Low-frequency broadband acoustic metamaterial composite sound absorption structure and preparation method

Abstract

The invention discloses a low-frequency broadband acoustic metamaterial composite sound absorption structure and a preparation method. The micro-perforated plate comprises an A-area perforated plate, a B-area perforated plate and a C-area perforated plate; a first channel is defined by a basic cabin, a first partition plate and a second partition plate, a second channel is defined by the basic cabin, the upper side of the first partition plate, the second partition plate, the upper side of a third partition plate and a fourth partition plate, and a third channel is defined by the basic cabin, the lower side of the first partition plate, the lower side of the third partition plate and the fourth partition plate; a first channel inlet is communicated with the A-area perforated plate, a second channel inlet is communicated with the B-area perforated plate, and a third channel inlet is communicated with the C-area perforated plate; the length of the first channel is larger than that of the second channel, the length of the second channel is larger than that of the third channel, and the first channel, the second channel and the third channel are filled with a first channel porous structure, a second channel porous structure and a third channel porous structure respectively. The low-frequency broadband sound absorption device has excellent low-frequency broadband sound absorption performance and is easy to manufacture and install.

Description

technical field [0001] The invention relates to the technical field of vibration and noise control, and more specifically relates to a low-frequency broadband acoustic metamaterial composite sound-absorbing structure and a preparation method. Background technique [0002] With the development and progress of society, modern transport vehicles (automobiles, rail trains, aircraft, ships, manned spacecraft, engineering vehicles, etc.), smart home appliances and high-tech electronics (air conditioners, refrigerators, noise-canceling headphones, etc.), energy The demand for acoustic quality in the fields of construction, construction and human settlements is becoming more and more urgent, so the control requirements for the whole frequency band noise (low, medium and high frequency) are put forward. Medium and high-frequency noises have short wavelengths and weak transmission capabilities, which can be effectively controlled by traditional sound-absorbing material technology; So...

AI Technical Summary

Problems solved by technology

Traditional acoustic metamaterial sound-absorbing structures mainly include film-type acoustic metamaterial structures, Helmholtz resonance-type acoustic metamaterial structures, and labyrinth-type channel-type acoustic metamaterial structures; the design of these structures has many advantages, but there are also some shortcomings. For example: thin-film acoustic metamaterial structures are troublesome to install (usually an additional fixed frame is required), the application of prestress is difficult, and the film is easily damaged and failed by external influences when the film is exposed to the outside; Helmholtz resonance acoustic metamaterial structures The action frequency band is narrow, and although the acoustic metamaterial structure channel of the labyrinth channel can be bent and folded to save depth space, its complex bending makes processing difficult, resulting in increased surface density, increased weight and cost

These defects and deficiencies undoubtedly limit the engineering application of traditional acoustic metamaterial sound-absorbing structures.

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