Running-in is an important stage in friction and wear, the research on its process and evolution law is significant for running-in state identification and prediction. Running-in process tests were conducted on a tribometer under different conditions and its signals were collected. The phase space reconstruction and principal component analysis methods are introduced to reconstruct phase trajectory. Considering the limitations existing in traditional parameters, the vector characterization parameters of the minimum cosine similarity and the maximum distance between the adjacent phase points are proposed and their validity is studied. They can identify the state changes and characteristics of the running-in attractor and describe the evolution law of the running-in process. Thus, the vector characterization parameters have important application value and theoretical significance.

磨合是摩擦磨损的重要阶段，对其磨合过程和演变规律的研究对磨合状态的识别和预测具有重要意义。在不同条件下的摩擦计上进行磨合过程测试，并收集其信号。引入相空间重构和主成分分析方法来重构相轨迹。考虑到传统参数的局限性，提出了最小余弦相似度和相邻相点之间最大距离的矢量表征参数，并研究了其有效性。他们可以识别磨合吸引子的状态变化和特征，并描述磨合过程的演化规律。从而，