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Wedge-shaped perlite resonance acoustical tile

A kind of resonance sound absorption and perlite technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of loud reflection, poor sound absorption performance, inconvenient transportation, etc., and achieve the effect of reducing sound wave reflection, improving sound absorption performance, and avoiding sound reflection.

Active Publication Date: 2012-04-18
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Abstract
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Problems solved by technology

Due to the sudden change of acoustic impedance between these materials and the air, there is a large acoustic reflection when the sound wave is incident on the surface of the sound-absorbing brick, thereby reducing the sound-absorbing performance of the sound-absorbing brick.
At the same time, because conventional sound-absorbing bricks do not have a closed air resonance cavity inside the sound-absorbing brick, the sound absorption performance at low frequencies is poor.
[0003] At present, a large number of railways (including passenger dedicated lines) use perlite composite sound-absorbing panels to make sound barriers. However, due to their large volume, it is inconvenient to transport, and it is difficult to form a cavity behind them. Their sound absorption performance is limited, which limits their scope of application.

Method used

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  • Wedge-shaped perlite resonance acoustical tile
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  • Wedge-shaped perlite resonance acoustical tile

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Embodiment Construction

[0037] This embodiment relates to a perlite wedge resonant sound-absorbing brick, see Figure 1-4 , It is characterized in that the surface of the sound-absorbing brick facing the sound wave incident direction R is wedge-shaped (that is, triangular shape); a shape-closed air resonance cavity is built inside the sound-absorbing brick. The air resonant cavity is a spherical cavity, which is arranged according to the size of the volume, that is, the closer to the sound wave incident part, the smaller the volume.

[0038] The specific arrangement and size of the air resonance cavity are preferably as follows: a first spherical cavity 1 with a diameter of 25-45 mm is set near the center of the sharp corner, and then two 50-70 mm diameters are respectively arranged at symmetrical positions along the center line O-O. The second spherical cavity 2, followed by two third spherical cavities 3 with a diameter of 80-100 mm at symmetrical positions along the center line O-O.

[0039] The ...

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Abstract

The invention relates to a wedge-shaped perlite resonance acoustical tile, which is mainly made of expanded perlite and cement and is characterized in that the surface of the acoustical tile, which faces the incident direction of acoustic waves, is wedge-shaped; and a closed air resonance cavity is constructed inside the acoustical tile. The acoustic absorption coefficient of the wedge-shaped perlite resonance acoustical tile disclosed by the invention is greater than 0.75 in the frequency range of 125-5000Hz, the noise reduction coefficient of the wedge-shaped perlite resonance acoustical tile reaches 0.93, and the wedge-shaped perlite resonance acoustical tile can be used for manufacturing high-efficiency acoustical barrier of railways and roads.

Description

technical field [0001] The invention relates to a sound barrier in the field of noise reduction and noise reduction, in particular to perlite wedge resonant sound-absorbing bricks. Background technique [0002] Sound-absorbing brick masonry sound barrier is one of the important forms of sound barrier to reduce traffic noise. It is widely used in the field of traffic control. The current sound-absorbing bricks include perlite sound-absorbing bricks, ceramsite sound-absorbing bricks, and slag sound-absorbing bricks. , Sawdust sound-absorbing bricks, etc., are generally flat or corrugated. Due to the sudden change in the acoustic impedance between these materials and the air, there is a large acoustic reflection when the sound wave is incident on the surface of the sound-absorbing brick, thereby reducing the sound-absorbing performance of the sound-absorbing brick. At the same time, because the conventional sound-absorbing bricks do not have a closed air resonance cavity insid...

Claims

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Application Information

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IPC IPC(8): G10K11/172G10K11/168
Inventor 雷彬阮景文黄盾周以毅张爱明
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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