Bearing defect detection using time synchronous averaging (TSA) of an enveloped accelerometer signal
First Claim
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1. A method of identifying a rotating bearing defect comprising the steps of:
- measuring the vibration of the rotating bearing to obtain a waveform signal;
filtering the waveform signal to remove unwanted signal frequencies;
enveloping the filtered waveform signal to obtain an enveloped low frequency time waveform; and
synchronizing the enveloped low frequency time waveform to the running speed of the rotating bearing in such a way to preserve the phase relationship between the tachometer pulse and bearing defect to obtain a time synchronized waveform.
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Abstract
A method of identifying a rotating bearing defect comprising the includes of: measuring the vibration of the rotating bearing to obtain a waveform signal; filtering the waveform signal to remove unwanted signal frequencies; enveloping the filtered waveform signal to obtain an enveloped low frequency time waveform; and synchronizing the enveloped low frequency time waveform to the running speed of the rotating bearing to obtain a time synchronized waveform.
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Citations
20 Claims
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1. A method of identifying a rotating bearing defect comprising the steps of:
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measuring the vibration of the rotating bearing to obtain a waveform signal;
filtering the waveform signal to remove unwanted signal frequencies;
enveloping the filtered waveform signal to obtain an enveloped low frequency time waveform; and
synchronizing the enveloped low frequency time waveform to the running speed of the rotating bearing in such a way to preserve the phase relationship between the tachometer pulse and bearing defect to obtain a time synchronized waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of identifying a rotating bearing defect comprising the steps of:
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measuring an accelerometer signal generated at least in part by the rotating bearing to obtain a waveform signal;
filtering the waveform signal using a bandpass filter to remove unwanted signal frequencies;
enveloping the filtered waveform signal to obtain an enveloped low frequency time waveform;
measuring the rotational speed of the rotating bearing;
synchronizing the enveloped low frequency time waveform to the rotational speed of the rotating bearing in such a way to preserve the phase relationship between the tachometer pulse and bearing defect to obtain a time synchronized waveform;
averaging the time-synchronized waveform with at least one previously stored time synchronized waveform to obtain an average time synchronized waveform (TSA);
spectrum analyzing the TSA; and
identifying an amplitude of the TSA at rotating bearing defect frequencies and their multiples.
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15. A method for identifying defects in a rolling bearing, comprising the steps of:
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measuring an accelerometer signal generated by said rolling bearing, time synchronous averaging said accelerometer signal to remove vibration frequencies which are not in synchronism to the rotational speed of said bearing;
analyzing said averaged signal to obtain bearing defect frequencies indicative of the extent of the bearing defect. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification