虚拟激励作用下桥上列车安全性分析

发布时间：2018-06-13 16:52

本文选题：车桥系统 + 车辆模型　；参考：《湘潭大学》2014年硕士论文

【摘要】：随着高速铁路的不断兴建和列车运行速度的逐步提高，以及载重的不断增加，车桥系统的动力相互作用问题越来越成为一个影响车辆安全运行和桥梁正常使用的重要因素。由于车桥耦合振动是一个综合了随机性、自激性和时变性于一体的动力学问题，这使得此问题的研究有着很大的复杂性和困难性。车桥耦合振动问题一直是各国学者致力研究的一大难点和热点。本文介绍了车桥耦合振动研究的历史和现状，对前人的研究成果进行了总结；根据Lagrange方程，，推导了23个自由度的四轴车辆的运动方程；同时对轮轨接触关系进行了分析和求解。轮轨关系是车桥耦合振动系统的连接纽带，本文在分析车辆动力响应中，把轮轨力考虑为外部激励，再虚拟横向静风力外部激励的作用，然后对秦沈客运专线狗河特大桥和8节车厢的列车进行研究，通过Matlab软件编制了计算程序，利用Newmark-β逐步积分法对车辆动力响应进行了数值计算。然后考虑了不同风速与不同行车速度这两种因素对列车的影响，得到了车辆动力响应的5个分析指标，即脱轨系数、轮重减载率、轮轨横向力、车体加速度和Sperling舒适度指标，最后对桥上运行列车的安全性进行分析。结果表明，随着风速或车速的增大，车辆的动力响应都呈一定的增长趋势，其中以车体加速度和轮重减载率的变化最为显著，甚至会超过安全限值，不利于列车安全运行。
[Abstract]:With the increasing of the construction of high - speed railway and the increasing speed of train operation and the increasing load , the problem of dynamic interaction of axle system has become an important factor which affects the safe operation of vehicle and the normal use of bridge .

This paper introduces the history and present situation of coupling vibration of axle and bridge , and summarizes the previous research results .
According to the Lagrange equation , the motion equations of the four - axis vehicles with 23 degrees of freedom are derived .
In this paper , the relationship between wheel and rail is analyzed and solved . The relationship between wheel and rail is the connecting link of axle coupling vibration system . In this paper , the influence of different wind speed and different driving speed on the train is analyzed . The results show that the dynamic response of the vehicle increases with the increase of wind speed or vehicle speed . The results show that , with the increase of wind speed or vehicle speed , the dynamic response of the vehicle is the most significant , which can even exceed the safety limit value , which is not harmful to train safe operation .
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3;U211

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