Adjustable single-frequency underwater acoustic one-way transmission device under linear system

A linear system and one-way transmission technology, applied in the field of acoustic metamaterials, can solve the problems of lack of frequency uniqueness and adjustability, unfavorable underwater precision filtering, underwater acoustic confidential communication, etc.

Active Publication Date: 2020-08-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects that the frequency band generated by the existing one-way transmission device has a certain bandwidth, lacks frequency uniqueness and adjustability, and is not conducive to applications such as underwater precision filtering and underwater acoustic security communication, the present invention provides a linear system. An adjustable single-frequency underwater sound one-way transmission device, which can form a narrow passband in the first forbidden band by using the double-crystal resonance tunneling effect, so as to realize the one-way transmission of a single-frequency sound wave; at the same time, it can change the "aluminum-water "The thickness of the resonant cavity in the twin crystal structure and the grid constant of the one-dimensional periodic grid plate are adjusted to select the frequency of one-way conduction

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  • Adjustable single-frequency underwater acoustic one-way transmission device under linear system
  • Adjustable single-frequency underwater acoustic one-way transmission device under linear system
  • Adjustable single-frequency underwater acoustic one-way transmission device under linear system

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Embodiment 1

[0027] combined with figure 1 As shown, a tunable single-frequency underwater acoustic one-way transmission device under a linear system includes a one-dimensional periodic grid plate and an "aluminum-water" twin-crystal structure; the "aluminum-water" twin-crystal structure is composed of Two one-dimensional fluid-solid phononic crystals with a period of 5 are separated by a certain distance, and the space between the two single crystals forms a resonant cavity; the one-dimensional periodic grid plate is located on the side of the "aluminum-water" twin crystal structure .

[0028] Wherein, the thickness of the water layer of the two one-dimensional fluid-solid phononic crystals with a period number of 5 is d 1 =4mm, the thickness of the solid plate is d 2 =4mm; the distance between the one-dimensional periodic grid plate and the "aluminum-water" twin crystal structure is d 0 =2mm, the cross-section of the one-dimensional periodic grid plate is a rectangle, wherein the heig...

Embodiment 2

[0038] The adjustable single-frequency underwater acoustic one-way transmission device model under the linear system is established by COMSOL Multiphysics finite element simulation. Now keep the "aluminum-water" twin crystal structure and the structural parameters of the one-dimensional periodic grid plate unchanged, that is, d 1 = 4mm, d 2 = 4mm, d R =12mm, h=10mm, w=2mm, select grid constant as A 1 = 20mm. image 3 (a) The sound pressure distribution diagrams of the forward and reverse vertical incident sound waves with a frequency of 150644.494 Hz are given, from image 3 The obvious one-way transmission of sound waves can be seen in the sound pressure distribution of forward and reverse incidence. like image 3 As shown in (b), the transmission curves of the forward and reverse normal incidence of sound waves in the frequency range of 150000Hz-152000Hz are given. When the sound wave is vertically incident, due to the resonant tunneling effect, the forward transmittan...

Embodiment 3

[0041] The tunable narrowband unidirectional transmission device model is established by COMSOL Multiphysics finite element simulation. Now keep the "aluminum-water" twin crystal structure and the material parameters of the one-dimensional periodic grid plate unchanged, that is, d 1 = 4mm, d 2 =4mm, h=10mm, w=2mm, A=16mm, select the thickness of the resonant cavity as d R1 = 8mm. Figure 5 (a) The sound pressure distribution diagrams of the forward and reverse vertical incident sound waves with a frequency of 147315.4 Hz are given, from Figure 5 The obvious one-way transmission of sound waves can be seen in the sound pressure distribution of forward and reverse incidence. like Figure 5 As shown in (b), the transmission curves of the forward and reverse normal incidence of sound waves in the frequency range of 144000Hz-150000Hz are given respectively. When the sound wave is vertically incident, due to the resonant tunneling effect, the forward transmittance of the sound ...

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Abstract

The invention discloses an adjustable single-frequency underwater acoustic one-way transmission device under a linear system, and belongs to the field of acoustic metamaterials. The device is formed by coupling a one-dimensional periodic grid plate and an aluminum-water bicrystal structure; the aluminum-water bicrystal structure is formed by connecting two one-dimensional fluid-solid phononic crystals with the cycle number of 5 in series according to a certain interval, and a resonant cavity is formed by the interval part between the two single crystals. One-way transmission of single-frequency sound waves is achieved, the one-way transmission frequency can be selected by changing the thickness dR of the resonant cavity in the aluminum-water bicrystal structure and adjusting the grid constant A of the one-dimensional periodic grid plate, and the adjustable single-frequency underwater acoustic one-way transmission device can be applied to the fields of underwater sound wave filtering, secret communication and the like.

Description

technical field [0001] The invention belongs to the field of acoustic metamaterials, in particular to an adjustable single-frequency underwater sound one-way transmission device under a linear system. Background technique [0002] As we all know, the electronic diode is the first artificial device that can produce rectification effect, which has made an important contribution to the development of information technology. Inspired by electronic diodes, the unidirectional manipulation of other energy carriers has also been extensively studied. Acoustic waves are the only carrier capable of long-distance energy transmission underwater, and play an important role in the fields of marine acoustics and underwater acoustics. If an acoustic diode device can be designed for one-way regulation of underwater sound waves, which has a one-way transmission characteristic similar to that of an electronic diode, it will have very important scientific significance and application value. At...

Claims

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Application Information

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IPC IPC(8): G10K11/26
CPCG10K11/26Y02A90/30
Inventor 范鹤腾张赛邢佳丽张凯凯周俊
Owner JIANGSU UNIV
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