基于功能转化原理的车辆—轨道系统脱轨安全性研究

Research on the Derailment Security of Vehicle-Track System Based on Functional Transformation Theory

车辆—轨道系统具有非线性和随机性的特点,评价车辆—轨道系统的脱轨安全性时,必须同时考虑车辆和轨道二者的动力特性。根据功能转化和能量守恒定理,将车辆—轨道系统的响应过程视为轮轨力做功与能量的转化过程,对轨道不平顺波长—脱轨系数关系曲线归一化处理,建立权函数,用以表征车辆动力学特性,再用轨道不平顺的功率谱密度表征轨道的能量输入特性,给出评价车辆—轨道系统脱轨安全性的能量系数算法。分析结果表明:能量系数算法克服了脱轨系数基于准静态评价的不足,解决了传统轨道管理体系安全评价方法缺乏对轨道复合不平顺的评估问题。

For the nonlinear and random characteristics of vehicle-track system, the dynamic performance of both vehicle and track must be considered when we evaluate the derailment security of vehicle-track system. According to the work and energy transformation as well as the energy conservation principles, the vehicle-track system dynamic response process can be regarded as wheel-rail forces acting and the energy transformation process. This paper puts forward an energy coefficient algorithm to evaluate the derailment security of vehicle-track system, which characterizes vehicle dynamics by using the weight coefficients which get by normalized track irregularity wavelength-derailment coefficient curve and takes the PSD of track irregularity as energy input performance. The results show that the energy coefficient algorithm o vercomes the lack of derailment coefficient based on the quasi-static evaluation, which can solve the ineffi- ciency of traditional track management in the safety assessment method to the problem of composite track irregularity.