Automated fault diagnosis device and method
First Claim
1. A method of diagnosing a fault in a machine by determining a periodic event related to the fault in the machine, the method comprising:
- (a) sensing vibration signals emanating from the machine,(b) transforming the vibration signals to produce first transformed signals,(c) transforming the first transformed signals to produce second transformed signals having at least real components, and(d) processing the first and second transformed signals using select criteria to determine the periodic event.
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Abstract
A diagnostic apparatus and method for sensing a signal emanating from a machine and determining a periodic machine event based on the emanated signal. The apparatus includes analog to digital processing components for digitizing the sensed signal, producing a digitized signal. The apparatus also includes a transform algorithm, memory, an analysis algorithm, and a display. The transform algorithm transforms the digitized signal to generate power spectral density and autocorrelation data which is stored in the memory. The analysis algorithm includes criteria for analyzing the stored power spectral density and autocorrelation data to determine a period machine event based at least in part upon the autocorrelation data. The display displays the periodic machine event to a user. In the event of a suspected defect or fault, the device alerts the user. The user may then elect to proceed with repairs or undertake advanced analysis of the suspected fault as economy dictates.
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Citations
23 Claims
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1. A method of diagnosing a fault in a machine by determining a periodic event related to the fault in the machine, the method comprising:
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(a) sensing vibration signals emanating from the machine, (b) transforming the vibration signals to produce first transformed signals, (c) transforming the first transformed signals to produce second transformed signals having at least real components, and (d) processing the first and second transformed signals using select criteria to determine the periodic event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A device for diagnosing a fault in a machine by determining a periodic event of the machine, the device comprising:
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a sensor for sensing a vibration signal emanating from the machine, the sensor operable to convert the sensed vibration signal into an electrical signal, signal processing components for digitizing the electrical signal to produce a digitized signal and for processing the digitized signal, and firmware including at least one transform algorithm for successively transforming the digitized signal to produce first and second sets of transform data, where the second set of transform data is a transform of the first set of transform data, and at least one analysis algorithm for analyzing the first and second sets of transform data to determine the periodic event based on select criteria applied to the first and second sets of transform data. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. An apparatus for diagnosing a fault in a machine, the apparatus comprising:
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a sensor for sensing a vibration signal emanating from the machine, analog to digital processing components for digitizing the sensed vibration signal to produce a digitized signal, at least one transform algorithm for transforming the digitized signal to generate power spectral density data and autocorrelation data from the digitized signal, memory for storing the power spectral density data and auto correlation data, at least one analysis algorithm for analyzing the power spectral density and autocorrelation data, the analysis algorithm including criteria for determining a periodic event of the machine based at least in part on the autocorrelation data, and a display for displaying the periodic event to a user. - View Dependent Claims (23)
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Specification