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A composite sound barrier

A kind of sound barrier and composite technology, which can be used in buildings, noise absorption devices, etc., can solve the problems of poor noise reduction performance and stability, and achieve the effects of easy assembly, suppression of noise transmission, and good noise reduction effect.

Active Publication Date: 2021-03-16
EAST CHINA JIAOTONG UNIVERSITY
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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 solve the problems of poor noise reduction performance and stability of existing railway sound barriers based on the shortcomings of the above-mentioned prior art. The present invention provides a high-speed railway composite acoustic The composite sound barrier achieves the technical purpose of sound absorption and noise reduction by adopting various sound absorption measures such as three-dimensional quasi-phononic crystals, micro-perforated plates, and resonant sound-absorbing chambers.

Method used

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Effect test

Embodiment 1

[0028] like Figure 1-5 As shown, this embodiment specifically relates to a composite sound barrier unit using three-dimensional quasi-phononic crystals and multiple sound absorption principles. The overall height of the sound barrier unit is preferably 3.5m to 4.5m; the sound barrier unit includes sound The top of the barrier unit, the middle of the sound barrier unit, the bottom of the sound barrier unit and the base are all connected and fixed by mechanical structures (for example, fixed by angle steel 5, bolts 6 and nuts 7).

[0029] The top of the sound barrier unit is placed with two Y-shaped hollow metal plates 1 with unilateral openings. The Y-shaped structure is the original design of the applicant. Research has found that the Y-shaped structure can effectively reduce the sound edge compared with a single plate. Diffraction at the top of the sound barrier, thereby improving the sound absorption efficiency of the sound barrier structure, and the test found that the eff...

Embodiment 2

[0048] Embodiment 2: as Figures 1 to 6 As shown, in this embodiment, the arrangement of the sound barrier structure, the first phononic crystal unit 17 and the second phononic crystal unit 18 is the same as in Embodiment 1; the difference between the two is that the first phononic crystal unit 17 and the second phononic crystal unit The structural composition of the two-phonon crystal unit 18.

[0049] In this embodiment, the first phononic crystal unit 17 includes a piezoelectric ceramic core material and a pure copper metal film arranged on the surface of the piezoelectric ceramic core material; when the sound wave propagates to the first phononic crystal unit 17, the piezoelectric ceramic The core material will vibrate under the action of sound waves, and convert part of the vibration energy into electrical energy. The pure copper metal film can immediately convert the charge on the surface of the piezoelectric ceramic into heat energy through the resistance effect, thereb...

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Abstract

The invention relates to a composite type sound barrier. The composite type sound barrier comprises a sound barrier unit, and is characterized in that the sound barrier unit comprises a sound barrierunit top, a sound barrier unit middle portion, a sound barrier unit bottom and a base, wherein the sound barrier unit top comprises two unilateral-open hollow metal plates which are distributed in a Y-shaped mode, and openings face the direction of a noise source.

Description

technical field [0001] The invention belongs to the technical field of noise reduction equipment for high-speed railways, and in particular relates to a composite sound barrier for high-speed railways based on three-dimensional quasi-phononic crystals. Background technique [0002] With the rapid development of my country's economic construction, the rail transit industry, especially the high-speed railway transportation industry, has developed rapidly, and the operating speed of high-speed railway vehicles has also increased day by day. With the increase of train speed, the noise generated by high-speed railway vehicles is more and more disturbing to the environment along the line. In order to reduce the impact of the noise generated by the train running on the surrounding residents along the railway, a certain number of sound barriers are often set up on both sides of the line, which can prevent the noise generated by the train from being transmitted to the residents, ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01F8/00
CPCE01F8/0047
Inventor 冯青松孙魁黎子荣王威雷晓燕
Owner EAST CHINA JIAOTONG UNIVERSITY