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A cluster of supercells capable of forming line defect periodic composite structure

A composite structure, supercell technology, applied in the field of supercells

Pending Publication Date: 2020-10-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This characteristic of phononic crystal just makes up for the defects of traditional vibration suppression methods such as passive control and active control, and it is a good way and method to solve noise and vibration

Method used

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  • A cluster of supercells capable of forming line defect periodic composite structure
  • A cluster of supercells capable of forming line defect periodic composite structure
  • A cluster of supercells capable of forming line defect periodic composite structure

Examples

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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, this embodiment is a cluster of supercells in which scatterer oscillators are embedded in a substrate, and there are 8 types of A-H in total. The lattice constant of each supercell is a. The scatterer oscillators are distributed quasi-periodically on the base plate, and the ordinary scatterer oscillators are two-element cuboids, and the side lengths of the top squares of the inner and outer layers are respectively d 1 and d 2 , the defect scatterer is a monolithic cylinder with a diameter of D 2 . Paste connections are used between the outer layer of the vibrator and the substrate, and between the inner layer of the vibrator and the outer layer of the vibrator.

Embodiment 2

[0036] Such as figure 2 As shown, the present embodiment is a cluster of supercells in which scatterer oscillators are convexly arranged on the substrate, and there are 8 types of A-H in total. The lattice constant of each supercell is a. The scatterer oscillators are distributed quasi-periodically on the substrate plate, and the ordinary scatterer oscillators are two-component cylinders, and the heights of the inner and outer layers are h 1 and h 2 , the diameter is D 0 , defect scatterers do not exist. The height of the base is e. Paste connections are used between the inner layer of the vibrator and the substrate, and between the inner layer vibrator and the outer layer vibrator.

Embodiment 3

[0038] Such as image 3 As shown, this embodiment is a periodic composite structure with linear defects formed by combining 6 C-type supercells and 3 B-type supercells in 3×3. The lattice constant of the supercell is a, the scatterer oscillator is in the shape of a monolithic cylinder, and the diameters of ordinary scatterers and defect scatterers are D 1 and D 2 , embedding the distribution on the matrix. The vibrator and the base board are connected by pasting.

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Abstract

The invention relates to a cluster of supercells capable of forming a line defect periodic composite structure. The cluster of supercells comprises eight types of A-H. Each kind of supercell element comprises a substrate (1) and scatterer oscillators (2) arranged on the substrate (1) according to a quasi-periodic arrangement; through mutual combination of the supercell elements, a periodic composite structure with a line defect characteristic can be formed. The periodic composite structure has a band gap characteristic, and vibration in a specific frequency range cannot be propagated through the structure. The introduction of the defect structure changes the original energy band structure of the periodic composite structure, so that the elastic wave with the frequency corresponding to thedefect state can only be propagated along the line defect. Therefore, the periodic composite structure with the line defect characteristic provides an effective way for controlling elastic waves by utilizing an artificial structure, and has important value in the fields of engineering vibration isolation, waveguides, sound wave filters and the like.

Description

technical field [0001] The invention relates to a cluster of supercells, in particular to a cluster of supercells capable of forming a line defect periodic composite structure. Background technique [0002] With the rapid development of economy and society, vibration and noise problems in transportation, machinery operation, human life and entertainment, construction and other aspects have attracted more and more attention. Classified according to whether energy needs to be used, traditional vibration suppression methods mainly include passive control and active control. [0003] In the 1990s, scientists discovered that the propagation of acoustic elastic waves on elastic materials with periodic structures would result in the inability of elastic waves to propagate within a certain frequency range, so the concept of phononic crystals (periodic composite structures) was proposed. Phononic crystals are structures in which unit cells are periodically arranged as the basic unit...

Claims

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Application Information

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IPC IPC(8): G10K11/00G10K11/16
CPCG10K11/002G10K11/16
Inventor 万水周鹏王潇符俊冬年玉泽李夏元程红光
Owner SOUTHEAST UNIV
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