Sound Transmission Comparisons of Active Elastic Wave Metamaterial Immersed in External Mean Flow

作     者：Zhi-Hua He Yi-Ze Wang Yue-Sheng Wang Zhi-Hua He;Yi-Ze Wang;Yue-Sheng Wang

作者机构：Institute of Engineering MechanicsBeijing Jiaotong UniversityBeijing 100044China Department of MechanicsTianjin UniversityTianjin 300350China 

出 版 物：《Acta Mechanica Solida Sinica》 (固体力学学报（英文版）)

年 卷 期：2021年第34卷第3期

页      面：307-325页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 080102[工学-固体力学] 

基　　金：The authors wish to express gratitude for the support provided by the National Natural Science Foundation of China(Grant Nos.11922209 11991031 and 12021002) 

主　　题：Elastic wave metamaterials Active feedback control Dynamic equivalent method Sound transmission External mean flow 

摘      要：Using the active feedback control system on the elastic wave metamaterial,this research concentrates on the sound transmission with the dynamic effective *** metamaterial is subjected to an incident pressure and immersed in the external mean *** elastic wave metamaterial consists of double plates and the upper and lower four-link mechanisms are attached *** vertical resonator is attached by the active feedback control system and connected with two four-link *** on the dynamic equivalent method,the metamaterial is equivalent as a single-layer plate by the dynamic effective *** the coupling between the fluid and structure,the expression of the sound transmission loss(STL)is *** research shows the influence of effective mass density on sound transmission properties,and the STL in both modes can be tuned by the acceleration and displacement feedback *** addition,the dynamic response and the STL are also changed obviously by different values of structural damping,incident angle(i.e.,the elevation and azimuth angles)and Mach number of the external fluid with the mean flow *** results for sound transmission by two methods are compared,i.e.,the virtual work principle for double plates and the dynamic equivalent method corresponding to a single *** paper is expected to be helpful for understanding the sound transmission properties of both pure single-and double-plate models.