Method and device for assessing residual service life of rolling bearing
First Claim
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1. A method for assessing the remaining service life of a rolling bearing, characterized in comprising:
- baseline data acquisition means for obtaining vibration signals by using an accelerometer (4) and using a testing device to acquire signals in a frequency band that includes resonance frequency band signals detectable at the highest sensitivity, for each specification such as model number, manufacturer name, and other specifications for a rolling bearing (3) as pertains to the relationship between the state of wear particle penetration in the rolling bearing (3) and the vibration/bearing service life, and to lubricant degradation and vibration/bearing service life;
measurement means whereby an accelerometer (4) is used to obtain vibration signals for the rolling bearing (3) whose remaining service life is being assessed and which resides on a fan, a pump, or another rotating device (1, 2), for the purpose of measuring signals in a frequency band that includes resonance frequency band signals detectable at the highest sensitivity; and
determination means for estimating the state of wear particle penetration and the state of lubricant degradation of said diagnostic rolling bearing (3), and computing the remaining service life of said diagnostic rolling bearing (3) by using measurement values obtained by said measurement means, determination results relating to said bearing specifications, and data obtained by said baseline data acquisition means;
whereinsaid determination means makes a determination regarding the model number, manufacturer name, and other bearing specifications for said diagnostic rolling bearing (3) after dividing the vibration waveform at 1 kHz to 6 kHz into ½
-octave frequency bands to obtain a plurality of bands for said diagnostic rolling bearing (3), performing envelope processing for the waveforms of each frequency band, and computing a frequency spectrum.
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Abstract
Degradation of the lubricant due to contamination of the lubricant with wear particles or moisture, which greatly affects the service life of rolling bearings, can be detected in a cost-effective manner through the use of a resonance frequency band signal or high-frequency signal of an accelerometer, and the service life of a rolling bearing can be estimated with high precision at an early stage on the basis of the detected state of the wear particles and lubricant.
25 Citations
32 Claims
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1. A method for assessing the remaining service life of a rolling bearing, characterized in comprising:
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baseline data acquisition means for obtaining vibration signals by using an accelerometer (4) and using a testing device to acquire signals in a frequency band that includes resonance frequency band signals detectable at the highest sensitivity, for each specification such as model number, manufacturer name, and other specifications for a rolling bearing (3) as pertains to the relationship between the state of wear particle penetration in the rolling bearing (3) and the vibration/bearing service life, and to lubricant degradation and vibration/bearing service life; measurement means whereby an accelerometer (4) is used to obtain vibration signals for the rolling bearing (3) whose remaining service life is being assessed and which resides on a fan, a pump, or another rotating device (1, 2), for the purpose of measuring signals in a frequency band that includes resonance frequency band signals detectable at the highest sensitivity; and determination means for estimating the state of wear particle penetration and the state of lubricant degradation of said diagnostic rolling bearing (3), and computing the remaining service life of said diagnostic rolling bearing (3) by using measurement values obtained by said measurement means, determination results relating to said bearing specifications, and data obtained by said baseline data acquisition means;
whereinsaid determination means makes a determination regarding the model number, manufacturer name, and other bearing specifications for said diagnostic rolling bearing (3) after dividing the vibration waveform at 1 kHz to 6 kHz into ½
-octave frequency bands to obtain a plurality of bands for said diagnostic rolling bearing (3), performing envelope processing for the waveforms of each frequency band, and computing a frequency spectrum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11, 12, 14, 15, 16, 17, 19, 20, 21, 23, 26, 27, 28, 29, 31, 32)
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8. A method for assessing the remaining service life of a rolling bearing, characterized in comprising:
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baseline data acquisition means for obtaining vibration signals by using an accelerometer (4) and using a testing device to acquire signals in a frequency band that includes resonance frequency band signals detectable at the highest sensitivity, as pertains to the relationship between the state of wear particle penetration in a rolling bearing (3) and the vibration/bearing service life, and to lubricant degradation and vibration/bearing service life; measurement means whereby an accelerometer (4) is used to obtain vibration signals for the rolling bearing (3) whose remaining service life is being assessed and which resides on a fan, a pump, or another rotating device (1, 2), for the purpose of measuring signals in a frequency band that includes resonance frequency band signals detectable at the highest sensitivity; and determination means for estimating the state of wear particle penetration and the state of lubricant degradation of said diagnostic rolling bearing (3), and computing the remaining service life of said diagnostic rolling bearing (3) by using measurement values obtained by said measurement means, and data obtained by said baseline data acquisition means;
whereinsaid determination means calculates the relative sensitivity of an effective value in two frequency bands, which are a wide band and a narrow band that includes the sensor resonance frequency band, from vibration signals having a frequency band of 1 kHz to 64 kHz for said diagnostic rolling bearing (3);
determines whether a quantitative feature that is the product of the relative sensitivity of a narrow-band effective value and the relative sensitivity of the wide-band effective value exceeds a threshold value; and
makes a determination of “
normal”
when the threshold value is not exceeded. - View Dependent Claims (9, 10, 13, 18, 22, 24, 25, 30)
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Specification