基于离散小波变换的接触网横向风振响应研究

摘要

Under the action of transverse wind,the dynamic stability of the catenary system was affected by the lateral shift and vibration.The Davenport power spectrum,applicable to the stochastic wind field calculation for the catenary and unchangeable with height,was used in this simulation model.The wavelet analysis was used to make numerical simulation on the time history of fluctuating wind velocity in the horizontal direction. The differential equation of transverse vibration was proposed innovatively based on the model of the catenary structure.The lateral vibration response of the catenary in straight line section was analyzed by applying the stochastic wind field,average wind load and the maximum wind load to the catenary.The effects of different parameters on the lateral displacements of the catenary were studied .The test results demonstrated that sto-chastic wind field caused the transverse vibration of the catenary,and the fluctuating wind resulted in slight vi-bration,while the static wind is the maj or factor that affected the scale of the lateral displacement of the cate-nary.The span of the catenary,the wind speed and wind yaw angle affected the stability of the catenary.%接触网在风载作用下发生横向偏移及振动影响接触网系统的动力稳定性。本文采用适合接触网随机风场计算与高度无关的Davenport功率谱，运用小波分析法数值模拟水平方向脉动风速时程。基于铁路接触网结构模型，建立了接触网悬索横向振动微分方程。在此基础上，将随机风场、平均风载及最大风载施加于接触网，分析了直线区段接触网横向风振响应；研究了不同参数对接触网横向风偏的影响。仿真结果表明：随机风场引起接触网的横向振动，脉动风使接触网发生微幅振动，而静态风决定接触网横向风偏均值，是引起接触网横向偏移的主要因素。接触网跨距，风速的大小，风偏角等参数影响接触网的稳定性。