桥上列车脱轨的力学机理、能量随机分析理论及其应用

Mechanical Mechanism and Random Energy Analysis Theory of Train Derailment on the Bridge and Its Application

总结了国内外现有桥上列车脱轨研究中的主要问题。基于物理概念,提出了桥上列车脱轨的力学机理,进一步提出了桥上列车脱轨能量随机分析理论,其主要内容包括:列车脱轨几何准则;能反映轮轨接触状态及相对位移的列车桥梁时变系统空间振动方程组的建立;此系统横向振动激振源的确定;此系统随机横向振动的计算方法;评判列车是否脱轨的能量增量准则。计算了6个桥上列车是否脱轨实例,计算结果均与实际符合,证明这个理论有一定正确性。

Major problems existing in the current research of train derailment on the bridge at home and abroard are summarized. Mechanical mechanism of train derailment on the bridge is presented on the basis of the physical concept. The random energy analysis theory of train derailment on the bridge is more presented, and its major contents include as follows: Geometric rules of train derailment; establishment of the spatial vibration equation set of the train-bridge time-variant system reflecting contact statues and relative displacement between rail and wheel; making certain the exciting source of transverse vibration of the system; method of calculating random transverse vibration of the system; standard rules of energy increment for judging train derailment. Six cases whether trains running on the bridge derail or not are calculated. The conclusion matches with the actual case, which shows this theory is correct.