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Acoustic construction of 2D phonon crystal

A technology of two-dimensional phononic crystals and cylinders, which is applied in the direction of sound-generating devices and instruments, can solve the problems of narrow material selection range, difficult design and production, and poor adaptability, and achieve strong designability and good sound insulation effect , The effect of simple production process

Inactive Publication Date: 2006-07-05
GUANGDONG UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, this traditional sound insulation technology is not suitable for some occasions, the sound insulation effect is not very ideal, the selection range of materials is relatively narrow, and it is not easy to design and produce sound insulation materials for a specific frequency range.

Method used

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  • Acoustic construction of 2D phonon crystal
  • Acoustic construction of 2D phonon crystal
  • Acoustic construction of 2D phonon crystal

Examples

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Embodiment 1

[0015] Implementation example 1: what this embodiment selects is aluminum alloy (its elastic parameter is: density ρ=2.80×10 3 kg / m 3 , longitudinal wave velocity C l =6.342×10 3 m / s, shear wave velocity C t =1.139×10 3 m / s) Cylinders arranged in an equilateral triangle (attributable to parallelogram) lattice in the air background. figure 1 It is a cross-sectional schematic diagram of the present embodiment, which is composed of two five-layer structural units, and each cylinder is closely arranged, wherein the radius of cylinder 1 is 0.5cm, the radius of cylinder 2 is 6.0cm, and 3 is the diameter of the cylinder. The crystal lattice is arranged, 4 in the cylinder is a hollow part, and 5 is a gap part between the cylinders. The total thickness of the sound insulation structure is about 30.3cm, and the frequency range of the vertically incident sound waves that can be blocked is about 910Hz-60KHz. Such as figure 2 As shown, the labels a and b indicate the frequency rang...

Embodiment 2

[0016] Implementation example 2: After calculation and comparison, it is found that the optimal structure of the two-dimensional phononic crystal (that is, when the band gap is the lowest and the widest) is: the cross-sectional shape of the pillars is square, arranged in a square grid, and the volume fraction ratio of the pillars It is about 80%, and the angle between the orientation of the column and the orientation of the lattice is 26.56°. The present embodiment promptly adopts this optimal structure, and the selected materials are the same as those in Embodiment 1. image 3 It is a cross-sectional schematic diagram of the present embodiment, consisting of two five-layer structural units, wherein the side length of the square cylinder 7 is 0.8cm, the side length of the square cylinder 8 is 5.0cm, and 9 is the arrangement lattice of the cylinder, 10 in the square cylinder is the hollow part, 11 is the gap between the cylinders, 12 represents the width of the bonding part bet...

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Abstract

The invention discloses a 2D phonon crystal sound insulation structure, composed of parallel rigid cylinders arranged in 2D lattice periodical structure in the air; for effectively insulating sound wave, each structural mode at least needs five layers of cylinders; for broadening the frequency range of sound wave band gap, cascading and combining several structures with different lattice constants together. And it has good sound insulating effect, simple making process and strong designability, suitable for wall materials insulating medium- and high- frequency range sound waves or making sound insulation.

Description

technical field [0001] The invention relates to a sound-insulating material structure, in particular to a two-dimensional phonon crystal sound-insulating structure. Background technique [0002] People have made significant progress in the research of photonic crystals. In view of the analogy between phononic crystals and photonic crystals, phononic crystals have gradually become a new research hotspot in the past ten years. An important feature of a phononic crystal is its acoustic bandgap, that is, within the frequency range of the bandgap, elastic waves (acoustic waves) cannot pass through the phononic crystal. This feature makes phononic crystals have broad practical application prospects. For example, we can design and manufacture a brand-new sound and vibration isolation functional material based on this new idea and new theory. Phononic crystal materials are expected to be widely used in environmental protection and construction industries. [0003] Most of the curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/168
Inventor 吴福根钟兰花张欣钟会林李小玲钟韶
Owner GUANGDONG UNIV OF TECH
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