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Sound insulation band gap material with two-dimensional serial structure

A series structure, vocal bandgap technology, applied in the direction of sound-generating devices, instruments, etc., can solve the problem of narrow frequency range

Inactive Publication Date: 2010-08-04
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, most of the literature reports at home and abroad on the sound insulation of two-dimensional acoustic bandgap materials mainly focus on square lattice, triangular lattice and honeycomb lattice, but their frequency range is very narrow.

Method used

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  • Sound insulation band gap material with two-dimensional serial structure
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  • Sound insulation band gap material with two-dimensional serial structure

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Embodiment Construction

[0016] see figure 1 , a schematic diagram of a two-dimensional circular tube / air acoustic bandgap material, Figure (a) is a square lattice, the angle between the Γ-X and Γ-M directions of the first Brillouin zone is 45°; Figure (b) is a triangular lattice , the angle between the Γ-M and Γ-K directions of the first Brillouin zone is 30°; Figure (c) is a honeycomb lattice, and the angle between the Γ-K and Γ-M directions of the first Brillouin zone is 30° °;

[0017] see figure 2 , The diameter of the stainless steel tube in the square lattice, triangular lattice and honeycomb lattice acoustic band gap material is 80mm, the wall thickness is 2mm, and the distance between the centers of adjacent stainless steel tubes is 85mm. The density and wave velocity of the stainless steel tube are 7.89×103kg / m3 and 5780m / s respectively, the density and wave velocity of the air are 1.29kg / m3 and 340m / s respectively, and the filling rates of these three lattices are 69.57% and 80.33% respe...

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Abstract

The invention relates to a sound insulation band gap material with a two-dimensional serial structure, belonging to the field of acoustics and relating to the fields of condensed matter physics, mechanics, machinery, materials science, and the like. The structure is formed by respectively arraying and serially connecting parallel pipes (solid pipes, hollow metallic pipes or non-metallic pipes) in air according to tetragonal lattices, triangular lattices and honeycomb lattices. The sound insulation band gap material with a two-dimensional serial structure is characterized in that the tetragonal lattices in a gamma-X direction at least include three layers, and the triangular lattices and the honeycomb lattices in a gamma-M direction at least include four layers; the arraying sequences of the three lattices have no relations, and the gamma-X direction of the tetragonal lattices and the gamma-M direction of the triangular lattices and the honeycomb lattices are parallel to the same straight line; and sound waves are transmitted along the gamma-X direction and the gamma-M direction in the serial structure. The sound insulation band gap material with a two-dimensional serial structure can better suppress environmental noise within a frequency range of 1-3kHz which is the most sensitive to the human ears, thereby being used for sound barrier and having wide engineering application potential in reducing the noise of highways, railways, urban traffics and rooms.

Description

technical field [0001] The sound-insulating acoustic bandgap material with a two-dimensional series structure of the invention belongs to the field of acoustics, and involves the fields of condensed matter physics, mechanics, machinery, materials science and the like. Background technique [0002] As we all know, noise pollution has an important impact on people's health. It mainly comes from outdoor noise from factories, aviation, railway transportation, highways, and urban traffic, and indoor noise from fans, computers, and air conditioners. Traditional noise suppression uses dense, airtight sound barriers to bypass the sound wave diffraction, which can avoid interference to people, but the wind speed and atmospheric turbulence in the air also affect the performance of the sound barrier. [0003] In recent years, many scholars have developed a strong interest in the research of artificial periodic structure acoustic band-gap materials (Acoustic band-gap materials). This ma...

Claims

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Application Information

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IPC IPC(8): G10K11/162
Inventor 何存富赵寰宇吴斌魏瑞菊
Owner BEIJING UNIV OF TECH
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