基于均匀压力法的某制动盘瞬态温度场研究  

Transient thermal analysis of the wheel-mounted disc brake based on uniform pressure

作　　者：夏德茂[1] 奚鹰[1] 王永健[1] 左建勇[2] 

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]同济大学铁道与城市轨道交通研究院,上海200331

出　　处：《机械设计》2015年第8期7-11,共5页Journal of Machine Design

基　　金：国家自然科学基金资助项目(61004077)

摘　　要：制动盘在紧急制动过程中的瞬态温度场及其分布情况对制动器的寿命及制动性能有着重大的影响。提出了使用分段二次插值法来确定摩擦副周向接触弧长及热流分配系数与径向位置的关系;在此基础上,使用均匀压力法来确定作用在摩擦面上的热流密度;比较了2种不同热载荷确定方法得到的温度场分布。计算结果表明:周向接触弧长随径向位置呈先增大后减小的变化规律,且变化量较大,而热流分配系数与其相反;在制动第13.307 s时,盘面温度达到最大值227.03℃;制动盘径向和轴向方向上温度梯度较大;较取平均摩擦半径处的周向接触弧长和热流分配系数,温度峰值要高出19.82℃;所设计的制动盘符合工程初始设计要求。Distribution of the transient thermal of the brake disc during the emergency braking period plays a vital role in its service life and braking performance. The relationship between the circumferential contact arc length ,heat partition coefficient and radial distance was proposed by quadratic interpolation function method and then the heat flux which will be applied on the disc friction surface was determined by uniform pressure. The temperatures were calculated and compared by two different methods used to determine the thermal load. The results show that the circumferential contact arc length will increase firstly and then decrease with the increase of the radial distance and the amount of change is large, but the heat partition coefficient is opposite. It will reach the highest value 227.03 ℃ at time 13.307 s which is 19.82 ℃ higher than that who are determined at mean sliding radius. There is also a large temperature gradient both in axial and radial direction. The brake disc meets the initial engineering design requirements.

关 键 词：周向接触弧长 热流分配系数 瞬态温度场 制动盘 

分 类 号：U270.351[机械工程—车辆工程]