周向接触弧长对闸片温度场分布影响的研究

Study on Effects of Circumferential Arc Length on Distribution of Temperature on Pad

提出了热流分配系数受摩擦副周向接触弧长影响的观点;使用分段二次插值法确定了摩擦副周向接触弧长和热流分配系数随径向位置的变化关系;基于能量守恒法,计算和比较了2种不同热载荷下闸片的温度及其分布规律。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,而热流分配系数的变化趋势正好与其相反;由2种不同热载荷计算得到的温度峰值发生时刻虽接近,但差值较大;温度在径向和轴向方向上的分布规律也不相同。因此,在摩擦副的热分析过程中必须考虑闸片结构带来的影响。

The viewpoint that heat partition coefficient affected by the circumferential contact arc length of the brake pair was brought forward. The circumferential contact arc length and the heat partition coefficient,which was changing with radial distance,were determined by quadratic interpolation function method. The temperature and its distributions of the brake pad were calculated and compared by two different thermal loads based on Energy Balance Law. The results show that the circumferential contact arc length will increase firstly and then decrease with the increase of radial distance,while the heat partition coefficient is in the opposite situation. Although the time when peak temperatures happen of two different thermal loads are almost the same,the temperature difference is high and it also has a different temperature distribution both in axial and radial direction of the pad. Therefore,the geometry of the brake pad must be taken into the consideration during the thermal analysis of brake pair.