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Sub-wavelength structure capable of achieving redirected propagation of sound waves in liquid

A sub-wavelength structure and redirection technology, which is applied to ultrasonic/sonic/infrasonic directional device components, direction finders using ultrasonic/sonic/infrasonic waves, etc., can solve problems such as the inability to effectively control underwater sound waves, and promote small The effect of globalization development, significant redirection performance, and obvious effect

Inactive Publication Date: 2018-05-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the acoustic metasurface mainly redirects the propagation direction of the sound wave in the air, and it is not yet possible to effectively control the underwater sound wave in the water environment.

Method used

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  • Sub-wavelength structure capable of achieving redirected propagation of sound waves in liquid
  • Sub-wavelength structure capable of achieving redirected propagation of sound waves in liquid
  • Sub-wavelength structure capable of achieving redirected propagation of sound waves in liquid

Examples

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Embodiment 1

[0032] combined with figure 1 It is the three-dimensional schematic diagram of the sub-wavelength structure that realizes the redirected propagation of underwater acoustic waves described in the present invention. In order to simplify the calculation, the three-dimensional schematic diagram can be simplified to a two-dimensional model of the z-y plane, such as figure 2 shown.

[0033] combined with figure 2 The sub-wavelength structure shown is formed by the coupling of a one-dimensional flow / solid acoustic grating and a one-dimensional flow / solid phononic crystal, figure 2 In , the solid material 1 in the acoustic grating repeats periodically in the y direction; the solid material 2 in the phononic crystal repeats periodically in the z direction; the white background area is the fluid material. The thickness of the solid material 1 in the grating is d 1 , the width is a, the acoustic grating constant A is the length corresponding to one cycle of the acoustic grating in...

Embodiment 2

[0039] Adjusting the acoustic grating constant A can redirect the propagation direction of the incident acoustic wave in different frequency bands; adjusting the period number N of the phononic crystal can realize sub-wavelength redirecting structures with different thicknesses.

[0040] In order to illustrate the controllability of the present invention to the redirection propagation of underwater incident sound waves, Figure 5 It is given that when the grating constants are (a) A=0.0256m, (b) A=0.0213m, (c) A=0.0183m, (d) A=0.0160m, the plane wave with a frequency of 65kHz is incident at 41° The resulting acoustic field distribution when reaching a subwavelength structure. In the simulation of this example, it is assumed that the solid material 1 in the acoustic grating in the subwavelength structure is steel, and its thickness d 1 = 2mm, width a = 8mm; the solid material 2 of the phononic crystal is plexiglass, and its thickness d 2 =2mm, lattice constant D=3mm. Couplin...

Embodiment 3

[0042] In order to further illustrate the sub-wavelength characteristics of the structure thickness of the present invention, Image 6 It is given that when the period numbers of the phononic crystal are (a) N=4, (b) N=3, (c) N=2, (d) N=1, the plane wave with a frequency of 65kHz is incident on the sub- The sound field distribution produced by the wavelength structure. In the simulation of this example, the material parameters are the same as those in Example 2, except that the period number of the phononic crystal is reduced. It can be seen that when the period number of the phononic crystal decreases, the acoustic wave redirection effect hardly changes, but the overall thickness of the structure becomes more compact, and when N=1, the thickness of the structure is about λ / 10. It shows that the beam redirection control effect of the sub-wavelength structure involved in the present invention is remarkable.

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Abstract

The invention relates to a sub-wavelength structure capable of achieving redirected propagation of sound waves in liquid and relates to the field of acoustic ultrasonic materials. The sub-wavelength structure is characterized in that an acoustic ultrasonic material is built, and redirection of the propagation direction of underwater incident sound waves is achieved under a condition that the thickness of the acoustic ultrasonic material is smaller than the wavelength of the incident sound waves; the acoustic ultrasonic material is coupled by one-dimensional flow / solid diffraction acoustic grating and one-dimensional flow / solid photonic crystals; the solid materials forming the acoustic grating are stainless steel, copper, aluminum and high-impedance metal materials, and the solid materialsforming the photonic crystals are organic glass, epoxy resin, polyvinyl chloride, hard rubber and low-impedance nonmetal materials. The sub-wavelength structure is simple, easy to implement, evidentin redirection performance on underwater low-frequency incident plane sound waves, capable of helping the miniaturization development of water and sound energy flow operation devices or equipment andsignificant to fields such as underwater target detection, underwater acoustic communication and underwater information safety.

Description

technical field [0001] The invention relates to the field of acoustic metamaterials, in particular to a sub-wavelength structure that realizes the redirection and propagation of sound waves in liquids. Background technique [0002] Acoustic waves are the only energy carrier that can realize long-distance information transmission underwater. The regulation of the propagation direction of underwater acoustic waves has important academic significance and application prospects in the fields of underwater target detection, information transmission, and underwater acoustic safety. An effective way to control the direction of underwater low-frequency sound waves is to use transducer array technology to control the phase and amplitude of sound waves generated by each array element, so as to realize acoustic effects such as beam deflection and focusing of sound waves. However, the transducer array technology requires additional external circuits and complex signal processing technolo...

Claims

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Application Information

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IPC IPC(8): G01S3/801
CPCG01S3/801
Inventor 张赛许伯强陆伟何惠子
Owner JIANGSU UNIV
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