Low-frequency broadband flat plate sound absorption structure

Abstract

The invention discloses a low-frequency broadband flat plate sound absorption structure, which comprises a frame, a front panel and a rear back plate which are fixedly arranged on the upper side and the lower side of the frame, and a sound absorber which is defined by the frame, the front panel and the rear back plate and used for absorbing low-frequency noise; a plurality of sound absorption holes are formed in the front panel, one sides of the sound absorption holes face the sound source, and the other side is connected with the sound absorber. The sound absorber consists of a plurality of clapboards arranged in the frame in parallel, one ends of the clapboards are fixed with the inner wall of one side of the frame, and the other ends are in clearance fit with the inner wall of the other side of the frame; the partition plates divide the space in the frame into serpentine channels, frame inner walls used for separation are arranged on the channels, and the channels between the adjacent frame inner walls form MIE type resonant cavities. The low-frequency broadband flat plate sound absorption structure is compact in structure, light in weight, small in surface density, wide in low-frequency sound absorption frequency band and good in low-frequency sound absorption performance.

Description

technical field [0001] The invention relates to a sound-absorbing structure, in particular to a low-frequency broadband flat-plate sound-absorbing structure. Background technique [0002] With the development of modern society, the quality of life is constantly improving, and environmental problems, especially noise problems, are becoming more and more serious. In recent years, my country's transportation facilities have been gradually improved, transportation has developed rapidly, the impact of environmental noise has become increasingly larger, and the problem of traffic noise has become increasingly prominent. The control of noise pollution has become an urgent problem to be solved worldwide. Expressways, underground railways, high-speed railways and air transportation are the symbols of urban modernization, but the noise problem of modern vehicles during high-speed driving has always affected people's normal work, study and rest. Because the passing noise has the chara...

AI Technical Summary

Problems solved by technology

The traditional sound insulation barrier is generally a combination structure of double-layer steel plates with porous sound-absorbing materials. This technical solution has poor low-frequency sound absorption effect, and the overall sound insulation performance is average.

The new low-frequency sound-absorbing structure usually adopts the combined sound-absorbing mechanism of local resonance and porous materials, which has a certain absorption effect on low-frequency pass-by noise, but its structure thickness is relatively large, the low-frequency sound-absorbing performance is average, and the application range is narrow

For example, the Chinese patent with the publication number CN1512482 discloses a sound-absorbing material and its manufacturing method and application. The principle of sound absorption is the same as that of micro-perforated plates, and its sound absorption performance is similar to that of micro-perforated plates, so its sound absorption bandwidth is narrower, and its low-frequency sound absorption performance is poor

The Chinese patent with the publication number CN1219989A discloses a track noise control device, which includes a sound-absorbing panel installed on the rails of the track, which is supported on the rails by elastic elements and self-supporting across the space between the rails; the technical solution Through the joint action of the noise reduction resonator and the porous light building material particles, the passing noise from the train is absorbed, but limited by the height of the rail, the thickness of the structure is thin, and the volume of the noise reduction resonator is small, so its low-frequency sound absorption poor performance

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