Abstract
To overcome the negative impact of diffraction effect on the transmission wave front at the bend and to improve the transmission efficiency of acoustic wave in the bend waveguide, the finite element method by COMSOL was used to simulate the propagation characteristics of acoustic wave in the structure of bending acoustic waveguide, based on local resonance acoustic metamaterials. Specifically, the vibration mechanism of three-dimensional (3D) component locally resonant phononic crystals was presented, and the acoustic metamaterial models of M-shaped, L-shaped and S-shaped bent waveguides were constructed on the basis of the protocells. The local resonance between the acoustic wave and the protocells in the waveguide model was investigated, in order to produce the nondestructive bending propagation effect of the acoustic wave. The results of finite element analysis show that the plane acoustic waves incident from the M-shaped, L-shaped and S-shaped bending waveguide model will propagate directionally along the model structure after being controlled at the resonance frequency. These results confirm the flexibility and feasibility of the bending acoustic waveguide model designed by the local resonance acoustic metamaterials. In addition, the acoustic waveguide model in long-distance special environment was designed and the low loss transmission of acoustic signal was implemented. This study provides a new solution for engineering applications, such as ultrasonic signal detection and underwater acoustic communication transmission.
Highlights
Waveguide research is an important research topic in the field of applied physics
The waveguide structure can guide the wave to propagate along a specific direction, so it can improve the energy transmission efficiency of the wave
In some practical engineering applications, such as underwater acoustic communication, underwater acoustic signal detection and acoustic signal transmission in biological tissues, the propagation path often requires the design of multiple bending points. This kind of acoustic metamaterial structure undoubtedly provides a new idea for low loss long-distance transmission of acoustic signal in such complicated and special environment
Summary
Waveguide research is an important research topic in the field of applied physics. It mainly uses special structure design and parameter control to make electromagnetic wave or acoustic wave propagate in a specific direction at low loss. Their proposal only requires mechanical control on milli-scale, which may open the way for the design of simple sound devices with super-directivity; After that, in 2015, they[5] demonstrated an ultraslow-fluid-like particle with intense artificial Mie resonances for low-frequency airborne sound They explain the physical effects of these artificial Mie resonances by the point of view of an effective medium; In 2018, Zhang et al.[6] demonstrated theoretically and experimentally that a Mie-resonance based antenna can be designed in various modes to effectively enhance the emissivity of the radiated power and directivity of radiation pattern. A low loss acoustic waveguide with various propagation paths was implemented by using the coupling and resonance mechanism between the acoustic wave and the medium in the model
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