[특허]Method and apparatus for isolating and identifying periodic Doppler signals in a turbine

Method and apparatus for isolating and identifying periodic Doppler signals in a turbine 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01N-029/12
출원번호	US-0234192 (1994-04-28)
발명자 / 주소	Lang George F. (Lansdale PA) Leon Robert L. (Maple Glen PA)
출원인 / 주소	Electric Power Research Institute (Palo Alto CA 02)
인용정보	피인용 횟수 : 38 인용 특허 : 0

초록 ▼

An improved method and apparatus for detecting and identifying one or more resonantly vibrating blades of a turbine through the use of acoustic sensors imbedded in the stationary casing of the turbine is disclosed. The acoustic sensor signals are processed to separate the characteristic Doppler waveform from the accompanying random noise and periodic noise. Improved signal processing techniques which involve the evaluation of both an information-bearing resonant signal and its Hilbert transform via direct synthesis are disclosed.

대표청구항 ▼

An apparatus for detecting a resonantly vibrating blade in a row of blades secured to a shaft rotating about a rotor axis, in an operating turbine, comprising: an acoustic sensor positioned on a stationary member with respect to said shaft to receive sound waves emanating from said rotating blades as said blades rotate about said rotor axis and to provide an output signal representative said received sound waves, said acoustic sensor positioned with respect to said shaft so that said vibrating blade approaches and departs from said acoustic sensor in the course of one rotation of said shaft about said rotor axis; reference means for obtaining a reference signal indicative of shaft position at least once each time said shaft completes a revolution about said rotor axis and for determining shaft speed; sampling means for sampling said sensor output signal to obtain samples related to shaft position as said shaft completes a multiplicity of revolutions at a plurality of different shaft speeds; first memory means for temporarily storing the shaft speed from the reference means and a corresponding plurality of samples synchronized with the shaft position obtained by said sampling means, said plurality of samples together comprising a sample series representing at least one shaft rotation; ensemble averager means for averaging multiple sample series to develop a plurality of synchronous ensemble averages differentiated by shaft speed; second memory means for storing the plurality of synchronous ensemble averages differentiated by shaft speed, and an accompanying shaft speed histogram; Fourier decomposition means for generating a plurality of complex order-normalized spectra differentiated by shaft speed from the synchronous ensemble averages stored in the second memory means, each complex order-normalized spectrum having a real component and an imaginary component; curve fitter means for curve fitting the plurality of complex order-normalized spectra using the shaft speed histogram as a weighting function to generate a series of generally linear shaft speed functions fit to the real and imaginary Fourier coefficients of the complex order-normalized spectra, wherein for a linear curve fit, the Fourier slope coefficients represent a characteristic Doppler signal and the Fourier intercept coefficients represent periodic background noise; and synthesis means for constructing a resonant signal characterizing the vibration of the resonantly vibrating blade from the generally linear shaft speed functions generated by the curve fitter means, an instantaneous amplitude thereof being used to identify the resonantly vibrating blade in the monitored row of blades.

이 특허를 인용한 특허 (38)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Method and apparatus for isolating and identifying periodic Doppler signals in a turbine 원문보기

초록 ▼

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Method and apparatus for isolating and identifying periodic Doppler signals in a turbine 원문보기

초록 ▼

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연구과제 타임라인

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이 특허를 인용한 특허 (38)

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