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A Digital Acoustic Metamaterial

A super-material and acoustic technology, applied in the direction of sound-generating devices, instruments, etc., to achieve the effect of arbitrary manipulation and simplification of complex structures

Active Publication Date: 2021-03-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a digital acoustic metamaterial, which only uses two different arrangements of elements in a rectangular array, so as to realize arbitrary manipulation of the sound field and greatly simplify the existing The complex structural problems faced by traditional acoustic metamaterials

Method used

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  • A Digital Acoustic Metamaterial
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  • A Digital Acoustic Metamaterial

Examples

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Embodiment 1

[0022] The frequency of the incident sound wave is 1000Hz, by following the image 3 Arrange the required equivalent units according to the phase distribution shown in , each equivalent unit is composed of 5X5 thin slots or rigid boundary units, the size of each smallest unit is 7mm×7mm, and the size of each equivalent unit It is 35mm×35mm, and the arrangement is as follows Figure 4 The Roman numeral sequence shown arranges the 18 equivalent units, where 1 represents the first slotted unit and 2 represents the second slotted unit. Figure 5 A graph of the numerical simulation results. If the equivalent phase in the equivalent unit is between π and 0, use the first fine groove unit, if the equivalent phase is between 0 and -π, use the second fine groove unit, the first fine groove unit or the second fine groove Units are arranged upwards and leftwards first. The equivalent unit selected in this paper is 5X5, and the size of each square is 7mm×7mm. The phase distribution we ...

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Abstract

The invention discloses a digital acoustic meta-material which is formed by splicing a plurality of equivalent units together. Each equivalent unit is composed of n*n grids, wherein n is a positive integer. Each grid is provided with a rigid boundary unit and a first fine groove unit or a second fine groove unit. Each equivalent unit only contains a first fine groove unit or a second fine groove unit. The depth h1 of each first fine groove unit is phi(1)*lambda / 4*pi, the cross-sectional area of the groove of each first fine groove unit is S, the depth h2 of each second fine groove unit is phi(2)*lambda / 4*pi, and the cross-sectional area of the groove of each second fine groove unit is S, wherein phi(1)=pi, phi(2)=-pi, and lambda is the wavelength of incident acoustic wave. According to the digital acoustic meta-material of the invention, through different arrangement of two elements in a rectangular array, arbitrary control on a sound field can be controlled arbitrarily, and the complex structure of the existing traditional acoustic meta-material can be simplified greatly.

Description

technical field [0001] The invention relates to digital acoustic supernormal materials and belongs to the field of acoustic materials. Background technique [0002] Acoustic metamaterials have properties that traditional acoustic materials do not have, and can manipulate sound waves arbitrarily. Acoustic metamaterials are widely used in various fields such as acoustic particle suspension or migration, acoustic display equipment, medical ultrasonic detection and ultrasonic surgery. At present, the traditional acoustic metamaterials are usually simulated acoustic metamaterials, and the continuous adjustment of parameters is realized by changing the complex structure. Traditional acoustic metamaterials are complex in structure, expensive to manufacture and maintain, and cannot be reused. One device can only be used in one occasion, which is not conducive to application. Contents of the invention [0003] Purpose of the invention: In order to overcome the deficiencies in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/18
CPCG10K11/18
Inventor 梁彬范旭东朱一凡杨京程建春
Owner NANJING UNIV
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