考虑多普勒效应的城市轨道交通高架桥噪声特性分析  

Characteristics Analysis of Urban Rail Viaduct Structure Noise Considering Doppler Effect

作　　者：于龙波 卜征 李莉 朱茜 雷震宇 罗雁云 YU Longbo;BU Zheng;LI Li;ZHU Qian;LEI Zhenyu;LUO Yanyun(Institute of Rail Transit,Tongji University,201804,Shanghai,China;不详)

机构地区：[1]同济大学铁道与城市轨道交通研究院,上海201804 [2]上海市轨道交通结构耐久与系统安全重点实验室,上海201804 [3]上海汽车集团股份有限公司商用车技术中心,上海200041

出　　处：《城市轨道交通研究》2020年第12期74-79,85,共7页Urban Mass Transit

基　　金：国家自然科学基金项目(51408434,11772230,51678446);中央高校基本科研业务费专项资金项目(22120180250)。

摘　　要：通过对普通道床的城市轨道交通高架桥及周围环境的实地噪声测试,分析比较箱型梁上与梁侧噪声的频谱特性以及桥侧噪声不同频段的能量分布,分析多普勒效应对频移的影响范围。编制基于偏相干理论的Matlab仿真程序,建立多输入-单输出仿真模型,计算桥梁结构噪声和轮轨噪声的在峰值重迭频率对应的1/3倍频程中心频率处的相关程度及贡献度。结果表明:250 Hz以下的低频段,城市轨道交通高架桥噪声主要由轮轨噪声贡献;高架桥近地面的声影区与远桥处综合噪声区噪声主要由桥梁结构噪声贡献,且桥梁各板件的贡献程度不同,按大小依次为底板、翼缘板、腹板;结构噪声控制应重点关注底板。Through field measurements of noise on and around the urban rail transit elevated line with common slab track,the spectrum characteristics of the noise on top of and on side of box type beam are analyzed and compared,as well as the energy distribution characteristics of the noise on side of the viaduct in different frequency bands.The influence range of Doppler Effect on frequency shift is analyzed.A Matlab simulation program is built based on the partial coherence theory,multi-input and single-output simulation model is established.The correlation and contribution of bridge structure-borne noise and wheel-rail noise at 1/3 octave of the overlapping frequency are calculated.The results show that in low frequency band under 250Hz,urban rail transit elevated line bridge noise is contributed mainly by wheel-rail noise;in the sound shadow area of the bridge close to the ground and the comprehensive noise area far from the bridge,the noise is mainly contributed by the bridge structure-borne noise,and different parts of the bridge plates have different impacts that from most to least are the bottom,the flange and the web.Structure noise control should emphasize on the bottom.

关 键 词：城市轨道交通 高架桥 噪声特性 多普勒效应 声学贡献度 

分 类 号：U211.3[交通运输工程—道路与铁道工程] U233