摩擦面波状磨耗的分形描述方法  

Fractal description method of corrugation for friction surface

作　　者：陈光雄[1] 胡文萍[1] 王平[2] 朱旻昊[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室,四川成都610031 [2]荆楚理工学院机械工程学院,湖北荆门448000

出　　处：《交通运输工程学报》2015年第1期25-33,共9页Journal of Traffic and Transportation Engineering

基　　金：国家自然科学基金项目(51275429);四川省科技计划项目(2010GZ0227);教育部长江学者和创新团队发展计划项目(IRT1178);中央高校基本科研业务费专项资金项目(SWJTU12ZT01)

摘　　要：在自行搭建的销-盘试验机上进行自激励振动条件下的滑动摩擦试验,通过销-盘的摩擦运动来模拟轮轨间的平均接触应力。利用激光位移传感器测量盘试件摩擦面的波状磨耗尺寸,得到了不同试验条件下盘试件摩擦面的波状磨耗曲线。运用功率谱法对摩擦面的波状磨耗进行分形描述,根据功率谱指数与分形维数的关系计算不同试验条件下波状磨耗的分形维数,分析了分形维数与转速、法向载荷、转数等参数的关系。试验结果表明：在相同法向载荷下,利用功率谱法求得的分形维数随转速的增加而增大;在相同转速下,分形维数随法向载荷的增加而增大;在相同转速和法向载荷下,分形维数随转数的增加而减小;盘试件摩擦面波状磨耗的分形维数为1.79-1.92,分形特征显著,分形维数越大,盘试件摩擦面波状磨耗越严重,波状磨耗波长越长。利用功率谱法求得的结果与试验结果一致,可用分形维数定量描述摩擦面的波状磨耗。On the self-built pin-on-disc test machine, the sliding friction test under self-excited vibration was carried out. The average contact stress between wheel and track was simulated by using the friction movement of pin-on-disc. The corrugation sizes of friction surface for disc specimen were measured with laser displacement sensor, the corrugation curves of friction surface for disc specimen under different test conditions were obtained. The fractal description method of corrugation for friction surface was carried out with power spectrum method, the fractal dimensions of corrugation under different test conditions were calculated based on the relationship between power spectrum index and fractal dimension, and the relationships between fractional dimension and other parameters such as rotating speed, normal load and revolution were analyzed. Test result shows that under the same normal load, the fractal dimension calculated by using power spectrum method increases with the increase of rotating speed. Under the same rotating speed, the fractal dimension increases with the increase of normal load. Under the same rotating speed and normal load, the fractal dimension decreases with the increase of revolution. The fractional dimension of corrugation of friction surface for disc specimen is from 1.79 to 1.92,the corrugation of friction surface for disc specimen have obvious fractal characteristics. The larger the fractal dimension is, the more serious the corrugation of friction surface for disc specimen is, and the longer the wave length of corrugation is. The result calculated by using power spectrum method is consistent with the experimental result, so fractal dimension can be used to quantitatively describe the corrugation of friction surface. 1 tab, 26 figs, 29 refs.

关 键 词：铁道工程 波状磨耗 功率谱 分形维数 摩擦振动 波长 波深 

分 类 号：U213.42[交通运输工程—道路与铁道工程]