Current status and progress of needle roller bearing performance research?

For a long time, many scholars at home and abroad have been paying attention to and committed to the research of bearing performance, and have achieved many results. Discuss the stability of the bearing system, and find that the bearing index method is used to study the variability of the speed fluctuation on the dynamic performance of the bearing; Louilsil!) Non-linear analysis is carried out with the concepts of frequency spectrum analysis, frequency response and phase trajectory. Changes will lead to major changes in the phase space, high-order Poincare mapping, and Lyapunov analytic pairings: Jie Yunlong proposed a phase trajectory diagram method and Lyapunov exponent method for detecting early failures of bearings with Dfing hybrid vibrator; Jiang Wei 4 used The pseudo-dynamic theory analyzes the change state of the angular contact ball bearing's contact force, contact angle, and spin-to-roll ratio. It is believed that the performance parameters of the bearing show significant nonlinear changes, and the dynamic characteristics of steel ball bearings and ceramic bearings are found The parameters have different stability, and the fluctuation characteristics of bearing friction torque under different axial load and temperature conditions are discussed; Douglas19] proposed a layered mechanism of rolling and sliding wear of polyethylene material bearings to describe the biological activity of wear debris; Lin Guanyu[20] clarified the lubrication mechanism of chlorophenyl silicone oil-lubricated ball bearings, and studied the bearing friction torque behavior under different vacuum degrees and speeds; Saad2"1 used acoustic emission technology to explore the geometric size identification method of rolling bearing surface defects; Huang Dunxin [2] found that the ceramic ball was mainly damaged by surface cracks and surface layer peeling through dry friction and high-speed running experiments. The raceway damage showed various forms such as fatigue cracks, pitting and plough marks; Abbasion [231 used wavelet and support The vector machine theory recommends a multi-fault diagnosis method for the bearing system. Considering the influence of the load distribution, the composition of the fault shock pulse sequence, the position change of the damaged part, and the environmental noise on the vibration characteristics under the operating conditions of the bearing, the local damage status of the inner ring is established. Harmonic analysis of bearing vibration signals, using statistical concepts such as spectral probability density and standard deviation probability density; Uedal261 proposed the concept of enhanced life and carried out factor analysis to improve bearing life under polluted lubrication conditions, respectively Multi-scale analysis of bearing defects, wavelet support vector machine classification and chaos identification are carried out; Jia Minping 1291 analyzes the cyclostationarity of bearing fault signals, and uses acoustics and modern signal analysis theories to study non-contact multi-sensor acoustic diagnosis methods to evaluate bearings The early failure of the device; Wang Jiugen, using group theory to divide the parameters affecting bearing noise into geometry, materials, mechanics, kinematics, dynamics, tribology, and acoustic properties, and other parameter groups, introduced-a kind of relative moving silicon surface Miniature ball bearings are used to reduce the wear of micro-machines and nano-machines, and the influence factors of bearing life are discussed.

These studies have found that bearing performance has nonlinearity, variability, chaos, diversity, and the complexity of influencing factors. How to evaluate the performance of rolling bearings has become an urgent problem in the bearing industry and related industries.

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