Membrane type acoustic metamaterial sound absorption and insulation device with perforated plate

Abstract

The invention provides a membrane type acoustic metamaterial sound absorption and insulation device with a perforated plate, which is characterized in that four cavity walls of the sound absorption and insulation device enclose a frame wall with a square section, the perforated plate is arranged behind the frame wall, a perforated frame is arranged in front of the frame wall, a cavity is formed inthe middle of the frame wall, a film is fixed in the perforated frame, a mass block is adhered to the center of the film, and the film is circular, and the mass block is of a solid cylindrical structure. The membrane type acoustic metamaterial sound absorption and insulation device with the perforated plate solves the problem that an existing membrane type acoustic metamaterial is limited in sound wave effect on a medium frequency band, solves the problem that a single perforated plate or a single membrane type acoustic metamaterial is narrow in sound absorption frequency band, is suitable for being used in a wide frequency band range, and is applied to sound absorption and insulation design of ships and other fields. The living environment of people is improved, and the engineering application prospect is good.

Description

technical field [0001] The invention relates to a membrane type acoustic metamaterial sound absorption and insulation device with a perforated plate, belonging to the technical field of sound absorption and insulation devices. Background technique [0002] With the rapid development of modern industry and transportation, as well as people's increasing awareness of environmental protection, noise pollution has become one of the three major pollution problems facing mankind, 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 environmental noise pollution and improve people's living and working environments, countries all over the world have invested a lot of manpower and material resources in reducing vibration and noise. Developed a series of standards and regulations. [0003] In recent years, on the basis of the development of traditional structure and material science, peopl...

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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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