results of said processing and determining to an operator. - View Dependent Claims (16, 17, 18, 19)
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Specification