摘要
To address the control of low frequency noises,we propose an new perforated thin-plate acoustic metamaterials with the attachable Helmholtz resonator(AHR)which can be directly attached to the existing structure to suppress acoustic radiation.Sound transmission loss of the aluminium plate with AHR has been simulated using the finite element method under a normal incident plane sound wave.The results show that AHR works well in the 50—500 Hz frequency band,with two peaks of insulation occurring and the corresponding frequency of the first insulation peak dropping to around 120 Hz.The study of the effects of plate thickness,cavity depth,perforation radius and perforation length on the sound insulation performance of metamaterials demonstrates that the effective suppression of acoustic radiation at specific frequencies can be achieved by changing the acoustic radiation properties of the structure.
针对低频噪声的控制问题,提出了一种新的穿孔薄板声学超材料,其具有可贴附的Helmholtz共鸣器(Attachable Helmholtz resonator,AHR),底面可以直接贴附在需要抑制声辐射的结构上。通过使用有限元方法研究了贴附AHR的铝板在垂直入射的平面波下的声传输损失。研究结果表明,AHR在50~500 Hz频段内隔声表现良好,出现了2个新的隔声峰。首个新隔声峰值对应的频率降至了120 Hz左右。研究板厚、腔深、穿孔半径和穿孔长度对超材料隔声性能的影响,证明可以通过改变结构的声辐射特性,实现对特定频率声辐射的有效抑制。
作者简介
Corresponding authors:SHEN Cheng,Dr.,E-mail addresses:cshen@nuaa.edu.cn,graduated in composite engineering from Harbin Institute of Technology,Harbin,China,in 2008,and received Ph.D.degree in solid mechanics from Xi’an Jiaotong University,Xi’an,China,in 2014.He is currently an associate professor in structural mechanics at the State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,China.His research interests include vibration and acoustic properties of aerospace structures;Corresponding authors:YANG Shasha,Dr.,E-mail addresses:2016100849@niit.edu.cn.received the B.S.and Ph.D.degrees from Xi’an Jiaotong University,Xi’an,China,in 2008 and 2016,respectively.She is currently a lecturer in Nanjing Vocational University of Industry Technology,Nanjing,China.Her research interests include dynamic properties of intelligent materials and structures;ZUO Hongwei,received the B.S.and M.S.degrees in engineering mechanics from Nanjing University of Aeronautics and Astronautics,Nanjing,China,in 2019 and 2022,respectively.His main research interests include vibration and acoustic properties of aerospace structures
