Analysis of Optimum Parameters for Vibration Bands of Two-dimensional Phononic Crystals

The optimum parameters characteristics of vibration bands for two-dimensional phononic crystal were studied based on the plane wave expansion method, and the XY and Z mode band gap characteristics of square and triangular lattice two-dimensional phononic crystal at silicone rubber carbon diffuser object for aluminum were calculated by numerical methods. The calculation results show that the phononic crystals of triangle structure are more easier to form wide vibration band gap compared with the square structure. By changing the material properties of scatter object,and there are easier to obtain a relatively wide band gap for the large scattering density. These results provide theoretical basis for the design of phononic crystal devices.