Folded beam type sonic crystal with wide amplitude and low frequency band gap characteristics

Abstract

The invention discloses a folded beam type sonic crystal with wide amplitude and low frequency band gap characteristics. The folded beam type sonic crystal comprises multiple primitive cells, whereinmultiple primitive cells are distributed in a three-dimensional cube array and form the sonic crystal; each primitive cell comprises 12 borders, the 12 borders are connected to form a cubic frame structure, each border comprises two folded beams and mass blocks, first ends of the two folded beams are respectively fixedly connected with the outer side surface of the mass blocks, and axes of the twofolded beams are coincided and pass through the center of the mass blocks. The folded beam type sonic crystal with the wide amplitude and low frequency band gap characteristics has the advantages that the mass blocks are connected by virtue of the folded beams, connection stiffness among the mass blocks is reduced, based on a local resonance mechanism, an energy band gap can beneficially move tolow frequency, and a wider energy band gap is formed.

Description

technical field [0001] The invention relates to the field of phononic crystal design, in particular to a folded-beam phononic crystal with wide-width low-frequency bandgap characteristics. Background technique [0002] Phononic crystals refer to materials or structures with different acoustic properties that are periodically compounded together and have a periodic composite material or structure with an acoustic band gap. When the acoustic wave or vibration excitation is periodically modulated by materials or structures, a bandgap may occur, that is, the propagation of sound waves or vibrations in a certain frequency range is suppressed or forbidden. This characteristic of phononic crystals has important engineering application value, and has broad application prospects in the design of new functional materials such as vibration reduction and noise reduction, passive sound insulation, and acoustic filters. [0003] The size of the bandgap of the phononic crystal and its fre...

AI Technical Summary

Problems solved by technology

However, judging from the current research, the energy bandgap frequency band of the phononic crystal structure obtained by the current research is narrow and mostly in the middle and high frequency bands, which is still difficult to meet the actual engineering needs, and also limits the further engineering application of phononic crystals.

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