Research on Vibration Band Gaps of Phononic Crystals Consisting of Scattering Cells

The elastic material with a rigid core is called scatter-unit in this paper. Phononic crystal is a composite consisting of scatter-units arranged in certain arrays. Finite element method was employed in the calculations of the transmission properties of vibration through one and three-dimensional phononic crystals. The results are in good agreements. Therefore the research on vibration band gaps of three-dimensional phononic crystals can be simplified to the study of one-dimensional ones. The influences of the number of layers and core properties upon vibration band gaps of one-dimensional phononic crystals were also discussed. The observations from the vibration experiments are reasonably consistent with the calculated results.