Page 77 - 应用声学2019年第2期

第 38 卷 第 2 期 Vol. 38, No. 2
2019 年 3 月 Journal of Applied Acoustics March, 2019

⋄ 研究报告 ⋄

膨胀腔类超材料的传递损失 ∗

邢 拓 † 李贤徽 盖晓玲 蔡泽农 王 芳 关淅文

(北京市劳动保护科学研究所 环境噪声与振动北京市重点实验室 北京 100054)
摘要 声学超材料及结构已被广泛研究，其超结构通常利用 3D 打印技术实现，当结构刚度较小或者面积较大
时，由声固耦合所导致的声学效果与设计不符的情况广泛存在。该文针对含有膨胀腔类的超材料，研究了声固
耦合对其声学性能的影响，采用有限元计算结合阻抗管实验的方法，得到其传递损失，分析了声固耦合现象对
传递损失的影响。结果表明：薄壁膨胀腔结构的作用频率范围与只考虑声学理论计算的设计不符，声固耦合现
象对传递损失产生显著影响；采用增加膨胀腔壁厚、减少膨胀腔内径或选择金属材料的方式，都可以使得声固
耦合现象对传递损失的影响减小；仿真结果与实验结果基本吻合。对于膨胀腔类超材料，当刚度较小或者面积
较大时，对其进行声固耦合分析是完全必要的。
关键词 超材料，膨胀腔，声固耦合，隔声
中图法分类号: TB565 文献标识码: A 文章编号: 1000-310X(2019)02-0223-07
DOI: 10.11684/j.issn.1000-310X.2019.02.011

Transmission loss of expansion chamber metamaterial

XING Tuo LI Xianhui GAI Xiaoling CAI Zenong WANG Fang GUAN Xiwen

(Beijing Municipal Institute of Labour Protection, Beijing Key Laboratory of Environment Noise and
Vibration, Beijing 100054, China)

Abstract Acoustic metamaterials and artificial structures have been extensively studied. This superstructure
was usually implemented using 3D printing technology. When the structural rigidity is small or the area is
large, the acoustic effects caused by the acoustic-solid coupling do not conform to the design. In this paper,
the effects of acoustic-solid coupling on the acoustic properties of expansion chamber acoustic metamaterials
are investigated. The finite element analysis combined with the impedance tube experiment method is used to
obtain the transmission loss, and the influence of the acoustic-solid coupling phenomenon on the transmission
loss is analyzed. The results show that the frequency range of sound insulation of the thin-walled expansion
chamber is inconsistent with the theoretical design without considering the acoustic-solid coupling. The trans-
mission loss is significantly affected by the acoustic-solid coupling phenomenon. Increasing the wall thickness of
the expansion chamber, reducing the inner diameter of the expansion chamber or selecting the metal material
can reduce the influence of the acoustic-solid coupling phenomenon on the transmission loss. The simulation
results are basically consistent with the experiment results. This indicates that acoustic-solid coupling analysis
of the expansion chamber metamaterial is absolutely necessary when the stiffness is small or the area is large.
Key words Metameterial, Expansion chamber, Acoustic-solid coupling, Sound insulation

2018-08-09 收稿; 2018-10-15 定稿
国家自然科学基金项目 (11604015), 北京市自然科学基金项目 (1172007, 1182011), 北京市财政项目 (PXM2018_178304_000008)
∗
作者简介: 邢拓 (1991- ), 男, 陕西宝鸡人, 硕士, 研究实习员, 研究方向: 噪声与振动控制。
† 通讯作者 E-mail: xingtuo1991@163.com