声波导多模共振及其缺陷态  

Defect states of multiple mode resonances in acoustic waveguides

作　　者：钱留伟 高越 汪琳阁 樊亚仙 陶智勇 QIAN Liuwei;GAO Yue;WANG Linge;FAN Yaxian;TAO Zhiyong(College of Ocean Engineering,Guilin University of Electronic Technology,Beihai 536000,China;Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学海洋工程学院,北海536000 [2]广西无线宽带通信与信号处理重点实验室桂林电子科技大学,桂林541004

出　　处：《应用声学》2025年第2期292-298,共7页Journal of Applied Acoustics

基　　金：广西自然科学基金项目(2021GXNSFDA075006,2021GXNSFAA220086);国家自然科学基金项目(12064005);“认知无线电与信息处理”教育部重点实验室2022年主任基金项目。

摘　　要：为了研究声波导中多种模式的相互作用及缺陷态特性,该文设计了一种具有变截面的周期声波导,实现了多种模式共振导致的声学带隙。通过在波导中引入缺陷结构,进而破坏原有的共振模式,产生了声波反常透射现象,并且调整缺陷的长度还可以实现缺陷态中心频率的调控。对不同缺陷长度波导内的声场分析结果表明,沿波导中轴线的声压有对称和反对称两种分布形式,并且这种分布特性主要由声波的基模和一阶模式导致。不同于传统布拉格共振的相关研究,该文所提出的多模共振及缺陷态的实现方法为声波调控提供了不同的设计手段,更有利于功能型声波导器件的发展与应用。To investigate the interaction and defect state of multiple transverse modes in acoustic waveguides,this paper designs a waveguide with periodically corrugated boundaries,achieving acoustic bandgap caused by multiple mode resonances.By introducing defect structures in the waveguide,the original resonance mode is disrupted,and abnormal transmission of sound waves is also generated.Adjusting the length of defects can also achieve the center frequency manipulation of defect states.The analysis results of the sound field in waveguides with different defect lengths show that there are two distributions of sound pressure along the axis of the waveguide:symmetric and antisymmetric,and the distributions are mainly caused by the interaction between the fundamental and first-order modes.Different from traditional Bragg resonances,the design and implementation methods of multimode resonances and defect states proposed in this paper provide different means for acoustic modulation,which is more conducive to the development and application of functional acoustic waveguide devices.

关 键 词：周期结构 多模共振 缺陷态 对称性 

分 类 号：O424[理学—声学]