Acoustic monitoring of machinery
First Claim
1. A method of monitoring a machine, comprising:
- acquiring, by an acoustic sensor, acoustic signals from a vicinity of the machine, while the machine is operative;
calculating, by a processor, a frequency spectrum of a segment of the acquired acoustic signals;
determining boundaries of a frequency band to be analyzed;
extracting, from the calculated frequency spectrum, a base frequency window in the determined boundaries, and one or more harmonics windows of harmonics of the determined boundaries;
determining for each of the base and harmonic windows a weight based on a distribution of values of frequencies in the windows;
calculating a parameter of operation of the machine as a function of a weighted sum of the base and harmonic windows; and
evaluating operation of the machine, responsive to the calculated parameter.
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Accused Products
Abstract
Monitoring of a machine is performed by an acoustic monitor which acquires, through an acoustic sensor, acoustic signals from a vicinity of a machine, while the machine is operative. A processor calculates a frequency spectrum of a segment of the acquired acoustic signals, determines boundaries of a frequency band to be analyzed and extracts, from the calculated frequency spectrum, a base frequency window in the determined boundaries, and one or more harmonics windows of harmonics of the determined boundaries. For each of the base and harmonic windows a weight based on a distribution of values of frequencies in the windows is determined and a parameter of operation of the machine is calculated as a function of a weighted sum of the base and harmonic windows. The operation of the machine is evaluated responsive to the calculated parameter.
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Citations
20 Claims
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1. A method of monitoring a machine, comprising:
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acquiring, by an acoustic sensor, acoustic signals from a vicinity of the machine, while the machine is operative; calculating, by a processor, a frequency spectrum of a segment of the acquired acoustic signals; determining boundaries of a frequency band to be analyzed; extracting, from the calculated frequency spectrum, a base frequency window in the determined boundaries, and one or more harmonics windows of harmonics of the determined boundaries; determining for each of the base and harmonic windows a weight based on a distribution of values of frequencies in the windows; calculating a parameter of operation of the machine as a function of a weighted sum of the base and harmonic windows; and evaluating operation of the machine, responsive to the calculated parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An acoustic machine monitor, comprising:
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an acoustic sensor for acquiring acoustic signals from a vicinity of a machine, while the machine is operative; and a processor configured to calculate a frequency spectrum of a segment of the acquired acoustic signals, to determine boundaries of a frequency band to be analyzed, to extract from the calculated frequency spectrum, a base frequency window in the determined boundaries, and one or more harmonics windows of harmonics of the determined boundaries, to determine for each of the base and harmonic windows a weight based on a distribution of values of frequencies in the windows, to calculate a parameter of operation of the machine as a function of a weighted sum of the base and harmonic windows, and to evaluate operation of the machine, responsive to the calculated parameter. - View Dependent Claims (10)
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11. A method of monitoring a machine, comprising:
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acquiring, by an acoustic sensor, acoustic signals from a vicinity of the machine, while the machine is operative; calculating, by a processor, a frequency spectrum of a segment of the acquired acoustic signals; calculating a ratio between power in one or more frequency segments of the frequency spectrum and a power of the frequency spectrum at least in the frequencies outside the one or more segments; and evaluating operation of the machine, responsive to the calculated ratio. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification