There are currently two ways to detect abnormal bearing noise. One is an acoustic-based noise detection method and the other is a vibration-based detection method.
(1) Noise detection method:
It uses a high-quality microphone to extract the bearing sound pressure signal at a certain distance and direction in a silenced environment with a basic noise of less than 20db, and extracts the abnormal sound components through a certain analysis method. It is a direct measurement method of abnormal sound.
(2) Vibration detection method:
It is an indirect detection method for abnormal sound, and can be divided into qualitative detection method and quantitative parameter detection method. Among them, the qualitative detection method is divided into the method of listening to abnormal sounds and the method of observing vibration waveforms. The quantitative parameter detection method refers to using the measured parameter values related to abnormal sound in the measured bearing vibration signal, such as: vibration peak value and crest factor to evaluate the abnormal sound of the bearing.
(3) Measuring instruments for measuring abnormal bearing noise:
There are many measuring instruments for measuring abnormal bearing noise, such as: BANT-1 bearing abnormal sound monitor of Hangzhou Bearing Test and Research Center; S092 bearing vibration (abnormal sound) measuring instrument of Shanghai Bearing Technology Research Institute; Luoyang Bearing Research Institute and Dalian Bearing S0910-Ⅲ jointly developed by the instrument factory. These bearing measuring instruments can measure the effective value of bearing vibration and can also measure the peak value, crest factor and pulse number that reflect abnormal bearing sound parameters.