| 摘要 |
PCT No. PCT/US80/01341 Sec. 371 Date Apr. 29, 1982 Sec. 102(e) Date Apr. 29, 1982 PCT Filed Oct. 10, 1980 PCT Pub. No. WO82/01416 PCT Pub. Date Apr. 29, 1982.A method and apparatus for detecting and identifying one or more excessively vibrating blades of the rotating portion of a turbomachine utilizing analysis of the characteristic Doppler waveform that results as the rotating, vibrating blade passes a fixed sensor. The acoustic energy in the vicinity of the rotating portion of the turbomachine is sensed to generate a composite electrical signal representative of the broadband acoustic spectrum. Then, through both time domain and frequency domain signal manipulations, the undesirable noise components of the composite signal are removed. The resulting signal is then displayed to reveal the characteristic Doppler waveform of the blade vibrations, which may be analyzed to indicate the location of the excessively vibrating blade as well as its relative vibration amplitude. Changes in the latter with time indicate the initiation or propagation of a blade crack.
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