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An acoustic material capable of focusing ultra-broadband sound waves

An acoustic material and ultra-broadband technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of narrow working bandwidth, large volume of acoustic materials, complex structure, etc., and achieve the effect of easy implementation, simple structure, and ultra-broadband acoustic wave focusing.

Active Publication Date: 2018-07-31
NANJING UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an acoustic material with a simple structure capable of focusing ultra-broadband sound waves, aiming at the defects of large volume, complex structure and narrow working bandwidth of the acoustic material with acoustic focusing function in the prior art

Method used

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  • An acoustic material capable of focusing ultra-broadband sound waves
  • An acoustic material capable of focusing ultra-broadband sound waves
  • An acoustic material capable of focusing ultra-broadband sound waves

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: Acoustic focusing:

[0034] see figure 2 , image 3 and Figure 4 As shown, the numerical simulation results of acoustic wave focusing are shown, and the phase profile of the surface satisfies:

[0035]

[0036] Then the groove depth distribution is:

[0037]

[0038] Among them, h 2 is a constant, x is the projected coordinates of grooves with different depths on the x-axis, (x 0 ,y 0 ) is the coordinates of the focal point of the sound wave, (d+d 0 )sinθ is the compensation item, and θ is the incident angle of sound wave. In the present invention, the groove is perpendicular to the surface, the compensation item can be omitted, and the operation is simpler and more convenient. The width of the grooves is 0.75 cm, and the distance between adjacent grooves is 0.25 cm.

[0039] figure 2 , image 3 and Figure 4 shows the sound field intensity distribution at three frequencies (7277Hz, 12128Hz, 16979Hz) when the sound wave is vertically i...

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Abstract

The invention discloses an acoustic material capable of focusing ultra-broadband sound waves. The surface of the acoustic material is provided with sequentially arranged grooves of different depths, and the width d of the grooves is the same, wherein, λ>2d, λ is The wavelength of the sound wave, the distance between adjacent grooves is d0, wherein, d≥3d0, establishes the x-axis, the x-axis is parallel to the surface and perpendicular to the groove, wherein the depth of the groove is h( x), wherein, the depth of the groove is represented by the following formula h(x): The acoustic material capable of focusing ultra-broadband sound waves of the present invention has a simple structure and is easy to realize, and can realize ultra-broadband sound wave focusing.

Description

technical field [0001] The invention relates to an acoustic material capable of focusing ultra-broadband sound waves. Background technique [0002] Phased array technology is a commonly used technology in acoustics. Usually, loudspeaker sequences with different phases are used to form a phase profile, and various functions are realized by using the sound wave interference effect. Among them, sound wave focusing is an important application. And some passive methods such as acoustic metasurfaces can only work at a single frequency or narrow bandwidth. [0003] Therefore, a new acoustic material capable of focusing ultra-broadband acoustic waves is needed to solve the above-mentioned problems. Contents of the invention [0004] The object of the present invention is to provide an acoustic material with a simple structure capable of focusing ultra-broadband sound waves, aiming at the defects of large volume, complex structure and narrow working bandwidth of the acoustic mater...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/26
Inventor 梁彬朱一凡邹欣晔李睿奇江雪屠娟程建春
Owner NANJING UNIV
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