Negative refraction and guided waves in fluid-solid phononic crystals

被引：0
|
作者：
Yang S. [1 ]
Li C. [1 ]
Lai H. [1 ]
Wang Y. [2 ]
机构：
[1] School of Civil Engineering and Architecture, Anyang Normal University, Anyang
[2] School of Mechanical Engineering, Tianjin University, Tianjin
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2022年 / 43卷 / 09期
关键词：
Bandgap; coupled-resonantor; Defect states; Equifrequency contour; Fluid-solid; Negative refraction; Phononic crystals; Waveguide;
D O I：
10.11990/jheu.202205080
中图分类号：
学科分类号：
摘要：
In this paper, negative refraction and guided waves in fluid-solid phononic crystals formed by I-shaped steel arranged in air in the square lattice are studied. Numerical calculations are conducted by using the finite element method. According to the equifrequency contour, the frequency where negative refraction appears is determined and verified by simulation. Linear and bent waveguides are designed to control wave propagation by introducing linear defects. And wave propagation in coupled-resonantor waveguides are studied by introducing linear chains of defects. The results show that in phononic crystal for ϕ = 0°, the wave propagates only along the y direction at 5255Hz. The negative refraction occurs when wave propagation at 3045Hz in phononic crystal for ϕ = 45°. Only in a specific frequency range can waves propagate in a Z type linear waveguide. In different frequency ranges, waves can propagate in the two straight coupled-resonantor waveguides respectively. The results are relevant for the design of acoustic devices based on fluid-solid phononic crystals. © 2022 Editorial Board of Journal of Harbin Engineering. All rights reserved.
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页码：1370 / 1375
页数：5
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