Noninvasive method and apparatus for determining resonance infor

Details Noninvasive method and apparatus for determining resonance infor Noninvasive method and apparatus for determining resonance infor

1991-10-02

1994-11-22

Snow, Walter E.

Measuring and testing

Vibration

Sensing apparatus

324226, 32420725, 340683, G01H 100, G01H 1100, G08B 2300, G01N 2900

Patent

active

053657870

ABSTRACT:
The present invention provides a method and system for analyzing signals generated by rotating components that slip in a rotating machine and for detecting faults in those components. Pulses from a shaft encoder serve as an external clock in digitizing the signal data. A fixed number of data samples are thereby acquired for each complete rotation of the rotating shaft of the machine. Complex spectra are provided for data records of a fixed length with the first sample of each data record always beginning at the same point relative to the shaft angular orientation. Signal-processing means multiply pairs of signal spectral components so that the complex products produced by the data for the component of interest has a fixed phase relative to the shaft orientation. The resulting signal is then shaft synchronously averaged over a large data set so that the sum of the spectral signal components for the rotating component of interest converges to finite constant values whereas other signal contributions tend toward zero. This signal function average is analyzed for the presence of component faults and other attributes. This method and system is capable of analyzing and detecting defects in slipping machine-components, even in the presence of high background noise that would normally prevent such analysis.

REFERENCES:
patent: 4426641 (1984-01-01), Kurihara et al.

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