DIAGNOSTIC METHOD AND DIAGNOSTIC DEVICE FOR A SLIDE BEARING
First Claim
1. A diagnostic method for a slide bearing, comprising:
- detecting waveform data which represents an acceleration of a vibration which occurs when a slide bearing is in operation;
transforming acceleration waveform data into an acceleration spectrum of a frequency domain by applying a Fourier transform to the acceleration waveform data;
quantifying a plurality of peak information which occurs at a rotational frequency interval of a shaft to be measured in the acceleration spectrum by performing a predetermined signal process combined with rotational frequency information of the shaft;
obtaining a characteristic value;
monitoring whether the obtained characteristic value has exceeded a predetermined threshold value; and
when the characteristic value has exceeded the threshold value, determining that an abnormality has occurred in the slide bearing.
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Accused Products
Abstract
A sign of a minor rubbing abnormality of a slide bearing in a diesel engine is accurately detected. In order to realize the accurate detection, the following is performed: detecting waveform data which represents an acceleration of a vibration which occurs when a slide bearing is in operation; transforming acceleration waveform data into an acceleration spectrum of a frequency domain by applying a Fourier transform to the acceleration waveform data; quantifying a plurality of peak information which occurs at a rotational frequency interval of a shaft to be measured in the acceleration spectrum by performing a predetermined signal process combined with rotational frequency information of the shaft; obtaining a characteristic value; monitoring whether the obtained characteristic value has exceeded a predetermined threshold value; and when the characteristic value has exceeded the threshold value, determining that an abnormality has occurred in the slide bearing.
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Citations
13 Claims
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1. A diagnostic method for a slide bearing, comprising:
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detecting waveform data which represents an acceleration of a vibration which occurs when a slide bearing is in operation; transforming acceleration waveform data into an acceleration spectrum of a frequency domain by applying a Fourier transform to the acceleration waveform data; quantifying a plurality of peak information which occurs at a rotational frequency interval of a shaft to be measured in the acceleration spectrum by performing a predetermined signal process combined with rotational frequency information of the shaft; obtaining a characteristic value; monitoring whether the obtained characteristic value has exceeded a predetermined threshold value; and when the characteristic value has exceeded the threshold value, determining that an abnormality has occurred in the slide bearing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A diagnostic device for a slide bearing which diagnoses an abnormality such as a rubbing in the slide bearing, comprising:
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a revolution speed detection sensor which detects a revolution speed of a rotating shaft; an acceleration sensor which detects an acceleration during a vibration of the rotating shaft; a monitoring device which; transforms waveform data which represents an acceleration of a vibration detected by the acceleration sensor into waveform data of a frequency domain by applying a Fourier transform to the waveform data; quantifies a plurality of peak information which occurs at a rotational frequency interval in the waveform data of the frequency domain with an arithmetic unit which quantifies by performing a predetermined signal process combined with rotational frequency information; obtains a characteristic value; monitors whether the characteristic value has exceeded a predetermined threshold value; and when the characteristic value has exceeded the threshold value, determines that an abnormality has occurred in the slide bearing; and a reporting device which outputs a determination result to the outside when the monitoring device has determined that an abnormality has occurred in the slide bearing. - View Dependent Claims (10, 11, 12, 13)
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Specification