Analysis And Study Of Lubrication Property On High-speed And Heavyload Sliding Bearing

With the rapid development of high speed and overloading on engineering machinery, the rolling bearing that worked under low-speed transmission condition has been far from meeting the demands of working life in order to obtain higher transmission performance and power density. Thus, the sliding bearing was used as the planet wheel supporting to investigate the planetary transmission mechanism in this paper. The impact of roughness on axle neck and bush are always ignored on the study of sliding bearing. While it cannot be completely smooth in actual production of axle neck and bush because of the different of processing technology, roughness value and direction. In addition, the analysis results are different between ideal and actual especially under the high speed and heavy load condition. So, it is viatal of significance to study the effect of surface roughness on the lubricating property of sliding bearing with high speed and load.This paper has introduced the motion state of sliding bearing and the principle of oil film dynamic pressure lubrication. We established the mechanical model of the sliding bearing according to hydrodynamic lubrication theory and introduced some assumptions of the Reynolds equation. The Reynolds equation and the boundary conditions of the equation were also deduced and determined according to the actual project, respectively. The lubrication performance parameters of sliding bearing under ideal conditions were investigated with finite difference method by using the numerical analysis software of MatLab, which was proved reasonably compared with the classical theory. Besides, the effect of the value and direction of the roughness on the lubrication properties was studied and compared with the other properties under the ideal state. The results show that the oil film pressure is twice as big as that under the ideal state in the same conditions with high-speed and heavyload (n=12000rad/min, ε=0.8). Especially, the value of roughness of sliding bearing bush has obvious effect on the performance parameters.In order to research the lubricating properties of the sliding bearings, this passgae used the EMD algorithm broken the fault signal down into the intrinsic mode function components with a certain stability, and established the AR model based on the fault signal. Meanwhile, the SVM regression classification model was established which based on the autoregressive parameters and residual variance, and then determined the work status and fault types of the sliding bearing. The experimental data proved that the working state and the fault type of the sliding bearing is accord with the changes of various performance parameters of sliding bearings, which provides a powerful scientific experimental basis for the further study of the lubricating properties of the sliding bearing. The results in this passage make the research practical application value.