Sound absorption and insulation sandwich plate with labyrinth back cavity

Abstract

The invention discloses a sound absorption and insulation sandwich plate with a labyrinth back cavity, and the sound absorption and insulation sandwich plate comprises the labyrinth back cavity. Perforated plates, damping elastic layers and mixed metal plates are in turn symmetrically superimposed on the front side and the back side of the labyrinth back cavity. The labyrinth back cavity is with.The shapes of the labyrinth back cavity, the perforated plates, the damping elastic layers and the mixed metal plates are regular shapes or irregular shapes, and the regular shapes include a circle, an ellipse and a polygon. The labyrinth back cavity, the perforated plates, the damping elastic layers and the mixed metal plates are sealed with damped slurry to prevent leakage, and are connected andfixed together by bolts. Incident sound waves can be reflected multiple times inside a sound insulation layer, the sound insulation quantity can be significantly improved; the resonant cavity can beincreased while increasing of the resonance efficiency, and the sound absorption coefficient is enhanced; the sound absorption frequency band is increased and broadened; and the sound absorption coefficient can be increased while adjusting of the absorption frequency band.

Description

technical field [0001] The invention relates to the technical field of sound-absorbing and insulating sandwich panels, in particular to a labyrinth-type resonant sound-absorbing structure and a variable-density metal sound-insulating panel. Background technique [0002] Noise pollution is the main problem of environmental pollution control. The method of reducing noise is of great significance to sound insulation engineering. From the point of view of the sound insulation mechanism of materials, any material has troughs in the sound wave spectrum blockage, and no matter how heavy the mass of a single-layer material is, there is insufficient sound wave blockage for some frequencies, which restricts the improvement of sound insulation. If two or more sound-absorbing layers with different material properties are used, their respective blocking bands can be avoided. At the same time, when sound waves enter another medium from a single medium, they will be reflected at the inter...

AI Technical Summary

Problems solved by technology

From the point of view of the sound insulation mechanism of materials, any material has a trough in the sound insulation of the sound spectrum. No matter how high the quality of a single-layer material is, it is not enough to block sound waves at some frequencies, which restricts the improvement of sound insulation.

Images