Local resonance type acoustic metamaterial focusing lens and design method thereof

A technology of acoustic metamaterials and focusing lenses, which is applied in the directions of lenses, optics, and sound-generating devices, can solve the problems of few application occasions, complex design methods, and difficulty in low frequency, and achieve the effect of low cost and simple production and use methods

Pending Publication Date: 2018-11-02
ZHEJIANG UNIV
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These patents provide a new method for acoustic focusing, but have problems suc

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  • Local resonance type acoustic metamaterial focusing lens and design method thereof
  • Local resonance type acoustic metamaterial focusing lens and design method thereof
  • Local resonance type acoustic metamaterial focusing lens and design method thereof

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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted here that: in the drawings or descriptions in the specification, the same part uses the same figure number. Furthermore, while specific parameters are provided in the present disclosure, it is to be understood that the parameters need not be exactly equal to the respective values, but can be approximately equal to the respective values ​​within accepted error margins and design constraints.

[0029] An embodiment of the present invention provides a local resonance type acoustic metamaterial focusing lens, such as figure 1 as shown, figure 1 It is a schematic diagram of the three-dimensional structure of the local resonance acoustic metamaterial focusing lens of the present invention. The focusing lens in...

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Abstract

The invention discloses a local resonance type acoustic metamaterial focusing lens and a design method thereof, which belong to the field of acoustic engineering. The local resonance type acoustic metamaterial focusing lens is an artificial periodic acoustic structure composed of a base body, a plurality of local resonance type scatterer units and a base, wherein the base body material can be airand water, each scatterer unit is in a cruciform shape, the peripheral contour of the periodic array structure formed by the scatter units is in an elliptical shape, and the periodic array structure is arranged on the base. The local resonance type acoustic metamaterial focusing lens and the design method thereof utilize the basic principle of photonic crystal local resonance in combination with anew structural form, so that the acoustic focusing lens disclosed by the invention can achieve good acoustic wave focusing effect in various media and a wide low-and-medium frequency range when compared with the existing acoustic focusing lens.

Description

technical field [0001] The invention relates to a design method of a local resonance type acoustic metamaterial focusing lens, belonging to the field of acoustic engineering. Background technique [0002] Using the principle of phononic crystals to focus sound waves has been a research hotspot since 2000. Phononic crystals are generally artificial periodic structures composed of two or more different media arranged alternately in space. When the sound wave is introduced into the periodic structure, the wave number appears periodically in the Brillouin zone, thus changing the propagation characteristics of the sound wave and producing new features. In the follow-up research, people continue to adjust the propagation of sound waves by adjusting the material parameters of phononic crystals, using defect states or changing the geometry of scatterers to introduce local resonance. These methods have brought new breakthroughs in fields such as vibration and noise reduction, acoust...

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Application Information

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IPC IPC(8): G10K11/30G02B3/12
CPCG10K11/30G02B3/12
Inventor 梁旭阮永都王立忠王玉红王体涛邓禹
Owner ZHEJIANG UNIV
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