The Application of One-dimensional Phononic Crystals to Preventing Low-frequency Noise

作者：Chao Xu, Hu Lifen, Xingcheng Dong, Yingkai Liu · 发表于：Piezoelectrics and Acoustooptics · 年份：2010 · 被引用次数：1 · 研究领域：Acoustic Wave Phenomena Research

The effects of the number of lumped-mass n,lattice constant a,composition ratio n,elastic modulus E and the density ρ on the band gap of the 1-D phonon crystals have been studied by using the lumped-mass method.The results showed that the initial frequency of the band gap and the forbidden bandwidth decreased with the increase of the lattice constant a while increased rapidly with the increase of t (t 1).The initial frequency of the band gap decreased with the increases of both the variances of the elastic modulus E and the density ρ while the cut-off frequency of the band gap kept constant.With the increase of the number of lumped-mass n,the accuracy of the band gap increased.Therefore the composite of phonon crystals are designed to shield the low-frequency noise in the range of 59～557 Hz.