Compound sound barrier structure based on photonic crystals

A phononic crystal and sound barrier technology, applied in noise absorbing devices, buildings, etc., can solve the problems of poor noise reduction effect at medium and low frequencies, single structure of the sound barrier, insufficient overall noise reduction ability, etc. simple structure

Active Publication Date: 2018-11-02
EAST CHINA JIAOTONG UNIVERSITY
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  • Abstract
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Problems solved by technology

[0005] In order to solve the problem that the existing sound barrier structure is single and the overall noise reduction ability is insufficient, especially the noise reduction effect on the middle and low frequency noise is poor, and further provides a composite sound barrier structure based on phononic crystals;

Method used

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  • Compound sound barrier structure based on photonic crystals
  • Compound sound barrier structure based on photonic crystals
  • Compound sound barrier structure based on photonic crystals

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specific Embodiment approach 2

[0042] Specific implementation mode two: combination figure 1 Note that the round holes on the first-level sound-absorbing panel 1, the second-level sound-absorbing panel 2, and the third-level sound-absorbing panel 3 are equipped with cylindrical Bragger-type phononic crystal sound-absorbing components 5, 6, and 7 that match the round holes; On the four-stage sound-absorbing panel 4, the tubular cylindrical local resonant phononic crystal sound-absorbing components 8 and 9 are uniformly and periodically installed. With such arrangement, the connection is convenient and reliable, and it is convenient to use.

[0043] Preferably, the scatterer 10 is an annular sheet structure matching the circular through holes on the respective cylinders 11 . Such setting facilitates processing, and at the same time, the period number of the periodic material scatterer is also greatly increased, and the sound absorption effect in the band gap is significantly improved.

[0044] Preferably, t...

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Abstract

The invention provides a compound sound barrier structure based on photonic crystals, relates to a sound barrier and aims to solve the problem that most existing sound barriers are mainly vertical sound barriers, the noise reducing performance is obviously poor, and especially the noise reducing effect on noise of low and medium frequency is poor. The compound sound barrier structure comprises a primary sound absorption plate, a secondary sound absorption plate, a tertiary sound absorption plate and a quaternary sound absorption plate, wherein the quaternary sound absorption plate and the tertiary sound absorption plate are connected to form a whole, the tertiary sound absorption plate and the secondary sound absorption plate are connected to form a whole, and the secondary sound absorption plate and the primary sound absorption plate are connected to form a whole. The compound sound barrier structure achieves noise isolation.

Description

technical field [0001] The invention belongs to the field of noise protection, in particular to a sound barrier structure based on phonon crystals. Background technique [0002] Noise pollution has become the third largest pollution in the world after air pollution and water pollution. Among the many types of noise, traffic noise is becoming more and more prominent and harmful. With the development of our country's infrastructure, the highway and railway network are becoming more and more dense, and the impact of traffic noise pollution on people's lives is also becoming more and more serious. [0003] As an effective way to prevent and control road traffic noise pollution, sound barriers have been widely used in the prevention and control of road traffic noise pollution. However, the top structure of the existing sound barriers has limited attenuation of diffracted sound, and the additional noise reduction effect is not ideal, resulting in the sound barrier The overall noi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01F8/00
CPCE01F8/0029
Inventor 冯青松杨舟余晨曦
Owner EAST CHINA JIAOTONG UNIVERSITY
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