A design method for cement-based sound-absorbing metal sound barrier unit panels

Abstract

The invention provides a design method of a cement-based sound-absorbing metal sound barrier unit panel, wherein the cement-based sound-absorbing metal sound barrier unit panel includes a porous sound-absorbing layer, a perforated sound-insulating layer and a rear air layer arranged along the propagation direction of the sound source. layer, wherein the perforated sound insulation layer includes the following design steps: S1: preset perforation radius of the perforated sound insulation layer r ;S2: at the preset perforation radius r S3: Determine the weighted sound insulation under the perforation rate R c ; S4: Judging according to the judgment condition Rc ≥ the design standard limit value. The invention can realize the co-optimization of the sound absorption and sound insulation performance of the structural design of the cement-based sound absorption material.

Description

technical field [0001] The invention belongs to the technical field of metal sound-absorbing sound-absorbing panels, in particular to a cement-based sound-absorbing metal sound-absorbing unit panel with excellent low-frequency sound-absorbing performance and a design method thereof. Background technique [0002] Metal sound barriers are widely used in the prevention and control of outdoor noise such as highways, railways, and site construction. The cavity formed by the metal shell and the sound-absorbing material embedded in it form a unit board, which is the core acoustic component of the sound barrier. At present, the sound-absorbing materials used in metal sound barriers are mainly inorganic fiber-based sound-absorbing materials, but the performance of such materials decreases after being exposed to moisture, and the texture is soft, brittle and easy to break, which is prone to dust pollution. Cement-based sound-absorbing materials with lightweight inorganic materials su...

AI Technical Summary

Problems solved by technology

In the structural design of cement-based sound-absorbing materials, the two performance indicators are often not balanced, and it is difficult to obtain the joint optimization of sound absorption and sound insulation performance

In addition, the existing structural design methods of acoustic components have a large lag. Often, after the design is completed according to the requirements of one performance index (such as sound absorption coefficient), another performance index (such as insulation coefficient) is verified by actual measurement or evaluation methods. Acoustic performance), if another performance index does not meet the design requirements, it needs to be reworked and redesigned, which greatly reduces the efficiency of structural design

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