接触传热表面粗糙度曲线的统计特征

THE STATISICAL CHARACTERISTIC OF ROUGHNESS PROFILES ON THERMAL CONTACT CONDUCTANCE SURFACE

测量了一般机械加工表面的轮廓曲线,基于小波变换提取了粗糙度曲线,分析了轮廓高度和接触峰高度的统计分布特征。研究结果表明,轮廓高度不服从严格的正态分布,但具有一定的正态性,而接触峰高度的统计特征与其评定标准有直接的关系。因此,对于接触热阻的计算模型来说,接触点数的计算应以合理选取接触峰的评定标准为前提。

The profiles of common machined surfaces are measured. Using wavelet transform, the roughness profiles are extracted. For the most roughness profiles, the distribution of profile height isn't in accord with Gaussian distribution strictly. The statistical distribution characteristic of contact peaks height is relative to the criterion of contact peaks. Before the evaluating of thermal contact resistance, it is important to choose the proper criteria of contact peaks for calculating the number of contacts .