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Density-adjustable multilayer periodic structure

A periodic structure and density technology, applied in the direction of layered products, rubber layered products, synthetic resin layered products, etc., can solve the problems of elastic wave inability to propagate, shape wave attenuation, etc., to achieve standardized production, convenient production, and targeted strong effect

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

When the wavelength of the elastic wave is comparable to the period size of the structure, the forward wave and the backward wave destructively interfere, and this destructive interference can attenuate the shaped wave to a large extent, so that the elastic wave of certain frequencies unable to spread

Method used

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  • Density-adjustable multilayer periodic structure
  • Density-adjustable multilayer periodic structure
  • Density-adjustable multilayer periodic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 , 2 , 3, and 7, this embodiment is a multilayer periodic structure with adjustable density. The hard small blocks are made of small spheres, which are embedded in the upper and lower outer films or plate substrates. The local parts are evenly arranged in a circle, and the overall arrangement is a circular area such as m rows and n columns. The unit cells are arranged in squares. , the lattice constant is set to a 1 . A film or plate without block is arranged in the middle layer as a substrate, and multi-layer films or plate substrates are connected together by pasting to form a multi-layer periodic structure with adjustable density.

Embodiment 2

[0032] Such as figure 1 , 4 As shown, this embodiment is a multilayer periodic structure with adjustable density. The hard small block adopts a small cuboid, which is embedded in the upper and lower outer films or plate substrates. The parts are evenly arranged in a square, and the overall arrangement is a square area such as m rows and n columns. The unit cells are arranged in squares. The lattice constant is set to a 1 . A film or plate without block is arranged in the middle layer as a substrate, and multi-layer films or plate substrates are connected together by pasting to form a multi-layer periodic structure with adjustable density.

Embodiment 3

[0034] Such as figure 1 , 5 As shown, this embodiment is a multilayer periodic structure with adjustable density. The upper hard small block adopts small spheres, which are partially arranged in a circle, and a circular area such as m rows and n columns is arranged as a whole. The unit cells are arranged in squares, and the lattice constant is set to a 1 , embedded on the upper film or plate substrate; the lower hard small block is a small cuboid, which is arranged in a square partly, and a square area such as m rows and n columns is arranged as a whole, and the unit cells are arranged in squares. The lattice constant is set to a 2 , embedded in the film or plate substrate on the underside. A film or plate without block is arranged in the middle layer as a substrate, and multi-layer films or plate substrates are connected together by pasting to form a multi-layer periodic structure with adjustable density.

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Abstract

The invention relates to a density-adjustable multilayer periodic structure. The periodic structure comprises a central thin film or a central plate base body layer (1), embedded block bodies (2) andouter side thin films or outer side plate base body layers (3), wherein the central thin film or the central plate base body layer (1) is positioned in the middle layer, the outer side thin films or the outer side plate base body layers (3) are arranged on the two sides of the central thin film or the central plate base body layer (1), the embedded block bodies (2) which are overally arranged in aperiodical mode are uniformly arranged in the outer side thin films or the outer side plate base body layers (3), so that the multilayer periodic structure is formed through stacking based on the above mode. The multilayer periodic structure is fixed on a frame with a large rigidity to be subjected to pre-stretching, the density of the periodic structure can be adjusted, so that the physical parameters of the periodic structure are changed, and the active control over periodic structure band gaps is realized; and the structure can be applied to the field of vibration reduction and vibration isolation, compared with a traditional active and passive vibration isolation structure, the periodic structure has the advantages of light weight, wide vibration isolation frequency, high reliabilityand the like, and meanwhile, the structure can be used for actively controlling the band gap range.

Description

technical field [0001] The invention relates to a periodic structure, in particular to a multilayer periodic structure with adjustable density. Background technique [0002] Periodic structures are also called phononic crystals. There are two main mechanisms for the formation of band gaps in phononic crystals, namely the Bragg scattering mechanism and the local resonance mechanism. Phononic crystals based on these two mechanisms are also called Bragg scattering phononic crystals and local resonance phononic crystals, respectively. When the elastic wave propagates in the periodic structure, the elastic wave will be scattered on the periodic interface. When the wavelength of the elastic wave is comparable to the period size of the structure, the forward wave and the backward wave destructively interfere, and this destructive interference can attenuate the shaped wave to a large extent, so that the elastic wave of certain frequencies Unable to propagate. This bandgap mechani...

Claims

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Application Information

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IPC IPC(8): F16F7/00G10K11/165G10K11/168B32B27/38B32B3/08B32B27/08B32B27/06B32B25/04B32B25/08B32B7/12B32B33/00
CPCF16F7/00G10K11/165G10K11/168B32B27/38B32B3/08B32B27/08B32B27/06B32B25/042B32B25/08B32B7/12F16F2224/02F16F2230/40
Inventor 万水周鹏王潇年玉泽李夏元宋爱明苏强朱营博徐皓甜
Owner SOUTHEAST UNIV
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