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Wide incident angle sub-wavelength underwater sound unidirectional transmission device and transmission control method thereof

A unidirectional transmission and sub-wavelength technology, applied in the field of acoustic metamaterials, can solve the problems of small size and rectification efficiency, and achieve the effects of easy preparation, promotion of miniaturization and integration, and simple structure

Active Publication Date: 2019-03-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure has many advantages such as small size, wide frequency bandwidth, waveform preservation and high rectification efficiency, however, the rectification effect is only effective for a specific incident angle
[0005] As we all know, the sound waves emitted by the transducer are divergent waves with multiple directions in practice, and there are almost no sub-wavelength structure designs for multi-angle incident sound waves.

Method used

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  • Wide incident angle sub-wavelength underwater sound unidirectional transmission device and transmission control method thereof
  • Wide incident angle sub-wavelength underwater sound unidirectional transmission device and transmission control method thereof
  • Wide incident angle sub-wavelength underwater sound unidirectional transmission device and transmission control method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown in (a), a wide incident angle sub-wavelength underwater acoustic unidirectional transmission device, including a one-dimensional flow / solid type acoustic grating 1 and cascaded flow / solid type superlattice 2, in which the cascaded flow / solid type superlattice Lattice 2 consists of a cascade of fluid / solid superlattice 1 and fluid / solid superlattice 2; the device extends infinitely in the y direction and periodically repeats in the z direction; the device is placed in water with a white background The area is water. The incident plane acoustic wave enters the device from the side of the one-dimensional flow / solid type acoustic grating along the plane at 44°-62°, and deviates from the original propagation direction after passing through the acoustic grating diffraction, and falls into the passband of the cascaded flow / solid type superlattice In the middle; when the incident plane wave is incident on the device from the side of the superlattice a...

Embodiment 2

[0034] Embodiment 2 simulation verification

[0035]In the present invention, the COMSOL Multiphysics finite element simulation is used to establish a wide incident angle sub-wavelength underwater acoustic one-way transmission device model. Among them, the parameters of the device are the same as the above parameters; the material of the sound barrier is stainless steel, and the material parameters used in the calculation are: the density of stainless steel is 7800kg / m 3 , sound velocity of longitudinal wave is 6100m / s, sound velocity of transverse wave is 3300m / s; density of epoxy resin is 1100kg / m 3 , the sound velocity of longitudinal wave is 2400m / s, the sound velocity of transverse wave is 1100m / s; the density of hard rubber is 1200kg / m 3 , sound velocity of longitudinal wave is 2300m / s, sound velocity of transverse wave is 940m / s; water density is 1000kg / m 3 , the sound velocity of longitudinal wave is 1500m / s.

[0036] figure 2 The transmission spectra of the super...

Embodiment 3

[0040] In order to further illustrate the effect of the subwavelength structure on the wide-angle unidirectional transmission pair in practice, a line acoustic source is used to excite the incident acoustic wave. The width of the line sound source is 15cm and the frequency is 50kHz. The sound intensity distribution of the line sound source was simulated by using the finite element software COMSOLMultiphysics, as shown in Figure 5 (a) shown. The sound field excited by the line sound source contains a main lobe with an angular width of about 20° and several side lobes with little energy.

[0041] Such as Figure 5 As shown, a wide incident angle sub-wavelength underwater acoustic one-way transmission device, its material parameters are the same as in Example 1, selected as figure 1 (b) 2D model of several cycles shown. The finite element method is used to establish the model of the sub-wavelength underwater acoustic one-way transmission device with a wide incident angle. Th...

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Abstract

The present invention discloses a wide incident angle sub-wavelength underwater sound unidirectional transmission device and a transmission control method thereof. Acoustics metamaterials are constructed, and in a condition that the thickness of the acoustics metamaterials is smaller than the wavelength of an incident sound wave, the asymmetric transmission of the wide incident angle incident sound wave is achieved; the acoustics metamaterials are formed by coupling one-dimensional flow / solid type diffraction acoustic grating and a cascading flow / solid type superlattice, the cascading flow / solid type superlattice is formed by cascading two flow / solid type diffraction acoustic gratings with different materials; the acoustics metamaterials are obvious in the asymmetric transmission effect oflow-frequency incident sound wave with 44-62 degrees, the highest commutating ratio can reach 1012, the asymmetric transmission frequency band of the acoustics metamaterials is wide, and the acoustics metamaterials have waveform preservation at the sub-wavelength area. The wide incident angle sub-wavelength underwater sound unidirectional transmission device is simple in structure and easy to prepare, facilitate promotion of the development of the mini-type and the integration of the underwater sound energy flow control device, and has important application values special in the fields of underwater communication and signal transmission.

Description

technical field [0001] The invention belongs to the field of acoustic metamaterials, in particular to a sub-wavelength underwater acoustic one-way transmission device with a wide incident angle and a transmission control method. Background technique [0002] Acoustic waves are energy carriers for underwater long-distance information transmission, and usually, the propagation of sound waves in a medium is bidirectional. If the one-way transmission of sound waves can be realized, it will have important application value in the fields of underwater acoustic communication and signal transmission. In order to realize the unidirectional or asymmetric transmission of sound waves, artificial media that break time-reversal symmetry or space-reversal symmetry have been considered. Among them, phononic crystals play a very important role in the manufacture of acoustic one-way transmission devices. [0003] For example, the asymmetric transmission of sound waves can be realized by usi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/36H04B13/02
CPCH04B13/02G10K11/36
Inventor 张赛陆伟许伯强肖妍商德江
Owner JIANGSU UNIV
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