Acoustic supermaterial structure of adjustable double-layer thin film plate based on repulsion force of permanent magnet

Abstract

The invention discloses an acoustic supermaterial structure of an adjustable double-layer thin film plate based on repulsion force of a permanent magnet, and belongs to the field of low frequency anechoic devices. The structure includes a plurality of single cellular structures which are arranged in an array mode, each single cellular structure comprises an upper layer supporting plate structure and a lower layer supporting plate structure, the upper layer supporting plate structure and the lower layer supporting plate structure are fixed through adjustable screw rods, the upper layer supporting plate structure and the lower layer supporting plate structure are both provided with a thin film, and repulsive permanent magnets as bearing loads are arranged at the centers of the thin films. According to the double-layer thin film plate supermaterial, the film prestressing force is changed through the magnetic action of permanent magnet, and the range of adjustable sound insulation band iswidened compared with a film plate structure of an ordinary mass block. By adjusting the distance between the two layers of plates, the magnetic force can be adjusted indirectly, thus, the film tension can be adjusted, the adjustment mode is simple and easy to be achieved, and the structure can play the role of adjustable low frequency silencing in a certain frequency range.

Description

technical field [0001] The invention belongs to the field of low-frequency noise reduction devices, and refers to a device that plays an adjustable low-frequency noise reduction function within a certain frequency range, and specifically refers to an adjustable double-layer film plate acoustic metamaterial structure based on the repulsion of permanent magnets. Background technique [0002] A metamaterial is a composite structure or composite material that is artificially synthesized beyond the physical properties of existing materials in nature, and thus has some peculiar physical properties. The composite structure or composite material is composed of sub-wavelength unit structures, and the important physical scales in these structures play an important role in some of the peculiar physical properties embodied in the material. Thin film acoustic metamaterials can exhibit good sound attenuation performance in the low frequency range. The existing film-type plate structure m...

AI Technical Summary

Problems solved by technology

Its disadvantage is that it can only achieve sound insulation in a narrow frequency range, and it cannot adjust the film prestress

[0003] The film-type metamaterials in the above-mentioned prior art have the technical defect that the sound insulation frequency range is too narrow and the sound insulation frequency cannot be adjusted, which has always been a technical problem to be solved by those skilled in the art.

Images