Method and apparatus for diagnosing mechanical problems, particu

Details Method and apparatus for diagnosing mechanical problems, particu Method and apparatus for diagnosing mechanical problems, particu

1994-11-22

1996-12-10

Bahr, Jennifer

Tobacco

Cigar or cigarette making

131 841, 131108, A24C 514

Patent

active

055821928

ABSTRACT:
In a machine having rotating components, in which a substance is processed in continuous form, a sensor generates signals representative of the instantaneous supply rate of the substance at one or more selected locations in the machine. A processor performs a Fast Fourier Transform (FFT) analysis on such signals, to determine the amplitude harmonic value at each frequency over a spectrum of frequencies. The measured FFT values are compared to reference values at the corresponding frequencies in order to identify out-of-spec values and generate an error signal. Preferably also, the processor matches the frequency corresponding to the out-of-spec amplitude to a corresponding harmonic frequency value of one of the rotating machine components.

REFERENCES:
patent: 4697603 (1987-10-01), Steinhauer et al.
patent: 4926886 (1990-05-01), Lorenzen et al.
patent: 5125418 (1992-06-01), Siems
patent: 5132897 (1992-07-01), Allenberg
patent: 5170358 (1992-12-01), Delio
patent: 5230316 (1993-07-01), Ichihara et al.

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