Acoustic focusing inner cavity machining research method based on temperature gradient

A technology of inner cavity processing and temperature gradient, which is applied in ultrasonic/sonic/infrasonic transmission systems, transmission systems, electrical components, etc., and can solve the problems of narrow operating frequency band and mismatch of acoustic impedance

Pending Publication Date: 2021-04-09
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acoustic focusing performance of the metasurface depends on the discontinuous distribution of different unit structures, and the metasurface unit is composed of at least two kinds of media, which can easily cause acoustic impedance mismatch and narrow operating frequency band.

Method used

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  • Acoustic focusing inner cavity machining research method based on temperature gradient
  • Acoustic focusing inner cavity machining research method based on temperature gradient
  • Acoustic focusing inner cavity machining research method based on temperature gradient

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A research method based on temperature gradient acoustic focusing inner cavity processing provided by the present invention comprises the following steps:

[0033] Step 1. Based on the relationship between air sound velocity and temperature, design a new type of thermoacoustic combined metasurface phase control unit; control the sound wave velocity by changing the air temperature of the unit, and realize the sound wave transmission and reflection phase delay covering the 2π interval;

[0034] Step 2, model establishment and boundary condition setting; the model design is a rectangular area with a length of 100cm and a width of 80cm, the focal length is set to 30cm, the initial plane wave frequency is set to 40KHz, and the length of the metasurface in the transmission unit is 1cm; among them, the medium in the transmission unit is Air; the length of the metasurface is designed to be 1cm, and the available plane wave wavelength is about 8cm; it meets the size design requir...

Embodiment 2

[0041] In this example, figure 2 Schematic diagram of the propagation model of a plane wave in a single transmission unit in the embodiment of the present invention, according to figure 2 The schematic diagram of the transmission acoustic wave focusing principle is shown to set appropriate boundary conditions and parameters. Then, according to the set parameters and boundary conditions, the influence of different sound velocities on the sound pressure distribution at the same frequency is obtained in the simulation software COMSOL, and the transmission elements are further combined to form an array to obtain the focusing effect of the transmitted sound wave.

[0042] The patent of the present invention utilizes discrete temperature combined with the idea of ​​metasurface design, and through temperature regulation, the broadband focusing effect of sound waves can be realized.

[0043] Other content of this embodiment can refer to Embodiment 1.

Embodiment 3

[0045] In this example, image 3 Schematic diagram of the principle of temperature-controlled acoustic wave focusing in the embodiment of the present invention, Figure 4 Schematic diagram of the longitudinal array distribution of the metasurface in the embodiment of the present invention; based on the propagation law and image 3 The schematic diagram of the principle of temperature-controlled sound wave focusing is shown in the rectangular area with a length of 100 cm and a width of 80 cm. Figure 4 The schematic diagram of the longitudinal array distribution of metasurface 1 is shown, and the focal length is designed to be 30cm; from figure 2 It can be seen that the two linear metasurfaces and the boundary form a rectangular transmission unit. Different constant temperatures are set in the transmission unit. The medium in the transmission unit is air. The sound velocity and air density are changed by temperature, thereby changing the acoustic impedance in the transmission...

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Abstract

The invention relates to a research method based on temperature gradient acoustic focusing inner cavity processing. The method comprises the following steps: 1, designing a novel thermo-acoustic combined super-structure surface phase control unit based on the relation between the air sound velocity and the temperature; the sound wave velocity is controlled by changing the air temperature of the unit, and the sound wave transmission and reflection phase delay covers a 2pi interval; 2, establishing a model and setting boundary conditions; 3, on the basis of establishing the model in the step 2, designing a rectangular longitudinal upper shape array with the width of 80cm; 4, designing different temperatures, different sound wave frequencies and different focal lengths in analog simulation software COMSOL, thereby obtaining phase changes corresponding to different temperatures. According to the technical scheme, the novel thermo-acoustic combined meta-structure surface phase control unit designed by the invention is simple in structure, and is convenient for analog simulation to obtain an optimal solution of an acoustic focusing effect; and the processing technology is green and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of micro-nano processing and manufacturing, and in particular relates to a research method for inner cavity processing based on temperature gradient acoustic focus. Background technique [0002] With the rapid development of phononic crystals and acoustic supermaterials, a variety of different types of acoustic focusing lenses have been realized by using the negative refraction mechanism of the two structures; the acoustic focusing effect has great significance in the fields of acoustic imaging, ultrasonic medical treatment and non-destructive testing. Wide application prospects. By gradually changing the lattice size, Young's modulus, cell shape and grid constant of the phononic crystal, a gradient distribution of the acoustic refractive index can be obtained, and a variety of gradient acoustic focusing lenses can be designed. However, the existing acoustic focusing lenses have a narrow frequency band, eve...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/20H04B11/00G06F119/08
CPCG06F30/20G06F30/17H04B11/00G06F2119/08
Inventor 吴立群范亚飞王雅静杨文哲张一凡
Owner HANGZHOU DIANZI UNIV
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