吊弦非均布下400 km/h接触网动态性能提升研究

Research on the Dynamic Performance Improvement of 400 km/h Catenary under Non-uniform Distribution of Droppers

研究目的:本文聚焦接触网吊弦的间距及其分布,研究其对400 km/h接触网动态性能的提升效果,为400 km/h高速接触网吊弦的非均布设计提供指导。首先,采用线路实测的定位点抬升位移曲线验证弓网耦合动力学仿真模型建模方法的合理性,分别建立3种不同跨距(45 m、50 m和55 m)的弓网耦合动力学仿真模型。然后,以吊弦距定位点的距离即吊弦的非均布方案为输入变量设计实验,再进行弓网耦合动力学仿真,提取接触力标准差作为输出变量。采用BP神经网络建立输入-吊弦布置方案和输出-接触力标准差之间的关系模型,当模型的拟合优度和预测精度满足要求时,再采用遗传算法搜寻该神经网络模型中使输出接触力标准差最小时的输入变量,即最优的吊弦非均布设计方案。研究结论:(1)BP神经网络和遗传算法相结合可以有效地进行吊弦的非均布设计;(2)提出了跨距为45 m、50 m和55 m的接触网中吊弦的最优非均布设计方案;(3)吊弦非均布对400 km/h接触网动态性能有较大的提升效果,接触力标准差分别降低了34.8%、39.3%和18.0%;(4)本研究成果可为400 km/h高速铁路接触网的参数设计提供指导。

Research purposes:This paper focuses on the spacing and distribution of catenary droppers,and studies its improvement fect on the dynamic performance of 400 km/h catenary,providing guidance for the non-uniform design of catenary droppers at 400 km/h high speed.Firstly,the rationality of the modeling method of the pantograph-catenary coupling dynamics simulating model is verified by the line-tested uplift displacement curve of the positioning point,and three simulating models with different spans of 45 m,50 m and 55 m are established,respectively.Then,the experiments are designed with the distance from the dropper to the positioning point,that is,the non-uniformly-distributed scheme of droppers as the input variable.The pantograph-catenary coupling dynamics simulations are carried out according to the designed experiment,and the standard deviation of contact force is extracted as the output variable.BP neural network(BPNN)is used to establish the relationship model between the input and output.When the fiting goodness and the predicting accuracy of the BPNN model all meet the requirements,genetic algorithm(GA)is subsequently used to search for the input variable(the optimal non-uniformly-distributed scheme of droppers)of the BPNN model which minimizes the standard deviation of contact force.Research conclusions:(1)The method of BPNN combined with GA can efectively conduct the non-uniformly-distributed design of the droppers.(2)The optimal non-uniform distribution design of droppers in catenary with spans of 45 m,50 m and 55 m is proposed.(3)The uniform distribution of droppers has a greater effect on the dynamic performance of the 400 km/h catenary,and the standard deviation of the contact force is reduced by 34.8%,39.3%and 18.0%,respectively.(4)This research achievement can provide guidance for the parameter design of 400 km/h high-speed railway catenary.