北京地铁10号线制动热响应分析与评估

针对城轨列车转向架基础制动方式,对踏面制动热流密度进行推导,建立了车轮制动过程瞬态温度场和应力场三维有限元模型,重点分析了城轨列车在两次紧急制动和全程往返制动两种极端情况下,车轮踏面温度和热应力变化规律.车轮踏面所受的应力是垂直载荷、横向载荷和热应力综合作用的结果,适用于Hertz接触理论,机械载荷对车轮踏面的作用效果采用Hertz接触应力来衡量,根据温度和热应力模拟结果,评估了城轨列车车轮的服役安全性,为发展城轨列车的制动方式和制动技术提供了比较可信的理论分析方法.

Assessment and analysis on thermal response of tread-braking for Beijing metro line 10 vehicles

Based on the key parameter derivation of the heat flux density on tread-braking mode of ur- ban rail vehicle bogie, an analysis of the change regularity of the transient temperature field and stress field of the wheels are focused by establishing three dimensional finite element model in two extreme cases, that is, twice emergency braking and journey to and fro braking. Wheel tread stress consists of vertical load, horizontal load and thermal stress, which is suitable for Hertz contact theory. Further- more, the effect of mechanical load on the wheel tread can be commonly measured by Hertz contact stress. According to the temperature and thermal stress simulation results, the service safety of wheels of urban rail vehicle had been assessed. The above research provides a reliable theoretical analysis method for the development of braking mode and braking technology of urban rail vehicle.