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Phononic crystal with adjustable band gap based on shape memory alloy and adjusting method

A technology of memory alloys and phononic crystals, which is applied in the direction of sound-generating devices and instruments, can solve the problems of cumbersome and single adjustment methods, narrow adjustment bandgap range, and the inability to adjust the bandgap of phononic crystals, and achieve simple adjustment methods and high adjustment performance. The effect of bandwidth

Pending Publication Date: 2021-07-09
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a phononic crystal structure and adjustment method based on a shape memory alloy adjustable bandgap, which overcomes the shortcomings of the existing phononic crystals that the bandgap cannot be adjusted, the bandgap adjustment range is narrow, and the adjustment method is cumbersome and single.

Method used

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  • Phononic crystal with adjustable band gap based on shape memory alloy and adjusting method
  • Phononic crystal with adjustable band gap based on shape memory alloy and adjusting method
  • Phononic crystal with adjustable band gap based on shape memory alloy and adjusting method

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Embodiment 1

[0033] A phononic crystal with an adjustable bandgap based on a shape memory alloy, including a scatterer 1 made of a solid rounded rectangular two-way shape memory alloy built in a square lattice, a fluid matrix, a positioning device 2, a central positioning column 3, and a stepper Motor 4, heating device. The filling rate of the scatterers is above 56%. The phononic crystal structure is a two-dimensional fluid / solid phononic crystal with multiple scatterers arranged in a square lattice, and the number and arrangement of scatterers are designed in advance according to needs.

[0034] refer to figure 1 Schematic diagram of a three-dimensional structure, a phononic crystal based on a shape memory alloy with adjustable bandgap, including a scatterer 1, a positioning device 2, a central positioning column 3, a stepping motor 4, and a fluid matrix.

[0035] refer to figure 2 Schematic diagram of the arrangement of periodic units in a two-dimensional phononic crystal, a phononi...

Embodiment 2

[0043] A method for adjusting a phononic crystal with an adjustable bandgap based on a shape memory alloy. The phononic crystal drives a scatterer 1 to rotate through a stepping motor 4 and / or adjusts the bandgap of the phononic crystal by changing the temperature of the scatterer 1 .

[0044] The stepping motor 4 drives the scatterer 1 to rotate in the following way: the stepping motor 4 drives the scatterer 1 alloy to rotate, so that the scatterer 1 rotates to a required angle, so that the energy band structure of the phononic crystal is changed, and the phononic crystal is realized. Adjustment of the bandgap. The preset angle is determined by specific point defects and line defects.

[0045] The method of changing the temperature of the scatterer 1 is: heating the scatterer 1 by a heating device, when the temperature of the scatterer 1 reaches A s (the temperature at which the austenite transformation begins), the scatterer 1 starts the austenite phase transformation, when...

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Abstract

A photonic crystal with an adjustable band gap based on shape memory alloy comprises a scatterer, a positioning device, a center positioning column and a stepping motor, the scatterer is made of the shape memory alloy, the periphery of the scatterer is filled with a fluid matrix, the scatterer is in a cuboid shape, and the corners of the cuboid are round corners; and the center positioning column is arranged at one end of the scatterer, a positioning hole is formed in the center of the positioning device, and the center positioning column penetrates through the positioning hole to be connected with the stepping motor. The scatterer is driven by the stepping motor to rotate, and / or the temperature of the scatterer is changed through a heating device to adjust the band gap of the photonic crystal. The adjusting method has the characteristics of energy bandwidth adjustment and simple adjustment mode, can be used for designing point defects and line defects in the photonic crystal, and can add forbidden bands and guided wave channels for the photonic crystal structure, the dynamic defect state setting has important significance on the design of electronic elements such as frequency-adjustable acoustic filters, acoustic resonators, and the like, and therefore, the purpose of dynamically controlling sound wave propagation is achieved.

Description

technical field [0001] The invention relates to the field of phononic crystals, in particular to a phononic crystal with an adjustable bandgap based on a shape memory alloy and an adjustment method. Background technique [0002] The biggest feature of phononic crystals as an artificial periodic structure is its designability. For the design of phononic crystals, the corresponding composition materials and structural parameters are generally selected after calculation. Usually, for phononic crystals whose components are common materials, once they are manufactured, the position and width of the vibrational bandgap are uniquely determined due to the determined material and structural parameters. When the frequency range of the vibration source changes, the band gap of the phononic crystal cannot adapt to this change. If the size and range of the band gap can be artificially changed according to the needs during use, it will make the band gap design of the phononic crystal mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/26
CPCG10K11/26
Inventor 纪华伟杨帆戚安琪吕博穆东方饶忠于
Owner HANGZHOU DIANZI UNIV
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