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An acoustic material capable of redirecting ultra-wideband sound waves

An acoustic material and redirection technology, applied in the direction of sound-generating devices and instruments, can solve the problems of large volume and complex structure, and achieve the effect of easy realization and simple structure

Active Publication Date: 2018-07-31
NANJING UNIV
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  • Summary
  • Abstract
  • 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 that can redirect ultra-wideband sound waves for the defects of large volume and complex structure in the prior art that have acoustic abnormal reflection, that is, redirection.

Method used

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  • An acoustic material capable of redirecting ultra-wideband sound waves
  • An acoustic material capable of redirecting ultra-wideband sound waves
  • An acoustic material capable of redirecting ultra-wideband sound waves

Examples

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Embodiment 1

[0033] Example 1: Sound Wave Redirection

[0034] see figure 2 , image 3 and Figure 4 Shown is a metasurface that produces a 45-degree reflection at normal incidence. At this time, the surface phase profile should satisfy a linear change. According to the concept of the generalized reflection law, the abnormal reflection angle is:

[0035]

[0036] The abnormal reflection angle θ can be obtained r The relationship with the gradient g(x) of the groove depth change is:

[0037] θ r =arcsin[sin(θ i )+2g(x)]

[0038] Note that the reflection angle in the formula has nothing to do with the wavelength, therefore, the proposed mechanism can eliminate the dependence on the wavelength, so as to realize the application in ultra-wideband. When the structural parameter g=0.3535 (that is, the groove depth satisfies h(x)=h 0 -0.3535x), you can get the effect of sound wave redirection as shown in the figure, figure 2 Shown in the sample for 7cm * 19.5cm (the width of groove ...

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Abstract

The invention discloses an acoustic material capable of redirecting ultra-broadband sound waves. Grooves of different depths arranged in sequence are arranged on the surface of the acoustic material, 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, an x-axis is established, 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 redirecting ultra-wideband sound waves of the present invention has a simple structure and is easy to implement, and only needs one sound source incident to realize ultra-wideband sound wave redirection orientation.

Description

technical field [0001] The present invention relates to an acoustic material capable of redirecting ultra-wideband 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 the sound wave interference effect is used to achieve various functions. Among them, sound wave redirection 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 redirecting ultra-wideband 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 redirecting ultra-broadband sound waves, aiming at the defects of bulky and complex structures in the prior art that have acoustic ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10K11/28
Inventor 梁彬朱一凡邹欣晔李睿奇江雪屠娟程建春
Owner NANJING UNIV