A Periodic Coating Structure of Phononic Crystal with Local Resonance
A technology of phononic crystals and periodic coatings, applied in the direction of sound-generating devices, instruments, etc., can solve the problems of limited application, narrow band gap width, non-compliance, etc., and achieve the effect of good local resonance characteristics
Active Publication Date: 2020-03-06
WENZHOU UNIV
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Problems solved by technology
At present, the bandgap frequency of phononic crystals is often high and the bandgap width is narrow, but the low-frequency wide-bandgap requirements for engineering applications do not meet the requirements, which seriously limits its application in the field of vibration and noise reduction.
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Embodiment Construction
[0024] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings:
[0025] The technical problem to be solved by the present invention is to provide a local resonance type phononic crystal periodic coating structure to obtain a low frequency wide band gap.
[0026] In order to solve the above-mentioned technical problems, the present invention adopts a technical scheme including first designing a local resonance type phononic crystal periodic coating structure arranged in the form of a square lattice, and then using the finite element method to calculate the band gap of this phononic crystal structure. And the transmission spectrum, analyze the influencing factors of the local resonance characteristics, and finally give the thickness of the coating and the radius of the cylindrical scatterer to adjust the start and cut-off frequencies of the band gap, so as to achieve the desired band gap width. Suitable for engineering ...
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Abstract
The invention belongs to the field of structural design of acoustic functional materials, in particular to a local resonance type phonon crystal periodic coating structure. A periodic coating structure of local resonance phononic crystals arranged in the form of a square lattice is proposed. The unit cell of the structure is based on epoxy resin and lead is used as a cylindrical scatterer, which is wrapped by a ring coating. The annular coating contains any number of cylindrical holes, each of which separates the intact coating into two parts, aluminum and polymer. The band gap and transmission spectrum of this phononic crystal structure are calculated by finite element method, and the influencing factors of local resonance characteristics are analyzed. Finally, a periodic coating structure of phononic crystal with local resonance is proposed. The phonon crystal periodic coating structure of the present invention has good local resonance characteristics, and can obtain low-frequency wide bandgap, so that the phonon crystal structure can be better applied in the engineering field.
Description
technical field [0001] The invention belongs to the field of acoustic functional material structure design, in particular to a local resonance type phononic crystal periodic coating structure. Background technique [0002] Phononic crystals have great application prospects in vibration control and noise isolation due to their elastic band gap characteristics. At present, the band gap frequency of phononic crystals is often high and the band gap width is narrow, but it does not meet the low frequency wide band gap requirements for engineering applications, which severely limits its application in the field of vibration and noise reduction. How to obtain the phononic crystal structure with tunable low frequency and wide band gap will be particularly important. [0003] In recent years, scholars at home and abroad have done a lot of research on the pursuit of low-frequency wide-bandgap phononic crystal structures. For example, in the aspect of two-dimensional phononic crystal...
Claims
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IPC IPC(8): G10K11/172C08L63/00
CPCC08L63/00G10K11/172
Inventor 向家伟刘帽钟永腾
Owner WENZHOU UNIV