Abstract: In order to accurately predict the temperature field distribution of braking system under actual working conditions, the pressure-dependent frictional coefficient, temperature-dependent thermophysical properties of materials, contact pressure increasing exponentially with time, and braking speed are considered comprehensively. The thermal characteristic of disc brake during single braking is studied by using finite element method, and the braking time, braking distance, and transient temperature field distribution under different contact pressure are obtained. The results show that the temperature of the brake disc rises and then decreases during the process of braking. The smaller the contact pressure, the longer the braking time and braking distance, and the smaller the temperature rise. The temperature of the brake disc fluctuates in a zigzag pattern, and the amplitude of the fluctuation increases first and then decreases. The research results provide a theoretical basis for the accurate prediction of braking performance and have certain practical value in engineering.

Key words: Transient temperature field; Disc brake; Thermal sensitive material; Contact pressure; Frictiona coefficient

摘要： 为了准确预测制动系统在实际工况下的温度场分布，综合考虑与压力有关的摩擦系数、 与温度有关的材料热物理特性、随时间呈指数增长的接触压力及制动速度之间的相互耦合作 用，采用有限元法对单次制动过程中盘式制动器的热特性进行了研究，得到了不同接触压力 下制动时间、制动距离及瞬态温度场的变化规律。结果表明，制动过程中制动盘温度先上升 后下降，接触压力越小，制动时间和制动距离越长，温升越小；制动盘的温度呈现锯齿形的 波动，波动的幅值先增大后减小。研究结果为制动性能的准确预测提供了理论基础，具有一 定的工程应用价值。

关键词: 瞬态温度场；盘式制动器；热敏感性材料；接触压力；摩擦系数