Method and apparatus for diagnosing mechanical problems, particularly in cigarette makers
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United States of America Patent
Stats
-
Dec 10, 1996
Grant Date -
N/A
app pub date -
Nov 22, 1994
filing date -
Nov 22, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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