Rolling bearings NSK bearings are one of the most widely used in the mechanical sector. Its small coefficient of friction, precision high, is not sensitive to viscosity of the lubricant, can withstand the load even in low-speed characteristics, such as the majority of users love, but also because they made is also one of the most delicate parts of rolling bearings. Today we give you the NSK bearings under new technology of rolling bearing fault monitoring, lets first look at history of fault monitoring technology:
　　1, the most original approach is to listen to the sound bar (or screwdriver) contact with seats, rely on hearing to determine there is trouble-free. Although aware of trained immediately fatigue spalling and damage parts of the bearing, but influenced by subjective factors.
　　2, after various vibrometer, free vibration, displacement, velocity, or acceleration of RMS or peak to determine the bearing trouble-free, this reduces the dependence on human experience. But it is still difficult to find fault.
　　3, 60 Sweden company invented the shock pulse meters (Shock Pulse Meter) to detect bearing damage, is fast, simple and accurate, representative instrument is MEPA-10A;SPM-43A.
　　4, 70 Japan Nippon Steel Corporation developed a detector MCV-021A machine (Machine Checker), respectively in the detection of low-frequency, medium frequency and high frequency bearing an exception signal. Another oil film inspecting apparatus, can detect oil film lubrication for situation monitoring.
　　5, 80 Japan Seiko Corporation (NSK bearing) bearing monitor have developed NB-1, NB-2, NB-3, NB-4. 1KHZ~15KHZ bearing vibration signal in the range, measure the peak and RMS value to detect bearing failures. Due to remove low frequency interference, increased sensitivity, which also has alarm settings.
　　With in-depth study of kinematics, dynamics of rolling bearings, bearing vibration signal in frequency and size of bearing parts and defects in a clearer understanding of the type of relationship. In addition, development of fast Fourier transform technique, pioneered frequency domain analysis method for detection and diagnosis of bearing failure. These studies laid the theoretical foundation, is now available for a variety of signal processing technique for rolling bearing fault diagnosis and monitoring. Frequency refining technology, cepstrum, complex spectrum and so on, in the pretreatment of signal using a variety of filtering technologies, such as the medium lossfor coherent wave, adaptive filtering, improved diagnostic sensitivity.
　　In addition to using vibration signal monitoring bearings, also developed other technologies. For example, oil pollution analysis method (spectroscopy, magnetic chip detector and ferrographic analysis), acoustically on law, sound method of diagnostics and resistance, vibration monitoring method used most widely is, one of the shock pulse method is the most popular method of detection and diagnosis.
　　On factors that greatly influenced the life of NSK bearings are installed, work status and maintenance, in order to prevent the consequences of a sudden damage of bearing most ideally keep track of bearing work status, in the past, for this purpose tested temperature measurement, vibration and acoustic measuring method, now invented a new way--shock pulse method. Principle is to grasp the bearing damage caused by mechanical impact.
　　Unlike other mechanical parts of rolling bearings, shock pulse signal generated is different from General machinery vibration signal, it's vibration signal frequency range is very wide, very low signal-to-noise ratio, signal attenuation on the delivery path, extracting characteristic information it must also adopt some special type of detection technology and treatment methods. Shock pulse method is one of the many methods.
　　This method in determination of bearings in the bearing during normal working without the machinery of the State of the original design, effect size, vibration or noise, instruments made with this method to exclude during the testing machine and the vibration of the bearing itself directly to judge the State of bearings and life. And early detection and identification by poor poor poor manufacturing, Assembly, lubrication of rolling bearings and use rotating bearing surface scars in life about the reason for the exception, the degree of deterioration and trends.
　　Purpose of using shock pulse tester, mainly using bearing all of life, avoiding unnecessary replacement, through continuous measurement to obtain an approximation of bearing failure early warning to reduce equipment failure rates, and no plan of unnecessary maintenance work.



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