针对交通环境减振的超表面型波屏障  

METASURFACE WAVE BARRIERS FOR AMBIENT VIBRATION MITIGATION

作　　者：倪安辰 石志飞[1] 孟庆娟 NI An-chen;SHI Zhi-fei;MENG Qing-juan(Institute of Smart Materials and Structures,Beijing Jiaotong University,Beijing 100044,China;School of Civil Engineering,Tangshan University,Tangshan 063002,China)

机构地区：[1]北京交通大学智能材料与结构研究所,北京100044 [2]唐山学院土木工程学院,唐山063002

出　　处：《工程力学》2024年第S01期317-325,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(52178269)。

摘　　要：针对轨道交通带来的环境振动问题,以表面波作为控制对象,通过在地表下周期浅埋填充管,设计了一种新式超表面型波屏障,并进行了系统的频散分析,传输特性仿真与实验测试,所得主要结论如下:由于填充管竖向共振与表面波间的强互相作用,表面波衰减域被打开,衰减域的作用频率及宽度与填充管的自振特性密切相关,可以通过材料与几何参数进行灵活调整;衰减域范围内,表面波得到了有效的控制,且随着周期数的增加,衰减域内减振效果逐渐提升,无论主、被动隔振,超表面型波屏障都可以起到良好的隔振效果;实验验证了超表面型波屏障减振的高效性,衰减域内平均插入损失可达9.8 dB,表面波向体波的模式转化是其主要作用机理;一定程度施工误差(≤10%)的引入不会影响衰减域内的减振效果,实验结果证明了超表面型波屏障减振具有高效性与鲁棒性;通过输入实测的地铁环境振动信号,超表面型波屏障应用于环境减振的可行性也得到了初步验证。超表面型波屏障具有减振高效稳定、设计灵活和施工便利的优势,在轨道交通环境减振领域具有良好的应用前景。To mitigate the ambient vibration induced by trains,a novel metasurface wave barrier is designed in this work by periodically arranging the underground in-filled pipes.Systematic dispersion analysis,transmission simulation and experimental study are conducted.The main conclusions are obtained as follows:the surface wave attenuation zone(SWAZ)is opened due to the strong interaction between vertically resonance of in-filled pipes with surface waves.The position and width of SWAZ are mainly affected by the local resonance characteristics of in-filled pipes,which can be designed by adjusting the material and geometrical parameters.Significant surface wave attenuation is observed within the SWAZ,and the performance is strengthened with the increase of rows.Besides,this novel wave barrier is suitable for not only active isolation but also passive isolation.Experimental results confirm the excellent vibration mitigation within SWAZ of metasurface wave barriers.The average insertion loss within SWAZ is 9.8 dB.The main working mechanism is the mode conversion from surface waves to shear bulk waves.The introduction of certain degrees of construction errors(≤10%)doesn’t affect the existence of SWAZs.High efficiency and robustness of vibration mitigation of metasurface wave barriers are verified by numerical and experimental studies.By inputting the measured train-induced acceleration into the numerical model in the time domain,the feasibility of metasurface wave barriers to ambient vibration mitigation is preliminarily verified.Due to the high efficiency,robust performance and low cost of metasurface wave barrier,it has great potential for ambient vibration mitigation induced by trains.

关 键 词：环境减振 超材料 波屏障 频散分析 数值模拟 实验研究 

分 类 号：U239.5[交通运输工程—道路与铁道工程]