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利用传递矩阵法,从理论上建立了全向入射条件下一维固-流周期结构中的声传播模型,在此基础上计算、分析并比较了无限周期结构的声能带结构和有限周期结构中的声传输特性.研究结果表明,当声波以一定的入射角入射时,固-流周期结构的低频通带区域存在一个声裂隙,该声裂隙所对应的入射角大小与构成周期结构的固体层和流体层的密度或结构尺寸无关,而仅取决于构成该周期性结构材料的波速.
Using the transfer matrix method, the acoustic propagation model in a one-dimensional solid-current periodic structure under the omni-directional incidence is theoretically established. Based on this, the acoustic energy band structure and the finite periodic structure of an infinite periodic structure are calculated, compared and compared The results show that when the acoustic wave is incident at a certain angle of incidence, there is a sound-induced crack in the low-frequency passband of the solid-flow periodic structure, and the angle of incidence corresponding to the acoustic crack is similar to that of the solid The layer is independent of the density or structure of the fluid layer and only depends on the wave speed of the material constituting the periodic structure.