Laminated acoustic metamaterial for improving low-frequency broadband sound insulation of aircraft wall panels

被引：0
|
作者：
Gu J. [1 ]
Wang X. [2 ]
Tang Y. [2 ]
Zhou J. [3 ]
Huang Z. [2 ]
机构：
[1] AVIC The First Aircraft Institute, Xi'an
[2] School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai
[3] School of Aeronautics, Northwestern Polytechnical University, Xi'an
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2022年 / 43卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Acoustic metamaterial; Aircraft siding; Laminated materials; Low-frequency noise; Noise control; Sound insulation characteristics;
D O I：
10.7527/S1000-6893.2020.24785
中图分类号：
学科分类号：
摘要：
Aiming at the problem of low-frequency broadband noise control in the aircraft cabin, a laminated acoustic metamaterial, which is suitable for sound insulation enhancement of aircraft wall panels, is proposed. The laminated acoustic metamaterial is composed of two membrane-constrained acoustic metamaterial panels with different composition parameters in the front and the back, and a porous sound-absorbing material filled in them. By establishing the sound insulation calculating finite element model of laminated acoustic metamaterials, analyzing the relationship between the sound insulation characteristics of each layer of membrane-constrained acoustic metamaterials and the laminated acoustic metamaterials composed of them. And focusing on the mechanism of negative mass effect of laminated acoustic metamaterials on its sound insulation characteristics. Based on the four-microphone acoustic impedance tube test system, the normal incident sound insulation of the laminated acoustic metamaterial is measured to verify the validity of the finite element model. Finally, the insertion loss test of the large-size laminated acoustic metamaterial was carried out in the semi-cancellation chamber. The results showed that the average insertion loss of the laminated acoustic metamaterial samples with an areal density of 1.5 kg/m2 in the low-frequency operating frequency range of 100-500 Hz reaches 14 dB, which reflected the excellent low-frequency broadband sound insulation capability. The research has certain theoretical and engineering guidance value for using thin and light acoustic metamaterials to improve the low-frequency broadband sound insulation performance of aircraft wall panels. © 2022, Beihang University Aerospace Knowledge Press. All right reserved.
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