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US 2026/0036490 A1Published application
Vibration detection device, abnormality detection assistance system, and vibration detection method
AssigneeNSXe Co. LTD
InventorsShoji SUZUKI, Shinji NAKAYAMA
Life of this patent
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Abstract
A vibration detection device includes a vibration detector that detects vibration generated in a rolling bearing and converts the vibration into an analog signal and a sampler that performs sampling on the analog signal to convert the analog signal into a digital signal. In the vibration, a repeating unit including a first vibration section in which vibration occurs at a predetermined first frequency and a second section following the first vibration section is repeated at a predetermined repetition period, when a flaw is generated in the rolling bearing, and the sampler performs sampling on the analog signal at a sampling frequency lower than twice the first frequency.
Claims9
1:
- An abnormality detection assistance system comprising:
- a vibration detector that detects vibration generated in a rolling bearing and converts the vibration into an analog signal;
- a sampler that performs sampling on the analog signal to convert the analog signal into a digital signal;
- an envelope-detector that detects an envelope of a vibration waveform based on the digital signal;
- and
- a frequency analyzer that performs frequency analysis on the envelope to calculate an analysis value for each frequency component, wherein
- in the vibration, a repeating unit including a first vibration section in which vibration occurs at a predetermined first frequency and a second section following the first vibration section is repeated at a predetermined repetition period, when a flaw is generated in the rolling bearing, and
- the sampler performs the sampling, without taking a measure for preventing folding, on the analog signal at a sampling frequency lower than twice the first frequency to convert the analog signal into the digital signal containing folding noise.
5 more elements
2:
- The abnormality detection assistance system according to claim 1, wherein a period of the sampling is shorter than ½ of the repetition period.
(canceled)
4:
- The abnormality detection assistance system according to claim 1, further comprising:
- an abnormality determiner that determines an abnormality when a magnitude of the analysis value for each frequency component exceeds a preset reference value in a reference frequency range that is a frequency range including a repetition frequency obtained by inverting the repetition period.
5:
- The abnormality detection assistance system according to claim 4, wherein
- the reference frequency range includes an outer ring frequency range set in association with an outer ring of the rolling bearing, and
- the abnormality determiner determines that the outer ring is in an abnormal state when a magnitude of the analysis value for each frequency component exceeds the reference value within the outer ring frequency range.
6:
- The abnormality detection assistance system according to claim 4, wherein
- the reference frequency range includes an inner ring frequency range set in association with an inner ring of the rolling bearing, and
- the abnormality determiner determines that the inner ring is in an abnormal state when a magnitude of the analysis value for each frequency component exceeds the reference value within the inner ring frequency range.
7:
- A vibration detection device to be used in the abnormality detection assistance system according to claim 1, the vibration detection device comprising:
- the vibration detector;
- and
- the sampler.
1 more element
8:
- A vibration detection device comprising:
- a vibration detector that detects vibration generated in a rolling bearing and converts the vibration into an analog signal;
- and
- a sampler that performs sampling on the analog signal to convert the analog signal into a digital signal, wherein
- in the vibration, a repeating unit including a first vibration section in which vibration occurs at a predetermined first frequency and a second section following the first vibration section is repeated at a predetermined repetition period, when a flaw is generated in the rolling bearing, and
- the sampler performs the sampling, without taking a measure for preventing folding, on the analog signal at a sampling frequency lower than twice the first frequency to convert the analog signal into the digital signal containing folding noise.
3 more elements
9:
- A vibration detection method comprising:
- detecting vibration generated in a rolling bearing and converting the vibration into an analog signal;
- and
- sampling the analog signal to convert the analog signal into a digital signal, wherein
- in the vibration, a repeating unit including a first vibration section in which vibration occurs at a predetermined first frequency and a second section following the first vibration section is repeated at a predetermined repetition period, when a flaw is generated in the rolling bearing, and
- in the sampling, the analog signal is sampled, without taking a measure for preventing folding, at a sampling frequency lower than twice the first frequency to convert the analog signal into the digital signal containing folding noise.
3 more elements
Dependencies are inferred from the claim text.