基于嵌入式粗糙颈亥姆霍兹共振器的低频宽带通风消声器  

A low-frequency wideband ventilation muffler based on an embedded rough-necked Helmholtz resonator

作　　者：李婷 吴丰民 张同涛 王军军 杨彬[2] 章东 Li Ting;Wu Feng-Min;Zhang Tong-Tao;Wang Jun-Jun;Yang Bin;Zhang Dong(School of Science,Harbin University of Science and Technology,Harbin 150080,China;School of Instrumentation Science and Engineering,Harbin Institute of Technology,Harbin 150080,China;School of Physics,Nanjing University,Nanjing 210093,China)

机构地区：[1]哈尔滨理工大学理学院,哈尔滨150080 [2]哈尔滨工业大学仪器科学与工程学院,哈尔滨150080 [3]南京大学物理学院,南京210093

出　　处：《物理学报》2023年第22期210-219,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11934009)资助的课题。

摘　　要：针对目前亥姆霍兹共振器的低频吸声效果不理想的问题,提出了一种粗糙颈管亥姆霍兹共振器吸声体,将粗糙度引入亥姆霍兹共振器的颈管,改变经典亥姆霍兹共振器颈管形状并构建粗糙颈管亥姆霍兹共振器吸声体结构,可以在不改变整体尺寸的前提下,有效地为吸声器提供低频吸声所需的声阻抗,从而降低共振频率.利用有限元法对结构进行了仿真并通过阻抗管吸声测试进行验证,实验与仿真具有较高的一致性.基于以上验证,颈管引入粗糙度后可以有效降低亥姆霍兹共振器吸收峰值频率,设计了8个吸声单元紧凑组合的粗糙颈管低频宽带通风消声器.相比于光滑颈管的消声器,吸声效果由500—1100 Hz频段内0.8以上的宽频吸声优化为400—1200 Hz频段内0.8以上的吸声效果,可为低频宽带通风消声器的设计与优化提供参考.Aiming at the unsatisfactory low-frequency sound absorption effect of Helmholtz resonator,a novel broadband low-frequency ventilation absorber with rough neck is proposed.The roughness is introduced into the neck of Helmholtz resonator to change the shape of the neck and achieve the structure of rough neck Helmholtz resonator.The proposed absorber can effectively provide the acoustic impedance required for lowfrequency sound absorption without changing the overall size,thereby reducing the resonant frequency.The finite element method is used to simulate the structure,and the impedance tube sound absorption test is carried out to verify it.The experimental and simulation results show high consistency with each other.The results also indicate that the rough neck Helmholtz resonator absorber with roughness introduced in the neck achieves an absorption peak at 58 Hz,with an absorption coefficient of about 0.63.Comparing with the absorber without roughness introduced,the resonant peak frequency becomes low,from 70 Hz to 58 Hz,reducing 17.1%.Therefore,adjusting the neck roughness can serve as a method of tuning the acoustic performance,and the absorption peak frequency can be adjusted by appropriately increasing the neck roughness so as to move it in the low frequency direction.Based on the verification that the roughness of the neck can effectively reduce the absorption peak frequency of Helmholtz resonator,a broadband low-frequency ventilation absorber with a rough neck,which is composed of eight absorption units,is designed.Through simulation calculation and experimental exploration,the absorption coefficient can achieve more than 0.8 in a target working frequency band of 500-1100 Hz.On this basis,the acoustic impedance of the structure can be adjusted by introducing roughness into the neck of Helmholtz resonator,so as to obtain the optimized broadband low-frequency ventilation absorber with a rough neck,which achieves a broadband sound absorption coefficient higher than 0.8 in a frequency range of 400–1200 Hz.The

关 键 词：亥姆霍兹共振器 粗糙颈管 低频吸声 声阻抗 

分 类 号：TB535.2[理学—物理]