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Thin-film-type active acoustic metamaterial based on magnetic solid coupling

An acoustic metamaterial and film-type technology, applied in the field of acoustic metamaterials, can solve the problems of narrow adjustable range, fixed peak frequency of sound insulation, difficulty in adapting to complex acoustic environments, etc., and achieve simple machining process, fast response and simple structure Effect

Active Publication Date: 2019-04-23
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Once the traditional passive acoustic metamaterials and semi-active acoustic metamaterials are prepared, the peak frequency of sound insulation is fixed, or the adjustable range is narrow, which is difficult to adapt to the actual complex acoustic environment

Method used

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  • Thin-film-type active acoustic metamaterial based on magnetic solid coupling
  • Thin-film-type active acoustic metamaterial based on magnetic solid coupling
  • Thin-film-type active acoustic metamaterial based on magnetic solid coupling

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Embodiment Construction

[0038] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] In this embodiment, the magnets are NdFeB magnets.

[0040] See figure 1 and figure 2 , the first step: place a circular frame on a horizontal table, and place the silicone film naturally on the upper surface of the circular frame on the desktop;

[0041] Step 2: Align another ring frame with the ring frame on the desktop and place it on the silicone film, clamp the silicone film between the two ring frames, and fix the upper and lower ring frames with four screws to fix the silicone film;

[0042] Step 3: Use a utility knife to cut the silicone film along the outer edge of the ring frame;

[0043] Step 4: Glue the S pole side of the NdFeB magnet to the center of the fixed silicone film;

[0044] Step 5: Wrap a layer of sound-proof tape on the outside of the ring frame to prevent sound leakage;

[0045] Step 6: Place t...

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Abstract

The invention relates to the technical field of low-frequency noise actively-controlled acoustic metamaterials, in particular to a thin-film-type active acoustic metamaterial based on magnetic solid coupling. The thin-film-type active acoustic metamaterial is composed of a power-on solenoid, a silicone thin film and other structures, an uniform magnetic field can be generated in the power-on solenoid, and the center of the silicone thin film is additionally provided with a neodymium-iron-boron magnet; after power-on, the magnet on the silicone thin film is subjected to an axial electromagneticforce effect, and non-contact active control over a metamaterial structure acoustic feature is achieved. The metamaterial has good low-frequency sound insulation performance, by changing the currentintensity, magnetic fields different in intensity are generated, the stress applied to the magnet is changed, the inherent frequency of the designed acoustic metamaterial can be quantitatively adjusted, directional movement of the sound insulation peak frequency is achieved, the sound insulation frequency range of the acoustic metamaterial is enlarged, and effective actual application is providedfor noise control in the low-frequency range.

Description

technical field [0001] The invention relates to the technical field of acoustic metamaterials for active control of low-frequency noise, in particular to a thin-film active acoustic metamaterial based on magnetic-solid coupling. technical background [0002] In modern society, noise in the low frequency range not only brings serious safety hazards to instruments and equipment in various fields such as industry, aviation, transportation and railway, but also seriously affects people's daily work and life. The low-frequency sound insulation of traditional materials follows the law of mass. In the existing low-frequency noise control methods, thicker traditional concrete walls or complex composite material structures are used, which are difficult to prepare and expensive. Due to the characteristics of long wavelength, long propagation distance and weak fading, the effective control of low frequency noise has always been a challenging problem in the field of noise control. [0...

Claims

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Application Information

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IPC IPC(8): G10K11/178
CPCG10K11/178
Inventor 吴卫国杭锐曾天成
Owner JIANGSU UNIV
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