A membrane-type acoustic metamaterial sound-absorbing and insulating device with perforated plates

Abstract

The invention provides a membrane-type acoustic metamaterial sound absorption and insulation device with perforated plates. The four cavity walls of the sound insulation device are enclosed into a frame wall with a square cross-section. The rear of the frame wall is installed with a perforated plate and the front is installed with The opening frame has a cavity formed in the middle, a film is fixed in the opening frame, a mass block is pasted in the center of the film, the film is circular, and the mass block is a solid cylindrical structure. To solve the problem that the existing thin-film acoustic metamaterials have limited effect on the sound wave in the mid-frequency range, a perforated plate with a perforated plate or a single-membrane acoustic metamaterial with a narrow sound absorption frequency band that is suitable for use in a wide frequency range is proposed. The membrane-type acoustic metamaterial sound absorption and insulation device is used in the design of sound absorption and insulation in ships and other fields to improve people's living environment, and has good engineering application prospects.

Description

technical field [0001] The invention relates to a membrane-type acoustic metamaterial sound absorbing and insulating device with perforated plates, belonging to the technical field of sound absorbing and insulating devices. Background technique [0002] With the rapid development of modern industry and transportation, and people's increasing awareness of environmental protection, noise pollution has become one of the three major pollution problems facing human beings, just like air pollution and water pollution. At present, the noise problem has been listed as a "new urban public hazard". In order to better control the environmental noise pollution problem and improve people's living and working environment, countries around the world have invested a lot of manpower and material resources in vibration reduction and noise reduction. A series of standards and regulations have been formulated. [0003] In recent years, based on the development of traditional structure and mate...

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Problems solved by technology

[0004] In order to solve the problem that the existing film-type acoustic metamaterials mentioned in the above-mentioned background technology have limited effects on the sound waves in the mid-frequency range, the present invention proposes a single perforated plate or a single membrane-type acoustic metamaterial with a narrow sound-absorbing frequency band, which is suitable for The membrane-type acoustic metamaterial sound-absorbing and insulating device with a perforated plate used in a wide frequency range is used in the sound-absorbing and insulating design of ships and other fields to improve people's living environment and has a good engineering application prospect

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