The Analysis Of Wave Directional Propagation Performance Of Symmetry-broken Acoustic Metamaterials

Due to the exotic abilities breaking through the limits of traditional materials,acoustic metamaterials have wide potential applications in many fields,such as medicine,military and industry,and attract researchers' attention.Here,we propose three kinds of symmetry-broken acoustic metamaterials by symmetry breaking.Through full-wave numerical simulations,the wave directional propagation performances of unit cell structures of these three kinds of symmetry-broken acoustic metamaterials are analyzed.We construct three acoustic networks consisting of multiple unit cell structures to investigate their wave directional propagation performances in complex pathways.The main research work is as follows:(1)The Analysis of The Wave Directional Propagation Performance of The Two-dimensional Symmetry-broken Acoustic MetamaterialThrough symmetry-breaking,we propose a kind of two-dimensional(2D)symmetry-broken acoustic metamaterial.Based on the results of the full-wave numerical simulations,it is proved that the unit cell structure of the 2D symmetry-broken acoustic metamaterial exhibits the wave directional propagation performance between two waveguides.By adjusting the different structural parameters,the stability of wave directional propagation p erformance of the unit cell structure is studied.we construct a acoustic network consisting of multiple unit cell structures.In the acoustic network,the wave directional propagation p erformance in complex pathways is realized.(2)The Analysis of The Wave Directional Propagation Performance of The Two-dimensional Subwavelength Symmetry-broken Acoustic MetamaterialBy adding Helmholtz resonators,we design a kind of two-dimensional(2D)subwavelength symmetry-broken acoustic metamaterial.For the effect of Helmholtz resonators,the unit cell structure of the 2D subwavelength symmetry-broken acoustic metamaterial possesses the low-frequency wave directional propagation p erformance.When different structural parameters are changed,the stability of low-frequency wave directional propagation performance of the subwavelength unit cell structure is investigated.We use multiple subwavelength unit cell structures to build a subwavelength acoustic network.The low-frequency wave directional propagation performance is achieved in the complex pathways of the subwavelength acoustic network.(3)The Analysis of The Wave Directional Propagation Performance of The Three-dimensional Symmetry-broken Acoustic MetamaterialA kind of three-dimensional(3D)symmetry-broken acoustic metamaterial is designed by symmetry-breaking.Through numerical and experimenta l observations,it is proved that the unit cell structure of the 3D s ymmetry-broken acoustic metamaterial has the 3D wave directional propagation performance.Under the change of different structural parameters,the stability of 3D wave directional propaga tion performance of the 3D unit cell structure is analyzed.The 3D acoustic network is constructed based on 3D unit cell structure.In the 3D acoustic network,t he 3D wave directional propagation performance in complex pathways is realized.The numerical and experimental results show that the three kinds of symmetry-broken acoustic metamaterials all have good wave directional propagation performances.These studies provide an effective way for the design of acoustic metamaterials with wave directional propagation performance.