Sound absorbing device used for U-beam composite structure of light rail

Abstract

The invention relates to the field of light-rail sound absorption, in particular to a sound absorbing device used for the U-beam composite structure of the light rail. The sound absorbing device comprises a sound absorbing device body, the sound absorbing device body is composed of a microporous plate, tin foil, sound absorbing cotton, a cavity and a bottom plate from outside to inside, the surface of the microporous plate is provided with micropores spaced, the tin foil is closely attached above the sound absorbing cotton, spaced projections are arranged on the bottom plate, and the height of the projections is identical with the height of the cavity. The sound absorbing device is of composite structure, the microporous plate is an aluminum alloy pore plate or an inorganic pore plate, the bottom plate is molded by PVC (polyvinyl chloride) alloy materials by a vacuum casting process. The sound absorbing device is filled with the sound absorbing cotton (with noise reduction coefficient larger than or equal to 0.88), and is specially designed from the aspects of flow resistance of an acoustic panel absorber, porosity, structure factor, thickness, density, surface material treatment and mounting, advantages of various single materials can be sufficiently given into play, high, medium and low frequency broad-spectrum noise is reduced, and the sound absorbing device has the advantages of simplicity, convenience, attractive appearance and practicality.

Description

technical field [0001] The invention relates to the field of light rail noise reduction, and relates to a sound absorption device for a light rail U-shaped beam composite structure. It can effectively reduce the radiation of track noise, and at the same time, it can be used as a guard plate for light rail U-beam cable trays, which plays a very good role in the overall noise reduction of rail transit. Background technique [0002] With the rapid development of my country's economy and the rapid advancement of industrialization and urbanization. In recent years, the number of railways, highways, subways and urban light rails has increased day by day. While it is convenient for people to travel, it has become the fourth largest pollution after air pollution, water pollution and solid waste pollution. Therefore, the problem of noise pollution control has become become urgent social problems. At present, the noise generated in traffic facilities is the most important thing. Th...

AI Technical Summary

Problems solved by technology

Although its noise reduction effect is better, it is no different from the existing noise reduction barrier, and still has the above-mentioned defects of the sound barrier.

When in use, it is greatly affected by the wind of the train, and the eccentricity of its installation is large, and the installation is not firm, resulting in unsafe factors

Images