轨道交通环境振动半解析预测方法  

Semi-analytical Method for Predicting Environmental Vibration Induced by Rail Transit

作　　者：雷晓燕[1] 胡云 司丕贤 LEI Xiaoyan;HU Yun;SI Pixian(MOE Engineering Research Center of Railway Environment Vibration and Noise,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,江西南昌330013

出　　处：《铁道学报》2023年第12期148-156,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(51978264);江西省技术创新引导类计划(20223AEI91004)。

摘　　要：准确预测列车引起的环境振动对轨道交通减振降噪具有重要作用。建立点源冲击荷载作用下的轨道-半无限区域大地模型,推导预测列车在轨道上运行时引起大地振动加速度的解析公式。根据该公式,提出基于模型计算列车荷载密度和现场实测大地线源振动传递导纳的轨道交通环境振动半解析预测方法。为验证预测方法的正确性,选择昌九城际铁路某轨道区域实测大地线源振动传递导纳和地面测点振动加速度响应。根据试验区域的轨道结构类型和开行的列车类型,建立列车-轨道非线性耦合系统动力学模型,运用交叉迭代算法求解列车-轨道耦合系统动力学方程和计算列车荷载密度。运用预测公式得到地面各测点振动加速度级。预测结果与实测数据吻合良好,地面各测点加速度幅值及在频域中的分布规律具有很好的一致性,说明了预测方法的正确性。该方法具有预测精度高,容易实施的特点。Accurate prediction of environmental vibration caused by trains plays an important role in reducing vibration and noise of rail transit.By establishing the track-ground model with semi-infinite region under point source impact load,an analytical formula was derived for predicting the acceleration of ground vibration caused by trains operating on the track.Based on the formula,a semi-analytical method for predicting the environmental vibration induced by rail transit was proposed,which is based on the model for calculating the train load density and the field measurement of the line-source vibration transfer admittance of the ground.In order to verify the accuracy of the prediction method,the line-source vibration transfer admittance and the vibration acceleration response of the ground were measured in a certain region near Nanchang north station of Changjiu Intercity Railway.At the same time,based on the type of the track structure and the trains operating in the test area,by establishing a train-track nonlinear coupled system dynamics model,the cross-iteration algorithm was used to solve the dynamic equations of the train-track coupled system and the train load density.Then,the vibration acceleration levels of each measuring point on the ground were obtained by using the prediction formula.The predicted vibration acceleration and its distribution in frequency domain are in good agreement with the measured data,which shows the correctness of the prediction method.This method features high prediction precision and easy implementation.

关 键 词：轨道交通环境振动 半解析预测方法 列车荷载密度 线源振动传递导纳 列车-轨道非线性耦合系统 交叉迭代算法 

分 类 号：U211.3[交通运输工程—道路与铁道工程] X593[环境科学与工程—环境工程]