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Three-dimensional gradient periodic structure plate with multiple band gap characteristics

A periodic structure, three-dimensional technology, applied in the direction of sound-generating devices, instruments, etc., to achieve the effect of facilitating standardized production, convenient production, and strong pertinence

Pending Publication Date: 2019-10-15
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main disadvantage of local resonance phononic crystals is that the operating frequency can only be located in a narrow range

Method used

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  • Three-dimensional gradient periodic structure plate with multiple band gap characteristics
  • Three-dimensional gradient periodic structure plate with multiple band gap characteristics
  • Three-dimensional gradient periodic structure plate with multiple band gap characteristics

Examples

Experimental program
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Effect test

Embodiment 1

[0035] like Figure 1a , 2 , 3, this embodiment is a three-dimensional gradient periodic structure plate with multiple bandgap characteristics. The unit cells are arranged in a square, and the lattice constant is set to a 1 , m rows and n columns of cylindrical stubs are set up on each layer, and the stubs on the same layer have the same material, size and arrangement. Set the three-dimensional periodic structural plate on the h floor, and the height of the short column from the bottom layer to the top floor is from h 1 Change to h according to a certain function rule 2 . The multi-layer periodic structural plates are connected together by welding or pasting to form a three-dimensional gradient periodic structural plate.

Embodiment 2

[0037] like Figure 1b , 2 , 3, this embodiment is a three-dimensional gradient periodic structure plate with multiple bandgap characteristics. The unit cells are arranged in a square, and the lattice constant is set to a 1 , m rows and n columns of cylindrical stubs are set up on each layer, and the stubs on the same layer have the same material, size and arrangement. Set the three-dimensional periodic structural plate of the h layer, and the radius of the short column from the bottom layer to the top layer is r 1 Change to r according to a certain function rule 2 . The multi-layer periodic structural plates are connected together by welding or pasting to form a three-dimensional gradient periodic structural plate.

Embodiment 3

[0039] like Figure 1c , 2 , 3, this embodiment is a three-dimensional gradient periodic structure plate with multiple bandgap characteristics. The unit cells are arranged in a square, and the lattice constant is set to a 1, m rows and n columns of cylindrical stubs are set up on each layer, and the stubs on the same layer have the same material, size and arrangement. Set the three-dimensional periodic structural plate of the h layer, and the radius of the short column from the bottom layer to the top layer is r 1 Change to r according to a certain function rule 2 , height from h 1 Change to h according to a certain function rule 2 . The multi-layer periodic structural plates are connected together by welding or pasting to form a three-dimensional gradient periodic structural plate.

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Abstract

The invention relates to a three-dimensional gradient periodic structure plate with multiple band gap characteristics. The three-dimensional gradient periodic structure plate comprises a multi-layer solid plate base body, and m rows and n columns of short scatterer columns which are arranged to be raised in each layer of plate according to periodicity or quasi-periodicity. Therefore, a plurality of groups of periodic structure plates with short columns are stacked to form the three-dimensional periodic structure plate. The radius or the side length of the raised short columns on the same layerof the plates can be unchanged or can be gradually changed in the row or column direction according to a certain function rule. In the height direction, the height, radius or side length of each layer of raised short columns is gradually reduced or increased according to a certain function rule to form the three-dimensional gradient periodic structure plate. Each layer of the periodic structure plate has a respective band gap characteristic. That means, elastic waves or sound waves in certain frequencies are significantly suppressed when propagating in the plate. The periodic structure can realize the integrated design of the structure and the vibration isolation system. The structure plate has the advantages of light weight, wide vibration isolation frequency, high reliability and the like. The structure plate has a wide application prospect in the field of engineering vibration isolation.

Description

technical field [0001] The invention relates to a periodic structure, in particular to a three-dimensional gradient periodic structure plate with multiple band gap characteristics. Background technique [0002] The periodic structure plate is a kind of phononic crystal with limited space. The concept of phononic crystal is deduced from the concept of photonic crystal. Both of them simulate the arrangement of natural crystal atoms and have a certain periodic structure. A composite material or structure that is formed by two or more media with different elastic properties nested periodically in space and has an elastic wave band gap is called a phononic crystal. The existence of elastic wave band gap is the most important characteristic of phononic crystals. There are two main physical mechanisms for producing elastic wave band gap: Bragg scattering mechanism and local resonance mechanism. The formation of these two band gaps is due to the combined effect of structural period...

Claims

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Application Information

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IPC IPC(8): G10K11/162G10K11/172
CPCG10K11/162G10K11/172
Inventor 万水周鹏年玉泽王潇李夏元宋爱明苏强朱营博徐皓甜
Owner SOUTHEAST UNIV
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