A thin-film and thin-plate acoustic metamaterial sound insulation device

Abstract

The invention discloses a film and sheet type acoustic metamaterial sound arrester. The film and sheet type acoustic metamaterial sound arrester is formed through lamination of cellular structures with different thicknesses and radii. Each cellular structure comprises a concentrated mass block, a film and a framework, wherein the periphery of the film is fixed to the framework, the concentrated mass block tightly adheres to the film, and the film only needs to be flattened and does not need to be tensioned. The cellular structures are closely and periodically distributed to form the slabby sound arrester. The film and sheet type acoustic metamaterial sound arrester is good in sound insulation effect, large in bandwidth and high in sound reduction index, and control of the mass law over the sound reduction index is effectively broken. Furthermore, the structure is highly adjustable, and a sound arrester with the sound reduction index higher than the mass law below 2000 Hz can be obtained through lamination of different structures.

Description

technical field [0001] The invention relates to the fields of machinery and noise control, in particular to a thin-film thin-plate type acoustic metamaterial sound insulation device. Background technique [0002] Acoustic metamaterials are artificially engineered materials that have been extensively investigated over the past few years, primarily because they are promising, are difficult or impossible to find in nature, and possess special properties not found in natural materials. Attributes. As such, they open the door to improvements and even entirely new applications. The acoustic material with local resonant bandgap reported in 2000 is the predecessor of acoustic metamaterial and the earliest realized acoustic metamaterial. Acoustic metamaterials have negative mass density and elastic modulus. Thin-film acoustic metamaterial is a new type of acoustic metamaterial that has received extensive attention in recent years. It consists of a rigid frame, a tensioned rubber m...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the technical problems in the prior art, such as the difficulty of noise reduction, the volume of the sound insulation device is too large, the working frequency is single, and the film has a large dependence on tension, etc., to provide a light weight, thin thickness, wide frequency, high insulation Sound volume, easy to manufacture and no need to apply tension plate sound insulation device, in order to achieve the above purpose, the present invention adopts the following technical solutions:

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