Study on Band Gap Characteristics of Phononic Crystal Composed by Different Material

Band gap of characteristics of phononic crystal composed by different material were studied based on the plane wave expansion method.XY mode band structure of square phononic crystal made from carbon diffuser object and different substrate materials were obtained by numerical simulation; XY mode band structure of square phononic crystal made from epoxy matrix and different carbon diffuse object were also given,and Z mode band structure of square and triangle phononic crystal were obtained.These results show that band gap is more likely to be obtained by increasing density ratio of scatterer and steel object; triangle structure compared with the square structure are more easier to form wide band gap.These results provide theoretical basis for the design of phononic crystal devices.