Multi-layer film type acoustic meta-material structure and design method thereof

Abstract

The invention discloses a multi-layer film type acoustic meta-material structure and a design method thereof. The meta-material structure comprises a plurality of stacked film type acoustic meta-material units with different structural parameters, and each meta-material unit is divided by a hard frame to form the wide-frequency-band low-frequency sound insulation structure with a plurality of sound insulation peaks. The method comprises the following steps: calculating the sound insulation peak frequency of a meta-material unit; and according to the sound insulation peak frequency, constructing the acoustic meta-material structure in one form of equal spacing, peak value and valley value complementing and noise source customization. The structure can be applied to various vehicles and building decoration, and a brand new noise reduction method is provided for creating a low-noise environment.

Description

technical field [0001] The invention relates to the research field of acoustic metamaterials, in particular to a multilayer thin-film acoustic metamaterial structure and a design method thereof. Background technique [0002] There are serious noise problems in many places in our life. Whether it is in the fields of transportation such as automobiles, subways, and aviation, or in the field of life such as architectural decoration, the troubles caused by noise are becoming more and more serious. The sound insulation walls on both sides of expressways and subway tracks, the sound insulation materials of KTV boxes, and the front wall of cars, carpet sound insulation pads, etc., can attenuate the transmission of noise to a certain extent, but they cannot effectively isolate low-frequency noise. Solving the problem of low-frequency noise has always been a very difficult challenge. Low-frequency noise has a long wavelength and strong penetrating ability. The sound insulation perfor...

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Problems solved by technology

[0006] In order to improve the shortcomings of metamaterials, the present invention proposes a multi-layer thin-film acoustic metamaterial structure design method based on the calculation of sound insulation peak frequency, wherein each layer of thin film and mass block is an acoustic metamaterial unit, based on the metamaterial Calculation of the sound insulation peak frequency, designing the structural parameters of each metamaterial to precisely control its sound insulation peak frequency, superimposing the designed metamaterial units together to form a wide-band low-frequency sound insulation with multiple sound insulation peaks The structure, in which the sound insulation peaks can be designed to be equidistant, peak and valley complementary and customized based on the noise source, makes up for the shortcomings of a single metamaterial in the sound insulation valley of low sound insulation and narrow sound insulation frequency band. Application prospects

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