Acoustic signature analysis for a noisy enviroment
First Claim
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1. A method for testing a mechanical device comprising the steps of:
- locating the mechanical device at a test location;
operating the mechanical device;
sensing the sounds and/or vibrations coming from the mechanical device with a sensor;
filtering a signal from said sensor with a filter to highlight important frequencies;
rectifying a signal from said filter;
ascertaining harmonies and sideband levels of repeating signals previously filtered with a secondary filter; and
,comparing a signal from said secondary filter to a reference with comparing means in order to ascertain the operability status of the mechanical device.
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Abstract
A device for testing mechanical devices using acoustic signature analysis of the sonic signature of such devices by filtering out the frequencies of interest, recreating such frequencies from their respective harmonics, and then correlating the recreated frequencies to pre-determined known characteristics or parameters developed from valid devices to predict the long term operability of other unknown devices in a noisy environment like a factory or an airport wherein other sources of sound and/or vibration are present.
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Citations
25 Claims
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1. A method for testing a mechanical device comprising the steps of:
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locating the mechanical device at a test location; operating the mechanical device; sensing the sounds and/or vibrations coming from the mechanical device with a sensor; filtering a signal from said sensor with a filter to highlight important frequencies; rectifying a signal from said filter; ascertaining harmonies and sideband levels of repeating signals previously filtered with a secondary filter; and
,comparing a signal from said secondary filter to a reference with comparing means in order to ascertain the operability status of the mechanical device. - View Dependent Claims (2, 3)
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4. A method for testing a mechanical device comprising the steps of:
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locating the mechanical device at a test location; sensing sounds and/or vibrations coming from the mechanical device with a sensor; discarding random non-repeating sounds and/or vibrations; ascertaining harmonics and sideband levels of repeating signals previously filtered with a secondary filter; and
,comparing non-discarded output of said sensor to a reference with comparing means in order to ascertain the operability status of the mechanical device. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method for testing a mechanical device comprising the steps of:
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locating the mechanical device at a test location; operating the mechanical device; sensing sounds and/or vibrations coming from the mechanical device with a sensor; discarding random non-repeating sounds and/or vibrations; filtering a signal from said sensor to highlight important frequencies; rectifying a signal from said filter with a rectifier; ascertaining harmonics and sideband levels of repeating signals previously filtered with a secondary filter; and
,comparing a signal from said rectifier to a reference with comparing means in order to ascertain the operability status of the mechanical device. - View Dependent Claims (11, 12)
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13. An apparatus for testing a mechanical device at a test location, the apparatus comprising:
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means for operating the mechanical device; means for sensing sounds and/or vibrations coming from the mechanical device with a sensor; means for filtering a signal from said sensor to highlight important frequencies; means for rectifying a signal from said means for filtering; means for ascertaining harmonics and sideband levels of repeating signals previously filtered and examining important frequencies with a secondary filter; and
,means for comparing a signal from said secondary filter to a reference in order to ascertain the operability status of the mechanical device. - View Dependent Claims (14, 15)
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16. An apparatus for testing a mechanical device at a test location, the apparatus comprising:
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means for sensing sounds and/or vibrations coming from the mechanical device with a sensor; an override loop for discarding random non-repeating sounds and/or vibrations; a secondary filter for ascertaining harmonics and sideband levels of repeating signals previously filtered; and
,means for comparing non-discarded output of said sensor to a reference in order to ascertain the operability status of the mechanical device. - View Dependent Claims (17, 18, 19, 20, 21)
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22. An apparatus for testing a mechanical device at a test location, the apparatus comprising:
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means for operating the mechanical device; means for sensing sounds and/or vibrations coming from the mechanical device with a sensor; means for discarding random non-repeating sounds and/or vibrations; a filter for filtering a signal from said sensor to highlight important frequencies; a secondary filter for examining said important frequencies from said filter and for ascertaining harmonics and sideband levels of repeating signals previously filtered; and
,means for comparing a signal from said secondary filter to a reference in order to ascertain the operability status of the mechanical device. - View Dependent Claims (23, 24)
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25. An improvement for a method for testing mechanical devices comprising the steps of:
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operating a device having a certain desired range of sounds and/or vibrations; sensing the sounds and/or frequencies coming from the device with a sensor to produce a signal; filtering said signal coming from said sensor to filter out said certain desired sounds and/or frequencies; and
,using a secondary filter to ascertain harmonics and sideband levels of repeating signals previously filtered.
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Specification