Detection of abnormal sound approach bearing

Acoustic detection of bearing anomalies present in two ways. One is the detection method based on acoustic noise, and the other is based on the vibration detection.
(A), noise detection method: the noise is less than 20db silencer based environment, the use of high-quality microphones to extract a certain distance and direction of the sound pressure bearing signal, and by a certain method to extract the abnormal sound component abnormal sound is a direct measurement method.

(B), vibration detection: abnormal sound is the indirect detection methods, detection can be divided into qualitative and quantitative parameters of detection. Among them, the qualitative detection method is divided into monitoring and observation of abnormal sound vibration waveform method. Detection of quantitative parameter refers to the measured bearing vibration signals measured with the abnormal sound-related parameter values, such as: vibration peak, crest factor to evaluate the bearing of abnormal sound.

(C), measuring bearing abnormal sound measuring instruments: measurement of sound measuring instruments bearing a lot of anomalies, such as: Hangzhou Bearing Test Research Center, BANT-1 bearing abnormal sound monitor; Shanghai Institute of Technology S092 bearing bearing vibration (abnormal sound) meter; Luoyang Bearing Research Institute and was jointly developed by Dalian Bearing Instrument S0910-Ⅲ. These bearings can be measured bearing vibration measuring instruments can also measure the RMS bearing abnormal acoustic parameters reflect the peak, crest factor and the number of such pulses.