二维阵列亥姆霍兹共鸣管的声带隙性能

Acoustic Band Gap of Two Dimensional Array of Helmholtz Resonators

摘要:

亥姆霍兹共鸣器是一种最基本的声共振系统,可受外面声场的激发并消耗其能量,形成重要的吸声体结构.其最典型的应用就是音乐厅、电影院吸音墙的微结构.设计了二维的亥姆霍兹共鸣管周期阵列结构,并应用有限元方法计算该结构的声传输特性.计算结果表明,该结构可以利用布拉格散射效应、局域共振效应以及亥姆霍兹共鸣管对声波的吸收效应.与无开口圆管构成的周期结构相比,该结构具有更大的声带隙带宽.因此,该结构可用来设计声屏障、声透镜等声学器件.

Abstract:

Helmholtz resonator is a sound resonant system,which can consume the external sound excitation.It’s an important sound absorption structure,and can be used as the sound absorption wall in the museum and cinema.A two dimensional array of Helmholtz Resonators was designed,and the finite element method was used to calculate the sound transmission properties.The results show that,such a structure may present the Bragg’s scattering mechanism,local resonance mechanism and the Helmholtz resonance mechanism.Compared to the two dimensional acoustic crystal which is composed of tubes without openings,the structure proposed possesses wider acoustic band gap.So,the noise barriers,acoustic lens can be designed based on such structures.