摘要
将W-M分形函数引入风电制动器制动过程的摩擦生热研究中,根据W-M分形表面形貌的特点及利用其特有的自相似性,以Matlab软件模拟出粗糙表面的分形曲面形貌.通过Creo软件建立不同分形维数的粗糙表面模型,运用Abaqus有限元软件分析分形维数、相对滑动速度、施加载荷对粗糙表面制动过程中闪点温度和接触压力的影响.结果表明:随着分形维数增大,摩擦区域块状热区的数量减少,而点状热区的数量增多;相对速度越大时,接触区域最顶端的微凸体节点温度也越大,非接触区域温度上升速率也越快;施加载荷增大时,微凸体的最高闪温点的温度变化幅度不大,但会影响热区的数量大小与次闪温点和非接触点的温度.
The Weierstrass-Mandelbrot（W-M）fractal function is introduced into the research of friction heat generation in braking process of wind power brake.According to the characteristics of surface morphology of W-M fractal theory and its unique self-similarity,the fractal surface morphology of rough surface is simulated by using Matlab.The rough surface model with different fractal dimensions is established by Creo software.And the flash point temperature and contact stress in rough surface brake process are analyzed under different fractal dimensions,relative sliding velocities and applied loads through finite element software Abaqus.The results show that the number of block hot zone increases and the number of dotted hot zone decreases in friction areas as the fractal dimension increases.The higher the relative velocity is,the greater the temperature of the asperity nodes is at the top of the contact area,and the faster the rate of temperature rises in the non-contact region.When the applied load increases,the temperature of the highest flash point of the asperity increases little,but it can affect the number of hot zones and the temperature of the sub-flash point and non-contact point.
作者
刘宇
邓宏盛
张生芳
沙智华
马付建
尹剑
LIU Yu;DENG Hongsheng;ZHANG Shengfang;SHA Zhihua;MA Fujian;YIN Jian(School of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,Liaoning,China)
出处
《中国工程机械学报》
北大核心
2018年第3期194-201,共8页
Chinese Journal of Construction Machinery
基金
国家自然科学基金资助项目(51675075
51475066)
辽宁省自然科学基金资助项目(2015020114)
关键词
粗糙表面
W-M函数
分形维数
摩擦生热
rough surface
W-M fractal function
fractal dimension
friction heat
