Perforated metamaterial and perforated plate broadband sound absorption and insulation structure

A technology of perforated plates and metamaterials, applied in the direction of sound-producing equipment, instruments, etc., can solve problems such as poor sound absorption performance, and achieve the effects of improved sound insulation performance, good sound absorption performance, and excellent sound insulation performance.

Active Publication Date: 2020-11-10
HARBIN ENG UNIV
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Problems solved by technology

[0005] In order to solve the problem of the poor sound absorption performance of the existing metamaterial structure mentioned in the above background technology in the middle and high frequency bands, the present invention proposes a wide-ban...

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  • Perforated metamaterial and perforated plate broadband sound absorption and insulation structure
  • Perforated metamaterial and perforated plate broadband sound absorption and insulation structure
  • Perforated metamaterial and perforated plate broadband sound absorption and insulation structure

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specific Embodiment approach 1

[0026] Specific implementation mode one: see Figure 1-4 This embodiment will be described. The wide-band sound-absorbing and insulating structure of perforated metamaterial and perforated plate described in this embodiment includes perforated plate 1, mass block 3, film 4, perforated frame 5 and four chamber walls 6, which are surrounded by four chamber walls. A frame wall with a square cross section, a perforated plate 1 is installed at the rear of the frame wall, a perforated frame 5 is installed at the front, and a cavity 2 is formed in the middle, a film 4 is fixed inside the perforated frame 5, and the center of the film 4 A mass block 3 is pasted, the film 4 is a regular hexagon, the mass block 3 is a solid cylindrical structure, and the four corners of the perforated frame 5 are opened with quarter circular holes.

[0027] The perforated plate 1 is square, with a thickness of 0.9mm-2mm, a porosity of 5%-25%, and a perforation diameter of 2-5mm.

[0028] The cavity 2 ...

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Abstract

The invention provides a perforated metamaterial and perforated plate broadband sound absorption and insulation structure. A frame wall with a square section is defined by four cavity walls of the sound absorption and insulation structure, a perforated plate is installed behind the frame wall, a perforated frame is installed in front of the frame wall, a cavity is formed in the middle of the framewall, a thin film is fixed in the perforated frame, and a mass block adheres to the center of the thin film. The thin film is a regular hexagon, the mass block is of a solid cylindrical structure, and quarter round holes are formed in the four corners of the trepanning frame. The perforated metamaterial and perforated plate broadband sound absorption and insulation structure solves the problem that an existing metamaterial structure is poor in sound absorption performance in medium and high frequency bands, when the diameter of a thin film unit changes within a certain range, resonance frequency gradually moves towards the high frequency direction along with increase of the area of a thin film. The composite material shows excellent sound absorption and insulation performance in a full frequency domain, is applied to sound insulation design of ships and other fields, improves the living environment of people, and has a good engineering application prospect.

Description

technical field [0001] The invention relates to a wide-band sound-absorbing and insulating structure with perforated metamaterials and perforated plates, and belongs to the technical field of sound-absorbing and insulating structures. 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 vibration and noise reduction. Developed a series of standards and regulations. [0003] Commonly used sound insulation materials are mainly divided into two categories: porous mate...

Claims

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Application Information

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IPC IPC(8): G10K11/162
CPCG10K11/162
Inventor 靳国永吕东方叶天贵李小波谢祖东
Owner HARBIN ENG UNIV
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