多胞局域共振型超材料的减振实验研究  

Experimental Study on Vibration Attenuation via a Multi-cell and Locally-Resonant Metamaterial

作　　者：吴昆 高玉强 王立峰[1] 金栋平[1] 胡海岩[1] WU Kun;GAO Yuqiang;WANG Lifeng;JIN Dongping;HU Haiyan(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《南京航空航天大学学报》2022年第5期908-914,共7页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：弹性波/声波超材料具有许多超常力学性质,为航空、航天和船舶等领域的装备减振降噪提供了新途径。本文介绍多胞局域共振型超材料的减振实验研究。该研究基于局域共振元胞的频散分析、波动传递率分析和周期结构的振动响应计算,讨论了超材料在带隙频率区内外的波动传播。设计制造了具有低频带隙的轻质周期性局域共振超材料构型,并用于空间桁架结构的振动抑制实验。实验结果表明,在15~45 Hz的带隙频率区间,多胞超材料减振装置可使振动传递率降低30 dB以上,展现出良好的减振效果。Elastic/acoustic metamaterials hold many exceptional mechanical properties,and provide a new way for the vibration and noise reduction of equipment in aerospace engineering and ship engineering.This paper presents an experimental study on vibration attenuations via a multi-cell and locally-resonant metamaterial.First,the paper discusses the wave propagations of metamaterials inside and outside the bandgap by means of the dispersion analysis,the wave transmissibility analysis,as well as the numerical computations on the vibrations of a periodic metamaterial.Second,the paper introduces a lightweight configuration of periodic locally-resonant metamaterial with bandgaps at the low frequency range.The experimental results show that the vibration transmissibility decreases by 30 dB in the frequency range of 15—45 Hz,exhibiting a good performance of vibration attenuation connecting space truss structure.

关 键 词：多胞超材料 局域共振 减振应用 轻质构型 

分 类 号：V232.4[航空宇航科学与技术—航空宇航推进理论与工程]