The Experimental Study On Band Gap Structure Of Two-Dimensional Phononic Crystals

This paper summarized the status in researches and application perspectives of phononiccrystal, introduced the basic knowledge and properties of phononic crystal, and perpetratedthe model, which could be measured in two dimensions, to research the band-gap structure ofphononic crystal about two-dimensional steel pipe/air system.The eigenvalue equation of two-dimensional phononic crystal is deduced by plane waveexpansion method. Then computational programs are compiled to solve the eigenvalueequations of two-dimensional phononic crystal, so that the energy band structures of differentparameters can be gained. For the especially sound wave in the direction of ΓX, theinsert loss of different rectangle lattice structure can be gained through the experimentaltest, discussed the center frequency and width of band gap about different parameter,summarized the band gap rule on the direction ofΓX, which is the main direction tobring band gap, the center frequency and width of band gap are mostly influenced by theportrait parameter, make the center frequency increase and the width of band get wider.The results between theory calculation and experiment match well, which proves thevalidity of the plane wave method.