北京地铁5号线高架结构的辐射噪声分析与实验研究  

Analysis and Experimental Study on the Radiation Noise of the Elevated Structures of Beijing Metro Line 5

作　　者：高飞[1] 夏禾[1] 安宁[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《中国铁道科学》2010年第5期134-139,共6页China Railway Science

基　　金：北京市自然科学基金资助项目(8082021)

摘　　要：在试验和分析噪声源特性的基础上,对由结构噪声和轮轨噪声引起的高架结构附近的噪声传播规律进行研究,应用声学理论建立列车通过高架桥梁时的噪声预测模型。在北京地铁5号线高架桥梁试验段进行的现场噪声测试结果表明:用模型计算出的声压值与实测值的误差基本控制在5%以内,模型较为真实地反映了轨道交通高架结构附近的声场分布;在高架桥梁任一竖直平面内,较强的噪声级主要集中在桥梁的中部;梯形轨枕轨道具有良好的减振降噪作用,在低频处的振动速度最大值可降低70%以上,结构辐射噪声最大可降低2.4 dB。The laws of the noise radiation nearby the elevated structures induced by the structural noise and the wheel-rail noise was studied based on the analysis of the characteristics of the noise sources and experiments.Furthermore,the noise prediction model for a train traveling through an elevated structure was set up by the acoustic theory.A site test of the noise was conducted in the test section of an elevated bridge on Beijing Metro Line 5.Test results show that the error between the sound pressure value obtained by the model and the measured value is within 5%,which indicates that the model can precisely simulate the actual sound field distribution nearby the elevated structures of rail transit.Intensive noise level mainly locates in the middle of the bridge in every upright plane of the elevated bridge.Besides,the ladder sleeper track works well for shock absorption and noise reduction.The vibration velocity at the lower frequency can be reduced by over 70% and the structural noise radiation can be reduced farthest by 2.4 dB.

关 键 词：辐射噪声 高架桥梁 噪声预测 模型 噪声分析 轨道交通 

分 类 号：U448.21[建筑科学—桥梁与隧道工程] TB532[交通运输工程—道路与铁道工程]