薄膜超构表面声扩散体扩散性能研究

Diffusion properties of membrane-type metastructure acoustic diffuser

针对传统的声扩散体结构复杂、加工不便的缺点,该文提出了一种薄膜型声学超材料扩散体,通过有限元软件建立了扩散体的有限元模型。分析了薄膜张力、质量块大小及背腔深度对声波相位调控的影响,并与传统施罗德扩散体的扩散性能进行比较,发现调控后的薄膜超构表面声扩散体对声能的吸收降低,并使入射声能更均匀地向全方向扩散。在相同的尺寸情况下,与传统施罗德扩散体相比,薄膜超构表面声扩散体在所需频段内扩散性能更优,结构更优,体积更小,质量更轻,加工更方便,更适用于工程应用。

Aiming at the shortcomings of traditional acoustic diffuser structure and inconvenient processing,a film-type acoustic metamaterial diffuser has been proposed.The finite element model of the diffuser is established by finite element software.The effects of film tension,mass size,and back cavity depth on the phase regulation of sound waves were analyzed,and compared with the diffusion properties of traditional Schroder diffusers,the decrease of the absorption of sound energy by the superficial surface acoustic diffusers was observed.The incident acoustic energy is more uniformly propagated in all directions.Compared with the traditional Schroder diffuser,the film superstructure surface acoustic diffuser has better diffusion performance,better structure,smaller volume,lighter weight and more convenient processing.