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A multi-band acoustic wave asymmetric transmission device based on metal plate composite structure

A composite structure and metal plate technology, applied in the field of acoustic metamaterials, can solve the problems of narrow asymmetric transmission frequency band, complex structure, difficult processing, etc., and achieve the effect of being conducive to popularization and application.

Inactive Publication Date: 2019-01-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies of traditional acoustic asymmetric transmission devices in the prior art, such as low forward transmittance, narrow and small number of asymmetric transmission frequency bands, large size, complex structure, and difficult processing, the present invention provides a composite structure based on metal plate The multi-band acoustic wave asymmetric transmission device, the device has high forward transmittance, acoustic wave asymmetric transmission frequency bandwidth and large number, simple structure and easy to realize

Method used

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  • A multi-band acoustic wave asymmetric transmission device based on metal plate composite structure
  • A multi-band acoustic wave asymmetric transmission device based on metal plate composite structure
  • A multi-band acoustic wave asymmetric transmission device based on metal plate composite structure

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Embodiment 1

[0035] Such as figure 1 As shown, a multi-band acoustic wave asymmetric transmission device based on a metal plate-like composite structure includes a metal plate-like composite structure and water, and the metal plate-like composite structure is immersed in water; the metal plate-like composite structure includes two parallel to each other A metal flat plate 1 and two one-dimensional periodic grid plates 2, the two metal flat plates 1 are located at the center, and the two one-dimensional periodic grid plates 2 are distributed on both sides and are symmetrical about the two metal flat plates 1, each The one-dimensional periodic grid plate 2 is provided with at least 5 grids, and the total number of grids in the one-dimensional periodic grid plate 2 can cover the corresponding metal plate 1 .

[0036] The width h=1.0mm and the distance d of the two metal flat plates 1 1 =0.4mm, distance d between the one-dimensional periodic grid plate 2 and the corresponding metal plate 1 2...

Embodiment 2

[0042] The finite element numerical method is used to establish the model of metal plate composite structure immersed in water. Now keep the material parameters of brass and water unchanged, that is, the density of brass is 8400kg / m 3 , the longitudinal wave velocity is 4400m / s and the transverse wave velocity is 2200m / s; the density of water is 998kg / m 3 And the speed of sound is 1483m / s. At the same time, other structural parameters are scaled to 2.4 times the original, that is, the parameter of the metal plate composite structure is a 1 =8.64mm, a 2 =5.76mm, d 1 = d 2 =0.96mm, b=7.2mm, c=1.92mm, h=2.4mm.

[0043] from image 3 It can be seen from the figure that there are also four asymmetric transmission frequency bands in the frequency range of 150kHz-700kHz (from left to right are frequency band I, frequency band II, frequency band III and frequency band IV), and the frequency of asymmetric transmission of sound waves can be as low as 200kHz; In frequency band I, ...

Embodiment 3

[0045] The finite element numerical method is used to establish the model of metal plate composite structure immersed in water. Now keep the material parameters of brass and water unchanged, that is, the density of brass is 8400kg / m 3 , the longitudinal wave velocity is 4400m / s and the transverse wave velocity is 2200m / s; the density of water is 998kg / m 3 And the speed of sound is 1483m / s. At the same time, the parameters of other structures are scaled to 0.6 times of the original, and the parameters of the metal plate composite structure are a 1 =2.16mm, a 2 = 1.44mm, d 1 = d 2 =0.24mm, b=1.8mm, c=0.48mm, h=0.6mm.

[0046] from Figure 4 It can be seen that there are also four asymmetric transmission frequency bands in the frequency range of 500kHz-2400kHz (from left to right, frequency band I, frequency band II, frequency band III and frequency band IV), and the asymmetric transmission frequency of sound waves can be as high as 2400kHz; in the frequency band In I, the...

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Abstract

The present invention provides a multiband sound wave asymmetric transmission device based on a metal plate-shaped composite structure. The multiband sound wave asymmetric transmission device based on the metal plate-shaped composite structure comprises the metal plate-shaped composite structure and water, and the metal plate-shaped composite structure is immersed in the water, and comprises two parallelly arranged metal flat plates and two one-dimensional periodicity grid plates. The two metal flat plates are located in the center, the two one-dimensional periodicity grid plates are located at the two sides respectively, and each one-dimensional periodicity grid plate is equipped with at least 5 grids. The multiband sound wave asymmetric transmission device based on the metal plate-shaped composite structure of the present invention realizes the asymmetric transmission of a multiband sound wave, has a millimeter magnitude size, is simple in structure, is easy to process and prepare, and facilitates the popularization and application. The four asymmetric transmission frequency bands are wider and are wide in range, and the positive transmittance of a part of asymmetric transmission frequency bands (the left-side incident sound wave) can reach 80%.

Description

technical field [0001] The invention belongs to the field of acoustic metamaterials, in particular to a multi-band acoustic wave asymmetric transmission device. Background technique [0002] Sound waves are common energy carriers in real life. The transmission of sound waves in ordinary media is bidirectional, that is, when sound waves are incident from both sides of the medium, there is no difference in their transmission properties. If asymmetric transmission of sound waves can be realized, it can be used in various important occasions that require special control of sound energy. For example, in the process of B-ultrasound imaging, firstly, ultrasonic waves are emitted into the body, and the reflected sound waves will be received by the receiving device. Ultrasonic images of internal organs or fetuses are obtained by analyzing reflected sound waves, so as to detect the health of internal organs or the development of fetuses. However, part of the reflected sound waves wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/30
Inventor 孙宏祥袁寿其夏建平
Owner JIANGSU UNIV