At present, there are two ways to detect abnormal sound of bearings. One is based on acoustic noise detection, the other is based on vibration detection.

It is a direct measurement method of abnormal sound, in which high quality microphone is used to extract the bearing sound pressure signal at a certain distance and direction under the muffling environment with the basic noise less than 20dB, and the abnormal sound components are extracted by a certain analysis 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, qualitative detection method is divided into monitoring abnormal sound method and observing vibration waveform method. Quantitative parameter detection method refers to the evaluation of abnormal sound of bearing by using measured parameter values related to abnormal sound in the vibration signal of bearing under test, such as vibration peak and wave peak factor.

There are many measuring instruments for measuring abnormal sound of bearings, for example: Ban-1 type bearing abnormal sound monitor in Hangzhou Bearing Test and Research Center; S092 Bearing vibration (abnormal sound) measuring instrument of Shanghai Bearing Technology Institute; S0910- ⅲ was jointly developed by Luoyang Bearing Research Institute and Dalian Bearing Instrument Factory. These bearing measuring instruments can measure the effective value of bearing vibration as well as the peak value, peak factor and pulse number reflecting the abnormal sound parameters of the bearing.

1. Keep the original package and do not open it at will. If the package is damaged, it must be opened, cleaned and reoiled.

2. The relative humidity of the storage room should not exceed 60%, and the temperature difference should not be too large. The bearings placed in the original packaging can be stored for several years. For sealed bearings or bearings with dustproof covers, the lubrication characteristics of the grease filled in the bearings may be reduced after long-term storage.

3, storage should also be shockproof and shaking. Bearings that are not stored in the original packaging should be properly preserved. It is strictly prohibited to put bearings together with corrosive things to prevent corrosion and pollution.

4. Large rolling bearings can only be placed flat when stored, and the sides of the inner and outer rings are best supported. If stored in an upright position, permanent deformation may occur due to the relatively thin inner and outer ring walls due to the heavier inner and outer ring and rolling parts.

If you have any questions of bearing,pls feel free to contact us.

E-mail：bearing6@hyzcgroup.com