轿车钢板表面形貌特征参数的提取

Establishment of Surface Profile Parameters of Sedan Steel Plates

通过对典型轿车钢板表面形貌的分析 ,以形貌与其摩擦学性能的关系为出发点 ,对粗糙表面、粗糙峰和粗糙谷的分布特性进行了统计分析 .结果表明 :粗糙表面、粗糙峰和粗糙谷数的统计分布特性与润滑及接触等性能密切相关 ;针对轿车钢板表面、粗糙峰和粗糙谷数在高度方向概率分布曲线的非 Gauss特性 ,提出采用 Weibull概率密度函数的非线性曲线拟合对分布特征进行分析处理 .所得拟合参数具有非常明确的物理意义 。

The distribution of surface height, surface asperity and valley number of various sedan steel plates were analyzed by correlating the surface profile features with the tribological behavior. The results show that the distribution is correlative with the lubrication performance and contact behavior of the surfaces. A kind of nonlinear curve fit method based on Weibull probability density function was adopted for the analysis of the distribution because of the non-Gauss distribution feature. Some important parameters with explicit physical meaning were established by the curve fit method. Thus it is feasible to express the characteristic distribution of the surface profiles of various sedan steel plates by using a few parameters as alternatives of probability density function.