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Acoustic material having ultra-wideband acoustic extraordinary reflection function

An acoustic material and ultra-broadband technology, applied in the direction of sound-generating devices, instruments, etc., can solve problems such as complex structure and large volume

Inactive Publication Date: 2015-09-16
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 for the acoustic material with ultra-broadband acoustic super-normal reflection in the prior art, which has a large volume and complex structure

Method used

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  • Acoustic material having ultra-wideband acoustic extraordinary reflection function
  • Acoustic material having ultra-wideband acoustic extraordinary reflection function
  • Acoustic material having ultra-wideband acoustic extraordinary reflection function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1: Sound Wave Redirection

[0050] 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:

[0051] θ r = arcsin [ sin ( θ i ) + λ 2 π dφ dx ]

[0052] The abnormal reflection angle θ can be obtained r The relationship with the gradient g(x) of the groove depth change is:

[0053] θ r =arcsin[sin(θ i )+2g(x)]

[0054] Note that the reflection angle in Equation 3 has nothing to do with wavelength, therefore, the proposed mechanism can eliminate the depende...

Embodiment 2

[0056] Embodiment 2: Acoustic focusing:

[0057] see Figure 5 , Figure 6 and Figure 7 As shown, the numerical simulation results of acoustic wave focusing are shown, and the phase profile of the surface satisfies:

[0058] φ ( x ) = k 0 [ ( x - x 0 ) 2 + y 0 2 - x 0 2 + y 0 2 ]

[0059] Then the groove depth distribution is:

[0060] h ( x ) ...

Embodiment 3

[0062] Example 3: Curved sound field

[0063] see Figure 8 , Figure 9 and Figure 10 As shown, it shows the numerical simulation results of the bending sound field at three frequencies (7277Hz, 12128Hz, 16979Hz) under the condition of normal incidence of sound waves (the width of the groove in the sample is d=0.75cm, and the thickness of the groove wall is d 0 =0.25cm), the dotted line is the designed curved route, the curved sound field can be produced by the following phase profile:

[0064] φ ( x ) = k 0 [ ( x + r ) 2 - r 2 - r ( r x + r ...

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Abstract

The invention discloses an acoustic material having an ultra-wideband acoustic extraordinary reflection function. A surface of the acoustic material is provided with different-depth grooves which are successively arranged; the widths d of the grooves are the same, wherein [lambda]>2d, and [lambda] is the wavelength of a sound wave; distances between the adjacent grooves are d<0>, wherein d>=3d<0>; and an x axis is established, and the x axis is parallel to the surface and is perpendicular to the grooves, wherein depths of the grooves are h(x) and are represented by the formula h(x). The acoustic material having the ultra-wideband acoustic extraordinary reflection function only needs incidence of one sound source and then can achieve ultra-wideband wavefront control, a traditional loudspeaker array is replaced, and a single-frequency limit of an acoustic super surface is broken through. The acoustic material can be applied to ultrasonic therapy, noise control or some special sound wave manipulation occasions.

Description

technical field [0001] The invention relates to an acoustic material with ultra-broadband acoustic supernormal reflection. 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, such as sound wave redirection, sound wave focusing, or curved sound field. And some passive methods such as acoustic metasurfaces can only work at a single frequency or narrow bandwidth. [0003] Therefore, a new acoustic material with ultra-broadband acoustic super-reflection is needed to solve the above problems. Contents of the invention [0004] The object of the present invention is to provide an acoustic material with ultra-broadband acoustic super-reflection with a simple structure, aiming at the defects of large volume and complex structure in the prior art. [0005] In order to achie...

Claims

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Application Information

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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
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