【作者】 李国宾； 关德林； 李廷举；

【Author】 Li Guobin;Guan Delin;Li Tingju;

【机构】 大连理工大学材料科学与工程博士后流动站； 大连海事大学轮机工程学院；

【摘要】 采用环-盘摩擦磨损试验机研究了表面纳米化前后中碳钢的摩擦振动行为。提出利用小波包变换和奇异值分解提取摩擦振动信号特征的新方法。给出了小波包变换算法及奇异值分解算法,依据矩阵奇异值特征向量,定义了振动信号特征参量,并探讨了特征参量与表面纳米化前后中碳钢摩擦磨损性能的内在联系。结果表明:摩擦振动信号的特征参量可反映表面纳米化中碳钢的摩擦磨损性能。当试验载荷在50~150N时,表面纳米化处理的中碳钢振动信号特征参量小于未处理的,摩擦磨损性能好;当试验载荷在200~300N时,表面纳米化处理的中碳钢振动信号特征参量接近或大于未处理的,摩擦磨损性能变差;因此,表面纳米化中碳钢的摩擦磨损性能可通过摩擦振动信号特征参量来评定。更多还原

【Abstract】 The friction vibration behaviors for surface nanocrystallization of medium carbon steel are studied by a ring-on-disc tester under lubrication.A novel approach for extracting feature of vibration signals is proposed using waveletpacket transform and singularity value decomposition.The waveletpacket transform and the singularity value decomposition arithmetic are introduced.The characteristic parameters are defined based on the singular value characteristic vector.The intrinsic relationship between the characteristic parameters and the friction wear properties of surface nanocrystallization of medium carbon steel are discussed.It has been shown that the characteristic parameters of friction vibration signals can sensitively reflect the friction wear properties of surface nanocrystallization of medium carbon steel.When the test loading is 50 ~ 150 N,the characteristic parameters appear smaller,the friction wear properties turn to the better.When the test loading is 200 ~ 300 N,the characteristic parameters appear larger,the friction wear properties turn to the worse.Therefore the evaluation of friction wear properties of surface nanocrystallization of medium carbon steel can be carried out by the characteristic parameters of friction vibration signals.更多还原