The multi-bandgap of local effect phononic crystal

A design method of a phononic crystal structure with local effect is introduced, and the mechanism influencing factors (elastic modulus, density, layer thickness) bandgap are analyzed. The finite element used to calculate eigenfrequency. first width accounts for more than 98% frequency below 20 000 Hz. Two kinds materials different wave velocities arranged periodically form two-dimensional structure. Due influence effect, when elastic propagates in layer, propagation will be restrained, eigenfrequency spectrum presents series discrete energy levels. material parameters structural transmission have great on bandgap. an ultra-wide low bandgap, ranges from 238 18857 This periodic has potential application value noise vibration suppression.