考虑粗糙度效应的点接触混合润滑数值研究OA

Contact components(such as gears,bearings,cams,etc.)exhibit incompletely smooth surfaces after manufacturing and machining.At the microscopic point of view,these surfaces are covered with roughness peaks of varying sizes.Surface topography parameters directly influence the distribution of the lubricating oil film,which in turn affect the lubrication performance of the contact components.In order to explore the influence of rough surface on contact characteristics under mixed lubrication,the research group carried out numerical simulation and analysis of random rough surface point contact mixed lubrication considering roughness effect.The digital filtering technique and Fast Fourier Transform(FFT)algorithm were used to simulate random rough surfaces,and a steady-state mixed lubrication model considering roughness effect was established by the unified Reynolds equation system.The effects of different roughness characteristic parameters(skewness,kurtosis,root mean square of roughness and autocorrelation aspect ratio)on the mixed lubrication performance were focused on.The results show that the dimensionless average film thickness decreases with the increase of skewness and kurtosis;the greater the root mean square roughness,the more intense the fluctuations in pressure and film thickness;the larger the autocorrelation aspect ratio,the more pronounced the horizontal texture features,which is more conducive to lubricant storage.