摘要
本文设计并研究了一种亚波长厚度、宽带高效的吸声超表面材料,有望应用于航空噪声和振动的控制。首先提出了一种基于局域共振机理的开口空心球(SHS)人工微结构,理论分析和仿真计算表明这种结构的超表面材料在共振频率附近具有较强的吸声率;然后,将不同尺寸的SHS整合在一个结构中设计出嵌套开口空心球(NSHS),在空气基底中制备出NSHS超表面材料可以同时在双频段实现高效率的吸声效应;最后,增加海绵基底后,这种超表面材料可以实现500~1200Hz的宽频吸声效应。
The paper designs and study its a sound absorption metasurface materials with subwavelength thickness and broadband high-efficiency,which may be applied to aeronautical noise and vibration reduction.Firstly,the paper presents an artificial microstructure of split hollow sphere(SHS).The theoretical analysis and simulated calculation demonstrate that this structure has acoustic resonant effect.The SHS materials reveal strong sound absorption near the resonant frequency.Then,nested SHS(NSHS)model can be designed by integrating two different sized SHS into a single structure.The NSHS metasurface materials fabricated by arranging designed NSHS in air matrix present high-efficient sound absorption in two frequency band simultaneously.Finally,the NSHS materials with sponge matrix achieve broadband high sound absorption in low frequency range of 500-1200Hz.
作者
丁昌林
史剑兵
董仪宝
赵晓鹏
Ding Changlin;Shi Jianbing;Dong Yibao;Zhao Xiaopeng(Northwestern Polytechnical University,Xi’an 710129,China)
出处
《航空科学技术》
2022年第5期76-81,共6页
Aeronautical Science & Technology
基金
航空科学基金(2018ZF53071)。
