A low-frequency noise bionic acoustic metamaterial and its preparation method
An acoustic metamaterial and low-frequency noise technology, applied in the direction of sound-generating devices and instruments, can solve the problems of low strength, easy damage, poor vibration reduction effect, etc., and achieve the effect of wide application range and easy installation
Active Publication Date: 2020-09-01
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0003] In view of this, the present invention provides a low-frequency noise bionic acoustic metamaterial and its preparation method, which can effectively solve the common technical problems of existing acoustic metamaterials, such as poor vibration damping effect, low strength and easy damage
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[0030] Embodiments of the present invention provide a low-frequency noise bionic acoustic metamaterial and a preparation method thereof, which can effectively solve the technical problems of poor vibration damping effect, low strength and easy damage of existing acoustic metamaterial cloth sheets.
[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below, obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] see figure 1 and figure 2 , the embodiment of the present invention provides a low-frequency noise bionic acoustic metamaterial, including a rigid rectangular frame 1, a transverse flexible ligament 3, a longitudinal flex...
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The invention belongs to the technical field of noise reduction materials, and in particular relates to a low frequency noise bionic acoustic metamaterial and a preparation method thereof. The low frequency noise bionic acoustic metamaterial provided by the invention comprises a rigid rectangular frame, a transverse flexible ligament, a longitudinal flexible ligament and an oblique flexible ligament, wherein the rigid rectangular frame comprises a plurality of cells; each cell is provided with the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament through hinges; and resonators are arranged on the flexible ligaments at an equal interval. The present invention further provides a preparation method of a low frequency noise bionic acoustic metamaterial. The preparation method comprises the steps of: dividing the rigid rectangular frame into the plurality of cells; installing the transverse flexible ligament, the longitudinal flexible ligament and the oblique flexible ligament on the rigid rectangular frame in each cell through hinges; and connecting the ring resonators through the hinges on the flexible ligaments. The technical problemsare effectively solved that the existing acoustic metamaterials generally have the poor vibration damping effect and the low strength and easy breakage.
Description
technical field [0001] The invention belongs to the technical field of noise reduction materials, and in particular relates to a low-frequency noise bionic acoustic metamaterial and a preparation method thereof. Background technique [0002] Acoustic metamaterials are materials that can control large-wavelength sound waves through millimeter-scale structures, and have broad prospects for low-frequency noise control. In 2000, Liu Zhengyou and others introduced a local resonance unit at low frequencies, which can absorb the energy transmitted by low-frequency sound waves and generate low-frequency forbidden bands. In 2008, Yang et al. fixed a mass block on a circular elastic film and fixed the film on the skeleton to achieve a band gap of 200-300Hz. Chinese patent 201210490610.5 proposes a two-dimensional two-component film-type dark acoustic metamaterial with local resonance characteristics, which can absorb low-frequency sound waves in a wide range. Chinese patent 20131051...
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IPC IPC(8): G10K11/172G10K11/162
CPCG10K11/162G10K11/172
Inventor 李丽彭磊樊小鹏唐念邹庄磊
Owner GUANGDONG POWER GRID CO LTD