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Detection method of abnormal sound
(1) Noise detection method
In a silencing environment where the basic noise is less than 20db, a high-quality microphone is used to extract the bearing sound pressure signal at a certain distance and direction, and the abnormal sound components are extracted through a certain analysis method. It is a direct measurement method for abnormal sound.
(2) Vibration detection method
It is an indirect detection method of abnormal sound, which can be divided into qualitative detection method and quantitative parameter detection method. Among them, the qualitative detection method is divided into monitoring abnormal sound method and observing vibration waveform method. The quantitative parameter detection method is to use the measured parameter values related to the abnormal sound in the tested bearing vibration signal, such as the peak value of the vibration and the crest factor to evaluate the abnormal sound of the bearing.
(3) Measuring instruments for measuring abnormal sound of bearings:
There are many measuring instruments for measuring abnormal bearing sound. These bearing measuring instruments can measure the effective value of bearing vibration and also measure the peak value, crest factor and pulse number reflecting the abnormal bearing sound parameters.
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