城市轨道交通高架桥“降噪型”动力吸振器参数优化  

Parameters optimization of"noise reduction type"dynamic vibration absorber for urban rail transit viaduct

作　　者：周力 张天琦 罗雁云 陈大磊 吴尚 ZHOU Li;ZHANG Tianqi;LUO Yanyun;CHEN Dalei;WU Shang(Institute of Railway and Urban Rail Transit,Tongji University,Shanghai 201800,China;China Railway Shanghai Group Co.Ltd.,Bengbu Track Maintenance Subdivision,Bengbu 233000,China)

机构地区：[1]同济大学铁道与城市轨道交通研究院,上海201800 [2]中铁上海局集团有限公司蚌埠工务段,安徽蚌埠233000

出　　处：《中南大学学报（自然科学版）》2020年第6期1664-1672,共9页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51678446,51708422,51408434)。

摘　　要：针对高架桥动力吸振器不能有效降低桥梁结构噪声的问题,以城市轨道交通中应用较为广泛的箱梁为研究对象,基于车辆荷载作用下振动与噪声试验,结合板件声辐射理论,研究声辐射效率对桥梁结构噪声频谱特征及幅值的影响。在此基础上,根据车-轨-桥有限元仿真得到的箱梁振动与结构噪声频谱结果,合理选择减振目标频段;结合多重动力吸振器(MDVA)参数优化理论,进行参数优化设置,并进一步对比分析有、无MDVA工况下的桥梁振动与结构噪声的差异。研究结果表明:声辐射效率对桥梁结构噪声的频谱特征及幅值的影响不可忽视;该"降噪型"动力吸振器能够在总体振动水平改善幅度不大的情况下获得较好的降噪效果。Considering that dynamic vibration absorber of viaduct cannot effectively reduce the structure-born noise,the box girder commonly used in urban rail transit was taken as the research object.Based on field test of vibration and noise under vehicle load and the plate sound radiation theory,the influence of sound radiation efficiency on the spectrum characteristics and amplitude of bridge structural noise was studied.According to the frequency spectrum results of vibration and structural noise of box girder obtained by finite element simulation of vehicle−rail−bridge,the target frequency band of vibration reduction was reasonably selected.Based on the parameter optimization theory of multi-dynamic vibration absorber(MDVA),the relevant parameters were optimized.Furthermore,the differences of bridge vibration and structural noise under MDVA and non-MDVA conditions were compared and analyzed.The results show that the influence of the sound radiation efficiency on spectrum characteristics and amplitude of bridge noise cannot be ignored.The"noise reduction type"MDVA can achieve better noise reduction effect with little improvement in the overall vibration level.

关 键 词：城市轨道交通 箱梁 动力吸振器 参数优化 减振与降噪 

分 类 号：U24[交通运输工程—道路与铁道工程] TB123[理学—工程力学]