A Triangular Crystal Domain Resonant Phononic Crystal Structure
A technology of phononic crystals and triangular crystals, which is applied in the field of triangular crystal domain resonance phononic crystal structures, can solve problems such as difficult application in the engineering field, difficult low-frequency band gap, etc., and achieve good local resonance characteristics.
Active Publication Date: 2022-06-24
WENZHOU UNIV
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Problems solved by technology
In the early stage of phononic crystal research, the mechanism of periodic structure bandgap in phononic crystals is mainly the Bragg scattering mechanism, in which the structural periodicity plays a leading role, and it is difficult to obtain low-frequency bandgap below 1kHz under the condition of small period size. As a result, it is difficult to have practical application in the field of engineering
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[0032] The present invention will be further described in detail below with reference to the accompanying drawings.
[0033] as attached figure 1 , figure 2 , image 3 and Figure 4 As shown, a triangular crystal lattice domain resonance type phononic crystal structure includes a body, and the body is composed of a plurality of rhombic unit cell structures with the same structure regularly arranged;
[0034] Each rhombus unit cell structure includes a rhombus frame 1 , a rectangular scatterer 2 , two sets of first elastic beams 3 and two sets of second elastic beams 4 , and the rectangular scatterer 2 is embedded in the rhombus frame 1 . In the middle, two groups of first elastic beams 3 and two groups of second elastic beams 4 are used as connecting structures between the rectangular scatterer 2 and the rhombus frame 1, and are staggered and spaced around the center of the rectangular scatterer 2;
[0035] Each of the first elastic beams 3 includes a first straight secti...
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The invention discloses a triangular lattice domain resonance type phonon crystal structure, which includes a body, and the body is composed of a plurality of rhombic unit cell structures with identical structures arranged regularly; each rhombic unit cell structure includes a rhombic outer frame, a rectangular scatterer, two sets of first elastic beams and two sets of second elastic beams, the rectangular scatterer is embedded in the middle of the diamond-shaped outer frame, two sets of first elastic beams and two sets of second elastic beams are used as The connection structure between the rectangular scatterer and the rhombus outer frame is staggered and arranged at intervals around the center of the rectangular scatterer; the materials of the rhombus outer frame, the first elastic beam and the second elastic beam are all epoxy resin, and the The material of the body is steel. The present invention has the following advantages and effects: the triangular lattice phononic crystal structure of the present invention has good local resonance characteristics, and can obtain a low-frequency wide band gap through geometric parameter adjustment, so that the phononic crystal structure can be better applied to the engineering field .
Description
technical field [0001] The invention relates to the technical field of phononic crystals, in particular to a triangular crystal lattice domain resonance type phononic crystal structure. Background technique [0002] As a new artificial structure with spatial periodicity and exhibiting elastic wave band gap characteristics, phononic crystals have attractive application prospects in vibration control and noise isolation due to their unique physical properties. At present, most phononic crystals tend to have high band gap frequencies and narrow band gaps, which do not meet the low-frequency band gap requirements for engineering applications, which severely limits their applications in the field of vibration and noise reduction. How to obtain a phononic crystal structure with tunable low-bandwidth band gap will be particularly important. [0003] In recent years, phononic crystals, as a new type of acoustic functional materials, can suppress the diffusion of noise and vibration...
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IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 向家伟马幸福
Owner WENZHOU UNIV