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Acoustic Ultrasonic Scatterer and Its Sound Insulation Device

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: 2016-02-24
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 Ultrasonic Scatterer and Its Sound Insulation Device
  • Acoustic Ultrasonic Scatterer and Its Sound Insulation Device
  • Acoustic Ultrasonic Scatterer and Its Sound Insulation Device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as 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 cross-section of the inner contour of the frame structure is a rectangle, the length and width of which are L1 and L2 respectively, the cross-section of the shell 12 of the ultrasonic scatterer is rectangular, and the length and width are b1 and b2 respectively, and the cross-section of the inner core 11 of the ultrasonic scatterer is a rectangle , the length and width are a1 and a2 respectively; the long side of the inner contour of the frame structure, the long side of the outer shell 12 of the ultrasonic scatterer, and the long side of the inner core 11 of the ultrasonic scatterer are parallel to each other; the geometric center of the ultrasonic scatterer and the frame structure The geometric centers of the inner contours are the s...

Embodiment 2

[0058] Such as Figure 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 profile cross-section of the frame structure is a square, and the side length is L, and the cross-sections of the shell 12 and the inner core 11 of the ultrasonic scatterer are all square, the side length of the shell 12 is b, and the side length of the inner core 11 is a; The inner contour edge, the edge of the outer shell 12 of the ultrasonic scatterer, and the inner edge 11 of the ultrasonic scatterer are parallel to each other; the geometric center of the ultrasonic 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. ...

Embodiment 3

[0062] Such as Figure 7 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 cross-section of the inner contour of the frame structure is square, and the side length is L. The cross-sections of the shell 12 and the inner core 11 of the ultrasonic scatterer are both 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 ρ1 and modulus κ1 of the acoustic metamaterial of the shell of the ultrasonic scatterer satisfy the equation:

[0063] [ρ 1 ,κ 1 ...

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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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Patent Type & Authority Patents(China)
IPC IPC(8): E04B1/84E06B7/02E06B5/20E04B2/88
Inventor 程营魏琦吴大建刘晓峻王敬时
Owner NANJING UNIV
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