Noise control of a local-resonant acoustic metamaterials

被引：0
|
作者：
Lü H. [1 ]
Wang P. [1 ]
Ye J. [1 ]
Zhang W. [1 ]
Zhang X. [1 ]
Li J. [1 ]
机构：
[1] School of Mechanical Engineering, North University of China, Taiyuan
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2020年 / 35卷 / 07期
关键词：
Acoustic metamaterials; Frequency control; Local resonance; Tension adjusting; Transmission loss;
D O I：
10.13224/j.cnki.jasp.2020.07.004
中图分类号：
学科分类号：
摘要：
In order to control the wide-band noise, An acoustic metamaterial with both Helmholtz resonance and spring mass system resonance and its control method were proposed.. The double local resonance system was equivalent to the series connection of two spring mass systems. Theoretical results showed that two local resonance band gaps can be generated in the double resonance acoustic metamaterials. The correctness of the mathematical model was verified by the Finite Element Method. Based on the comparison of the influences of resonant volume and membrane tension on the transmission loss of the system, the pneumatic modulation was selected to control the tension of the membrane and then the transmission loss. The measurement indicated that, when the driving air pressure increased from 0 to 2kPa, the first transmission loss peak of the system kept almost constant while the second transmission loss peak shifted 150Hz to the high frequency. The designed local resonance acoustic metamaterials have good control effect on low-frequency noise in the band gap range, thus providing a method for adaptive control of broadband noise. © 2020, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：1369 / 1375
页数：6
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