摘要
为了有效控制低频宽带噪声,提出了一种基于亥姆霍兹共振器的双局域共振效应声学超材料。声学超材料将亥姆霍兹共振效应与弹簧质量共振效应结合,通过驱动电压控制薄膜变形,实现两个系统的共振频率同时发生变化。在建立系统数学模型的基础上,计算得到亥姆霍茨共振系统固有频率为414.1Hz,柔性薄膜系统固有频率为28.68Hz,与柔性薄膜的共振频率理论计算偏差为4.4%,与亥姆霍兹共振腔的共振频率理论计算偏差为0.97%。利用COMSOL软件的声固耦合物理场研究了声学超材料的声学性能,采用双负载法对声学超材料进行测试。结果表明:该声学超材料在低频范围内有良好的噪声控制效果,产生两个传递损失峰值,形成了双局域共振效应,可以同时对两个频率范围内的噪声进行控制。当驱动电压从0V增加至350V时,弹簧质量系统传递损失峰值频率从30Hz偏移到110Hz,变化率为22.8%,可以实现噪声的自适应控制,为声学超材料主动控制及优化提供一种方法。
In order to effectively control low-frequency broadband noise,a dual local-domain resonance effect acoustic metamaterial based on Helmholtz resonator was proposed.The acoustic metamaterial was used to combine the Helmholtz resonance effect with the spring mass resonance effect,and control the deformation of the film by the driving voltage to realize the simultaneous change of the resonance frequencies of the two systems.On the basis of establishing the mathematical model of the system,the calculated natural frequency of the Helmholtz resonance system was 414.1 Hz,the natural frequency of the flexible film system was 28.68 Hz,and the theoretical deviation of the resonant frequency from the flexible film was 4.4%.The theoretical calculation deviation of the resonant frequency of the resonant cavity was 0.97%.The acoustic properties of acoustic metamaterials were studied using the acoustic-solid coupling physics of COMSOL software,and the acoustic metamaterials were tested using the dual load method.Results showed that the acoustic metamaterial had good noise control effect in the low frequency range,and generated two transmission loss peaks,forming a double local resonance effect,which can simultaneously control the noise in the two frequency ranges.When the driving voltage increased from 0 Vto 350 V,the spring mass system transmission loss peak frequency was shifted from 30 Hz to 110 Hz,and the rate of change was 22.8%,which can realize adaptive control of noise and provide a method for active control and optimization of acoustic metamaterials.
作者
张晓光
吕海峰
吕传茂
张文辉
ZHANG Xiaoguang;LU Haifeng;LU Chuanmao;ZHANG Wenhui(School of Mechanical Engineering,North University of China,Taiyuan 030051,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2020年第1期52-59,共8页
Journal of Aerospace Power
基金
国家自然科学基金(51305409)
山西省青年科技研究基金(2013021020-2)
山西省高等学校优秀青年学术带头人支持计划
山西省131工程领军人才支持计划.
关键词
低频噪声
双局域
共振效应
声学超材料
消声性能
low frequency noise
dual locality
resonance effect
acoustic metamaterial
muffling performance
