磨合表面形貌特征参数的提取及分析

Feature Parameter Extraction and Analysis for Running-in Surface Topography

在销-盘式摩擦磨损试验机上对船用柴油机活塞环-缸套材摩擦副进行磨合磨损试验,采用光学显微镜对不同磨损阶段的磨损表面形貌进行观察分析,应用小波分析和奇异值分解提取磨损表面统计特征的低频特征参数和高频特征参数.结果表明:低频特征参数和高频特征参数刻画了磨合表面的形貌特征,可以作为磨合表面的特征参数;低频特征参数反映了磨合表面的接触面积,其值愈大,接触面积愈大;高频特征参数反映了磨合表面的粗糙度,其值愈大,粗糙度愈小.

Running-in wear test for materials of piston ring against cylinder liner was conducted on a pin-on-disc tester. The surface topography was observed and analyzed by an optical microscope. Low frequency feature parameter and high frequency feature parameter of worn surface based on statistical feature were extracted by using wavelet analysis and singular value decomposition. It was shown that low frequency feature parameter and high frequency feature parameter revealed the topography feature of running-in surface. Low frequency feature parameters reflected contact area of the running-in surface, the larger low frequency feature parameters, the larger contact area. High frequency feature parameters reflected roughness of the running-in surface, the larger high frequency feature parameters the smaller roughness. Therefore low frequency feature parameter and high frequency feature parameter can be used as the feature parameter for the running-in surface evaluation.