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Sound energy capturing system based on photonic crystal defect

A technology of phononic crystals and defects, which is applied in the field of acoustic energy capture systems, can solve the problem of less acoustic energy, and achieve the effects of simple manufacturing process, low preparation technical requirements, and strong designability

Inactive Publication Date: 2015-07-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are few methods for introducing defects to capture acoustic energy in phononic crystals

Method used

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  • Sound energy capturing system based on photonic crystal defect
  • Sound energy capturing system based on photonic crystal defect
  • Sound energy capturing system based on photonic crystal defect

Examples

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Embodiment

[0024] Implementation example: what this embodiment selects is water (its elastic parameter is: density ρ=1.0×10 3 Kg / m 3 , longitudinal wave velocity C l =1.48×10 3 m / s) in mercury (its elastic parameter is: density ρ=13.5×10 3 Kg / m 3 , longitudinal wave velocity C l =1.45×10 3 m / s) in the background of a 2D phononic crystal constructed with the optimal structure as described above. At this time, the energy band structure of the phononic crystal is as follows: figure 1 shown. figure 2 It is a cross-sectional schematic diagram of the structure of this embodiment, which is composed of two five-layer structural units, wherein the radius of the water column of the structure is 0.31a, and the radius of the central defective air column is respectively taken as r d =1.0r 0 、r d =0.7r 0 、r d =0.5r 0 、r d =0.3r 0 、r d =0, the lattice constant of the side length of the small square is a (a is 1-10cm). image 3 , 4 Respectively, the frequency of the defect band varies...

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Abstract

The invention discloses a sound energy capturing system based on a photonic crystal defect. The system is composed of a plurality of two-dimensional crystal lattice units in a periodic arrangement mode, and each two-dimensional lattice unit is formed by the fact that water cylinders parallel to one another and a central defect air cylinder are arrayed in mercury according to a two-dimensional crystal lattice. The radius r0 of each water cylinder is equal to 0.31a, the radius rd of the defect air cylinder is equal to 1.0r0 or 0.7r0 or 0.5r0 or 0.3r0 or 0, wherein a is a crystal lattice constant, and r0 and rd are respectively the radius of the water cylinder and the radius of each defect air cylinder. The water cylinder of the two-dimensional crystal lattice unit has at least five layers, and the crystal lattice constant a is 1-10cm. According to the sound energy capturing system based on the photonic crystal defect, different defect modes can be produced through changing of size of the radius of each defect air cylinder, and sound energy in different frequency ranges is captured. Requirements to a preparative technique are relatively low, a manufacturing process is simple, and designability is strong.

Description

technical field [0001] The invention relates to an acoustic energy capture system based on phonon crystal defects. Background technique [0002] Phononic crystals are proposed analogously to the concept of photonic crystals. By analogy with photonic crystals, it is found that when elastic waves propagate in periodic elastic composite media, similar elastic wave band gaps are produced, thus the concept of phononic crystals is proposed. An important feature of phononic crystals is the phononic band gap, and sound waves falling within the frequency range of the forbidden band will not be able to propagate through the phononic crystal. If a defect is introduced into the phononic crystal, a defect state may be introduced in the forbidden band, and the sound wave whose frequency matches the frequency of the defect state may be localized at the defect, so the sound energy can be captured at this defect. [0003] At present, there are few methods for introducing defects to trap ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/165
Inventor 张欣宁留洋吴福根姚源卫胡爱珍
Owner GUANGDONG UNIV OF TECH
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