高速铁路声屏障动力性能检测及评价方法研究  

Detection and evaluation method for dynamic performance of high-speed railway sound barrier

作　　者：陈兴 潘永琛 周铁军 伍向阳 刘兰华 CHEN Xing;PAN Yongchen;ZHOU Tiejun;WU Xiangyang;LIU Lanhua(Energy Saving&Environmental Protection&Occupational Safety and Health Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司节能环保劳卫研究所,北京100081

出　　处：《铁道科学与工程学报》2024年第11期4395-4404,共10页Journal of Railway Science and Engineering

基　　金：中国国家铁路集团有限公司科技研究开发计划项目(K2022G016);中国铁道科学研究院集团有限公司基金资助项目(2021YJ158)。

摘　　要：掌握铁路声屏障服役状态对指导运维养护具有重要作用,如何有效检测并表征结构动力性能是目前的难题之一。基于现行技术标准分析,采用理论分析、数值仿真与现场试验相结合的方法,开展声屏障动力性能检测及评价方法研究。通过声屏障气动仿真分析与动力性能试验,识别气动荷载的垂向分布规律,研究结构振动随运行速度的变化特征,分析主要构件间的动力传递关系与力学响应行为,进而提出可反映声屏障本体质量的检测与评价指标,并通过试验验证其有效性与适应性。研究结果表明:伴随列车运行速度提升引起气动作用加剧,声屏障结构振动增大,但主要构件振动响应的变化规律存在差异。受附加惯性效应影响,立柱动刚度相对值随速度提升呈下降趋势;单元板动刚度相对值基本稳定且呈现非线性特征,与板-柱接触状态有关。基于声屏障气动荷载垂向分布与非线性耦合动力作用特征,提出刚度系数检测评价新指标。经现场验证,声屏障检测评价方法能够消除列车运行速度、车型、声屏障设置位置与高度等因素的影响,检测结果受气动荷载变化引起的最大波动范围在±17%以内,解决了既有结构刚度检测指标与实际检测工况匹配性不佳、检测结果受气动荷载影响显著等问题,可为铁路声屏障全寿命周期管理提供科学手段。The service state of railway sound barrier is important for operation and maintenance.It is still a challenge to detect and characterize the dynamic performance of sound barrier effectively.Based on current technical standards,the detection and evaluation method for dynamic performance of sound barrier was studied by combining theoretical analysis,numerical simulation and field test.The CFD simulation model was established to investigate the vertical distribution of aerodynamic load.The dynamic performance of sound barrier was measured for obtaining structural vibration changing with operating speed.According to the dynamic transmission relationship and mechanical behavior of the main components,the detection and evaluation indicators,which could represent the intrinsic quality of sound barrier,were proposed and verified.The research result shows that the vibration of sound barrier intensifies with the improvement of train speed due to aerodynamic load.However,the vibration response characteristics of the main components exist differences.The relative dynamic stiffness of column decreases with the improvement of train speed,mainly related to additional inertial force.The relative dynamic stiffness of unit panel can keep stable and exhibits nonlinear characteristics,which is affected by the contact status between the unit panel and the column.The detection and evaluation indicators for the dynamic performance of sound barrier are proposed,considering the vertical distribution of aerodynamic load and nonlinear coupled dynamic effect.The proposed method can eliminate the interference including operating speed,train type,setting position and height of sound barrier.It is verified that the maximum fluctuation of the stiffness coefficients caused by aerodynamic load is within±17%.The proposed method,provided for the full lifecycle management of railway sound barrier,is expected to solve the problems such as mismatch between current indicators and actual test conditions and poor stability of detection data affected by

关 键 词：高速铁路 声屏障 动力性能 检测评估方法 刚度系数 

分 类 号：U213.6[交通运输工程—道路与铁道工程]