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Projected periodic structure plate with gradient refractive index

A technology of gradient refractive index and periodic structure, which is applied in the direction of sound-emitting devices and instruments, can solve problems such as complex structures, and achieve the effects of convenient production, lower cost, and smaller scale

Pending Publication Date: 2019-07-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large number of crystal lattices in the structure, it will be very complicated to design the structure by changing the material or the shape of the scatterer

Method used

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  • Projected periodic structure plate with gradient refractive index
  • Projected periodic structure plate with gradient refractive index
  • Projected periodic structure plate with gradient refractive index

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Experimental program
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Embodiment 1

[0032] Such as Figure 1a , figure 2 , image 3 As shown, this embodiment is a convex periodic structural plate in which the thickness of the inner layer of the vibrator is constant and the thickness of the outer layer changes linearly. A square lattice is used, and the lattice constant is set to a 1 , the protrusions set m rows and n columns of cylindrical vibrators, the size of the vibrators in the same row remains unchanged, and in the column direction, the thickness of the inner layer of each row of vibrators is t 0 , the outer layer thickness from t 1 Change according to a certain function rule to t 2 change to t 1 . The material of the base plate is concrete, the inner material of the vibrator is silicon rubber, and the outer material is steel.

Embodiment 2

[0034] Such as Figure 1b , figure 2 , image 3 As shown, this embodiment is a convex periodic structural plate in which the thickness of the outer layer of the vibrator is constant and the thickness of the inner layer changes linearly. A square lattice is used, and the lattice constant is set to a 2 , the protrusions are set with m rows and n columns of cylindrical vibrators, the size of the vibrators in the same row is constant, and in the column direction, the thickness of the outer layer of each row of vibrators is t 0 , inner layer thickness from t 1 Change according to a certain function rule to t 2 change to t 1 . The material of the base plate is concrete, the inner material of the vibrator is silicon rubber, and the outer material is steel.

Embodiment 3

[0036] Such as figure 2 , image 3 , Figure 4 As shown, this embodiment is a convex periodic structure plate in which the vibrator is arranged in an equilateral triangular lattice. The thickness of the inner layer of the vibrator remains constant, and the thickness of the outer layer gradually changes linearly. An equilateral triangular lattice is adopted, and the lattice constant is set to a 3 , the protrusions set m rows and n columns of cylindrical vibrators, the size of the vibrators in the same row remains unchanged, and in the column direction, the thickness of the inner layer of each row of vibrators is t 0 , the outer layer thickness from t 1 Change according to a certain function rule to t 2 change to t 1 . The material of the base plate is concrete, the inner material of the vibrator is silicon rubber, and the outer material is steel.

[0037] Such as Figure 5a , 5b As shown, when an acoustic or elastic wave of a specific frequency is injected into a gradi...

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Abstract

The invention relates to a projected periodic structure plate with the gradient refractive index. The periodic structure plate comprises a base body plate (1) and m rows and n lines of scattering bodyvibrators convexly arranged on the base body plate (1) according to periodic arrangement, wherein the base body plate (1) and the scattering body vibrators jointly form an acoustic or elastic wave passing material with the negative refractive characteristics; the same scattering body vibrator is formed by an inner layer and an outer layer of materials including a vibrator inner layer (2) and a vibrator outer layer (3) through stacking; the negative refraction can be realized on emitted elastic waves or sound waves with the specific frequency; the gradual change of the refractive index is realized in the plate along the wave spreading direction by gradually changing the geometrical parameters of the vibrators, so that the elastic waves or sound waves with the specific frequency emitted into the structure from any direction can gradually bend; therefore the goal of controlling the wave spreading direction is achieved; the interference phenomenon exists between the emitting waves; the important value is realized in the fields of sound wave filters and the like.

Description

technical field [0001] The invention relates to a periodic structure, in particular to a convex periodic structure plate with gradient refractive index. Background technique [0002] Periodic structures, also known as phononic crystals, refer to periodic materials or structures with acoustic or elastic band gaps, and their internal elastic constants and densities vary periodically. As far as its material composition is concerned, phononic crystals can be solid / solid, solid / fluid or fluid / fluid systems, or a single material system formed by periodically opening holes in a certain material matrix. The interconnected background material in the phononic crystal is the matrix, and the disconnected material is the scatterer, and both the matrix and the scatterer can be solid, liquid or gas. According to the different mechanism of band gap generation, phononic crystals can be divided into Bragg scattering phononic crystals and local resonance phononic crystals. [0003] Metamater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/30G10K11/162
CPCG10K11/30G10K11/162
Inventor 万水周鹏年玉泽王潇李夏元程红光苏强朱营博徐皓甜
Owner SOUTHEAST UNIV
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