Research on band gap characteristics and regulation method of new two-dimensional phonon crystals
In order to widen the band gap of phonon crystal elastic wave,a phonon crystal structure model with symmetry on both sides of the substrate is proposed.The energy band structure and intrinsic mode of the phonon crystal are calculated by finite element method.Based on the local resonance mechanism,the formation mechanism of the band gap is deeply analyzed.The band gap of the phonon crystal is passively and actively regulated by changing geometric parameters and applying isometric pre-tension strain.The simulation results show that a local resonance band gap is generated by the coupling of long-wave traveling wave and resonance of the oscillator in the phonon crystal structure substrate.A wider frequency band gap with lower initial frequency can be obtained by optimizing geometric parameters.The band gap can be effectively broadened by applying isometric pre-tension strain to the structure and the band gap width increases with the increase of the pre-tension strain.The research results provide a scheme for active band gap regulation of phonon crystals as well as a new idea for structure vibration and noise reduction.
phonon crystalsband gap characteristicsband gap regulationpre-tension strain
万方数据
维普
