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Acoustic meta-material scatterer and sound insulation device thereof

A technology of sound insulation devices and scatterers, applied in sound insulation, soundproof doors/windows, ventilation layout, etc., can solve problems such as only considering the amplification behavior of evanescent waves

Inactive Publication Date: 2013-10-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The previous research on the negative refraction effect was mainly carried out around its sub-wavelength resolution imaging function, so only the amplification behavior of the uniform effective constitutive parameters on the acoustic evanescent wave was considered

Method used

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  • Acoustic meta-material scatterer and sound insulation device thereof
  • Acoustic meta-material scatterer and sound insulation device thereof
  • Acoustic meta-material scatterer and sound insulation device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] like Figure 5 As shown, the ultrasonic scatterer sound insulation device includes an ultrasonic scatterer and a frame structure. The frame structure is a window surrounded by frame 21. In this embodiment, the frame 21 is a wall. The inner contour of the frame structure is rectangular, and the length and width are L 1 and L 2 , the shell 12 of the ultrasonic scatterer is rectangular, and its length and width are respectively b 1 and b 2 , the inner core 11 of the ultrasonic scatterer is rectangular, and the length and width are respectively a 1 and a 2 The long side of the inner contour of the frame structure, the long side of the ultrasonic scatterer shell 12, and the long side of the ultrasonic scatterer inner core 11 are parallel to each other; the geometric center of the ultrasonic scatterer is the same as the inner contour geometric center of the frame structure. There is a ventilation area 3 between the ultrasonic scatterer and the frame structure. The son...

Embodiment 2

[0059] like Image 6 As shown, the ultrasonic scatterer sound insulation device includes an ultrasonic scatterer and a frame structure. The frame structure is a window surrounded by frame 21. The inner contour of the frame structure is a square, and the side length is L, and the shell 12 and the inner core 11 of the ultrasonic scatterer are all square, and the side length of the outer shell 12 is b, and the side length of the inner core 11 is a; The sides of the outer shell 12 of the superscatterer and the inner core 11 of the supersonic scatterer are parallel to each other; the geometric center of the supersonic scatterer is the same as the geometric center of the inner contour of the frame structure. There is a ventilation area 3 between the ultrasonic scatterer and the frame structure. The sonic diffuser is fixed in the center of the frame structure. The relationship between L, b, and a is satisfied: b 2 ≥ aL. The equivalent acoustic density ρ of the acoustic metamater...

Embodiment 3

[0064] like Figure 7As shown, the ultrasonic scatterer sound insulation device includes an ultrasonic scatterer and a frame structure. The frame structure is a window surrounded by frame 21. The inner contour of the frame structure is a square, the side length is L, the cross section of the outer shell 12 and inner core 11 of the ultrasonic scatterer is circular, the diameter of the outer shell 12 is b, and the diameter of the inner core 11 is a. The geometric center of the acoustic superscatterer is the same as the geometric center of the inner contour of the frame structure. There is a ventilation area 3 between the ultrasonic scatterer and the frame structure. The sonic diffuser is fixed in the center of the frame structure. The relationship between L, b, and a is satisfied: The equivalent acoustic density ρ of the acoustic metamaterial for the shell of an acoustic superscatterer 1 and modulus κ 1 satisfy the equation:

[0065] [ρ 1 ,κ 1 ]=[-ρ,-κ(2r / b) 4 ].

[...

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Abstract

The invention discloses an acoustic meta-material scatter sound insulation device. The acoustic meta-material scatter sound insulation device is composed of a frame structure and an acoustic meta-material scatterer arranged in the center of the frame structure. A ventilation region is formed between the frame structure and the acoustic meta-material scatterer. The acoustic meta-material scatterer comprises a core and a shell. The shell warps the outer portion of the core and is made of acoustic meta-materials. The acoustic meta-materials have gradient negative refractive indexes. The characteristic that the effective scattering sound cross section area of the acoustic meta-material scatterer is far larger than the geometrical cross section area of the acoustic meta-material scatterer is used for manufacturing the sound insulation device. The sound insulation device has ventilation performance and sound insulation performance, particularly has good sound insulation effect to low-frequency sound waves, and can be applied to building sound insulation and construction of sound insulation curtain walls on the two sides of a road or a railway.

Description

technical field [0001] The present invention relates to acoustic superstructures and sound insulation devices. Background technique [0002] With the acceleration of urbanization, noise pollution has become an important issue of environmental pollution. Traffic noise, construction noise and other pollution make people restless day and night, and have a serious impact on daily work, life and health. At present, using sound-proof windows to control noise is a common method, but people need to open the windows for ventilation, which directly leads to a significant drop in the sound-insulation performance of sound-proof windows. Therefore, it is of great significance to develop a ventilation and sound insulation window that can effectively isolate outdoor noise while naturally ventilating. The relevant research on ventilation and sound insulation windows at home and abroad has made some progress. Most of the sound insulation windows described in CN1482341 and other public pat...

Claims

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Application Information

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IPC IPC(8): E04B1/84E06B7/02E06B5/20E04B2/88
Inventor 程营魏琦吴大建刘晓峻
Owner NANJING UNIV
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