Abstract
To generate directional transmission characteristics of acoustic waves, we constructed two abnormal transmission models based on the protocell. The simulation results showed that the band gap characteristic of the phononic crystal structure can be used to realize the directional transmission effect. We also found that the acoustic frequency has a great influence on the acoustic transmission characteristics of artificial acoustic structures. Because the artificial acoustic structure based on phononic crystals has the advantages of design flexibility, it can be customized according to the actual engineering application. Our results provided a new direction for engineering applications such as directional transmission of acoustic waves and acoustic diodes.
Highlights
The study of artificial electromagnetic medium shows that when special electromagnetic structure units are embedded in the medium, “new materials” with extraordinary physical properties different from those of materials in nature can be obtained, which are called metamaterials
Liu et al.7 studied the equivalent parameters of three-component locally resonant phononic crystals of pure solid materials, and found that the negative equivalent mass density effect exists in the local resonant bandgap
The acoustic wave cannot pass through the acoustic structure, and can only propagate in the path without the phononic crystal structure
Summary
The study of artificial electromagnetic medium shows that when special electromagnetic structure units are embedded in the medium, “new materials” with extraordinary physical properties different from those of materials in nature can be obtained, which are called metamaterials. When the design size of the elastic structural unit is reduced to the size of deep subwavelength, the artificial periodic structure can have special physical effects such as negative mass density, negative elastic modulus and negative refraction.. When the design size of the elastic structural unit is reduced to the size of deep subwavelength, the artificial periodic structure can have special physical effects such as negative mass density, negative elastic modulus and negative refraction.3,4 Such artificial acoustic structure is called acoustic metamaterials. In 2004, Li and Chan first proposed the concept of acoustic metamaterials They studied a solid/liquid phononic crystal consisting of a soft silicone rubber scatterer embedded in water. It was found that the liquid phononic crystal has a negative equivalent mass in its local resonant bandgap, and experimental verification was given. The acoustic field localization of “defect” position is the prominent innovation of this paper, which will provide a good new idea for the directional lossless transmission of acoustic signals in underwater acoustic communication and the orbit design of liquid microfluidic control
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