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A direction-controllable sound-enhanced transmission device

A sound enhancement and device technology, applied in the field of acoustic metamaterials, can solve the problems of undirectional transmission of sound transmission energy, large size, complex structure, etc., and achieve the effect of being conducive to popularization and application, moderate size, and simple device structure

Inactive Publication Date: 2018-11-06
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the shortcomings of the traditional sound-enhanced transmission device, the sound transmission energy is concentrated on the surface of the structure, the structure is complex, the size is large, and the sound transmission energy cannot be transmitted in a direction. Realization and controllable transmission energy direction of sound-enhanced transmission device

Method used

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  • A direction-controllable sound-enhanced transmission device
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  • A direction-controllable sound-enhanced transmission device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] figure 1It is the three-dimensional structure schematic diagram of the sound wave enhanced transmission device described in the present invention, in order to simplify the calculation, according to the cylindrical symmetry of the metal hollow cylinder 2 and the cylindrical sound source, it is simplified to a two-dimensional model of the x-y plane, as figure 2 shown. The finite element numerical method is used to establish the model of metal hollow cylinder 2 submerged in water, and the acoustic wave enhanced transmission performance is calculated. Wherein the material of the hollow cylinder is brass; the outer diameter R=20.0mm, the inner diameter r=15.0mm; the material parameters are respectively: 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. The excitation sound source is a cylindrical sound source, and its position is ...

Embodiment 2

[0056] Now keep the material parameters of brass and water constant, and change the inner and outer radii of the brass hollow cylinder, the frequency of sound-enhanced transmission will change. Such as Figure 7 As shown in (a) and 7(b), when the geometric parameters of the brass hollow cylinder are R=2.0μm and r=1.5μm, the frequency of sound-enhanced transmission can be as high as 1603.9MHz, and when the geometric parameters of the brass hollow cylinder are When R=2.0m and r=1.5m, the frequency of sound-enhanced transmission can be as low as 1604Hz. and image 3 (b) Compared with the geometric parameters and frequency of the brass hollow cylinder, the frequency of sound-enhanced transmission is inversely proportional to the overall size of the cylindrical structure. When the brass hollow cylinder shrinks overall, the frequency of sound-enhanced transmission increases; when the brass As the size of the hollow cylinder increases, the frequency of acoustically enhanced transmi...

Embodiment 3

[0058] In addition to brass, the sound-enhanced transmission effect based on the hollow columnar structure proposed by the present invention can also be applied to other metal materials. Figure 8 (a) and 8(b) represent the sound pressure amplitude distribution diagrams of the steel cylinder and the aluminum cylinder respectively excited by cylindrical acoustic waves with frequencies of 160.58kHz and 161.53kHz. The geometric parameters of metal hollow cylinder 2 and image 3 The same, the material parameters are: the density of steel is 7800kg / m 3 , the longitudinal wave velocity is 6100m / s and the transverse wave velocity is 3300m / s; the density of aluminum is 2700kg / m 3 , the longitudinal wave velocity is 6260m / s and the shear wave velocity is 3080m / s. It can be seen that the incident cylindrical acoustic wave is excited from the hollow cylinder, which also produces an acoustically enhanced transmission effect on the outside of the cylinder. It shows that the columnar str...

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Abstract

The invention discloses a direction controllable sound reinforcement transmission device, comprising a sound wave generation device, a metal hollow cylinder and water. A circular column sound source generation device is positioned in a metal hollow circular column and is used for generating a cylindrical surface sound wave; the metal hollow cylinder is immersed in the water; the inner diameter of the metal hollow cylinder is r=1.5 Mum-1.5m, and the outer diameter is R=2.0Mum-2.0m. The sound reinforcement transmission device is based on the sound reinforcement transmission effect of the hollow cylinder structure; the sound pressure amplitude on the outside of the metal hollow cylinder is increased by 20 times, and the transmission direction of the waveform is constant; the frequency range of the sound reinforcement transmission is wide, and the used frequency range is 100Hz-1GHz; and the sound transmission energy magnitude, switching on and off, and the emergent direction can be controlled through adjusting the position of a cylinder sound source generation device inside the metal hollow cylinder. The direction controllable sound reinforcement transmission device is simple in structure, medium in size, easy to process and integrate, and is used in the medical science ultrasonic detection device, a confidential sound communication emitter and a sound wave detector.

Description

technical field [0001] The invention belongs to the field of acoustic metamaterials, in particular to a direction-controllable sound-enhanced transmission device. Background technique [0002] Sound waves are common energy carriers in real life. During the propagation of sound waves, they will encounter various reflective objects and be affected. If the sound waves pass through reflective objects, the sound waves can pass through the reflective objects, and the acoustic transmission energy flux density will be further improved. Enhancement is the acoustic enhancement transmission effect. If the sound-enhanced transmission effect can be realized, it can be applied to various important occasions that require special control of sound energy, such as: medical ultrasound, secure communication, sound wave detection, etc. Therefore, the research on sound-enhanced transmission devices has very important academic value and application prospect. [0003] There are three main structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/26
Inventor 孙宏祥袁寿其夏建平
Owner JIANGSU UNIV