ntn bearing different acoustic detection and sales deception

1: ntn bearing different Sound Detection:
1., Vibration detection method: It is unusual sound of an indirect detection methods, detection can be divided into qualitative and quantitative parameters of detection. Among them, qualitative detection method is divided into monitoring and observation of abnormal sound vibration wave method. Quantitative parameter detection method refers to the measured bearing vibration signals measured and abnormal sound-related parameter values such as: vibration peak, crest factor to evaluate the abnormal sound of Bearings.
2., Measuring bearing abnormal sound measuring instruments: measurement of bearing a lot of unusual sound measuring instruments, such as: Hangzhou Bearing Test Research Center BANT-1 Bearing Abnormal Sound monitor; Shanghai Institute of Technology S092 bearing bearing vibration (abnormal sound ) measuring instrument; Luoyang Bearing Research Institute and was jointly developed by Dalian Bearing Instrument Factory S0910-Ⅲ. These bearings can be measured bearing vibration measuring instruments can also measure the RMS bearing abnormal acoustic parameters reflect the peak, peak factor and pulses and so on.
3., Noise detection method: It is in the underlying noise is less than 20db silencer environment, the use of high-quality microphone in order to extract a certain distance and direction of the bearing sound pressure signal, and after a certain degree of analytical methods to extract the abnormal sound components, Abnormal sound direct measurement method.
2: ntn bearing sales of the deception:
1, the ordinary level bearing typing into a D-class bearings;
2, the famous giant fake users, dealers, agents, and even spot counterfeit manufacturers retail outlet;
3, using defective bearings posing as genuine bearings;
4, the low-quality bearings, small factories bearing marked with maker's trademark, the famous maker of counterfeit products, internal and external packaging and certification;
5, good things would turn out fake goods Lane;
6, counterfeit products, fonts vague, floating on the surface, some of them can be erased by hand.
7, followed by the surface to see whether there are muddy traces of oil, rust-proof technology, if not at home, it is easy to leave a thick layer of oil, very viscous in his hand.
8, fakes sell genuine price genuine selling D-level price, the price of the use of counterfeit;

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