车辆前制动盘三维温度场模拟研究

Study on Temperature Field for Vehicle Front Brake Disc

为得到车辆制动盘的温度场分布,通过建立制动盘的三维温度场分布数学模型,分别计算1次常用制动、3次常用制动2种工况下制动盘的温度变化情况,考虑比热容、导热系数等参数随温度变化的影响,利用ANSYS模拟制动盘的制动过程。仿真结果表明:车辆在时速为90 km/h下进行1次常用制动,制动12.5 s后制动盘的最高温度达到145℃,3次常用制动制动62.5 s后最高温度达到340℃;制动初期盘面温度升高非常快,达到峰值后,制动盘逐渐经换热对流等方式散热,温度缓慢下降;相对1次常用制动,3次常用制动的温度明显升高;增大比热容和导热系数大可有效改善制动盘的温升。

In order to obtain temperature field distribution, two situations are calculated including one time regular brake and three times brake. Considering the influence of the chance of specific heat and thermal conductivity to temperature, the simulation of braking process is operated using software ANSYS. The results show that the disc temperature can reach as high as 145℃ in 12.5s after one regular braking with velocity 90 km/h. Temperature can reach 340℃ in 62.5s after braking 3 times. In the beginning of braking, the temperature of disc rises rapidly with the intensive heat flow input, and the temperature drop slowly after its peak through convection. Compared with one braking, the temperature for braking 3 times is obviously high . Increase in specific heat and thermal conductivity can effectively improve the temperature of brake disc.