Defect-state structure acoustic metamaterial plate

Abstract

The invention discloses a defect-state structure acoustic metamaterial plate. The defect-state structure acoustic metamaterial plate comprises an elastic film, two composite plates and a plurality of mass sheets; the two composite plates are bonded to the upper side and the lower side of the elastic film respectively; openings which are periodically distributed are formed in the composite plates; the plurality of mass sheets, corresponding to the openings, are arranged on the elastic film; and the mass sheets are of a defect-state structure in distribution. The defect-state structure acoustic metamaterial plate provided by the invention has the advantages of simple structure and excellent design. According to the defect-state structure acoustic metamaterial plate, used basic materials are conventional materials, and therefore, batched processing and production of the defect-state structure acoustic metamaterial plate can be achieved with easiness, and the defect-state structure acoustic metamaterial plate is worth popularizing in the industry.

Description

technical field [0001] The invention belongs to the technical field of acoustic metamaterials, and in particular relates to a structural acoustic metamaterial plate in a defect state. Background technique [0002] Vibration exists widely in nature, and most vibration sources in the actual living environment are distributed in the low-frequency range below 250Hz. Low-frequency vibration and noise in this frequency range have slow energy attenuation, long propagation distance, and penetrating ability. Strong characteristics, difficult to control and block, have produced great harm to industrial production and human body. In engineering, sound insulation materials and damping materials are often used to reduce low frequency vibration and noise. When traditional sound insulation materials need to isolate sound waves and vibrations, the thickness of the sound insulation material components generally needs to match the wavelength of the sound waves. If you want to isolate sound w...

AI Technical Summary

Problems solved by technology

When traditional sound insulation materials need to isolate sound waves and vibrations, the thickness of the sound insulation material components generally needs to match the wavelength of the sound waves. If you want to isolate sound waves below 100 Hz, you need sound insulation materials with a thickness of more than 1m. It is obviously unrealistic in equipment with compact internal space such as airplanes; damping materials can reduce low-frequency vibration and noise to a certain extent, but with the continuous enhancement of lightweight, economical, and environmental protection requirements, the quality of damping materials is limited. It is also becoming more and more stringent, and traditional damping materials cannot meet the needs of low-frequency vibration and noise reduction; therefore, it is urgent to develop new low-frequency vibration and noise reduction materials

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