An acoustic metasurface experimental device

An experimental device and surface-mounted technology, applied in teaching models, instruments, educational appliances, etc., can solve the problems of complex structure, narrow transmission bandwidth, inconsistent simulation results, etc., and achieve the effect of expanding application scope, output frequency bandwidth, and simple structure

Active Publication Date: 2020-07-10
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, metasurfaces also face many problems, such as narrow transmission bandwidth, complex structures that are difficult to transform, limited forms of acoustic wave control, and simulation results that do not match reality, etc.

Method used

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  • An acoustic metasurface experimental device
  • An acoustic metasurface experimental device
  • An acoustic metasurface experimental device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as Figure 1 to Figure 9 As shown, an acoustic metasurface experimental device provided by the present invention includes a sound source excitation module 1, a metasurface module 2 and a detection and noise reduction module 3 connected in sequence, and the noise reduction module 3 is connected with a microphone, and the sound wave is excited by the sound source. After the module 1 is generated, the metasurface module 2 gathers the sound pressure signal through the microphone.

[0031] The sound source excitation module 1 comprises a planar wave tube 10, a speaker cover 11, a horn cover 12, a speaker cover support 13, a speaker support chassis 14, a speaker short bracket 15 and a speaker, and the speaker cover 11 is connected to the planar wave tube 10 by bolts, The speaker cover 12 is connected to the inside of the speaker cover 11 through the speaker cover bracket 13, the speaker support chassis 14 is connected to the inside of the speaker cover 11 through the spe...

Embodiment 2

[0060] Compared with the first embodiment, the present embodiment does not install the plane wave tube 10, and directly connects the speaker cover 11 to the metasurface module 2, which is the point sound source excitation.

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Abstract

The invention discloses an acoustic meta-surface experimental device comprising a sound source excitation module, a meta-surface module and a detection and noise reduction module that are connected successively. The detection and noise reduction module is connected with a microphone. A sound wave is generated by the sound source excitation module and then is focused by the meta-surface module; andthen the microphone processes the sound pressure signal. The experimental device has advantages of simple structure and great convenience in mounting and dismounting. The output frequency band of theloudspeaker is wide; frequency requirements of different sound waves are met; and the sound source signal types are variable.

Description

technical field [0001] The invention belongs to the technical field of acoustic metasurfaces, and in particular relates to an acoustic metasurface experimental device. Background technique [0002] Sound wave is a kind of mechanical wave, usually manifested as longitudinal wave, the essence of its propagation is the transmission of energy in the medium. With the advancement of science and technology, acoustics has gained important applications in underwater exploration, underground exploration, biomedicine, military weapons and other fields. In this process, the effective control of wave fronts and the improvement of transmission efficiency are crucial. [0003] The emergence of metasurfaces in recent years has had a major impact on the fields of acoustics and electromagnetic waves. Metasurfaces have properties that natural materials do not have. Compared with traditional acoustic control technologies, such as phased arrays and parametric arrays, metasurfaces rely on the ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09B23/14
CPCG09B23/14
Inventor 莫继良龚柯梦汪小凡冷子珺徐敬业周仲荣
Owner SOUTHWEST JIAOTONG UNIV
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