Study on the bandgaps of two-dimensional vacuum/solid phononic crystals with Helmholtz resonators

摘要

In this paper, we present a type of vacuum/solid phononic crystal composed of two-dimensional Helmholtz resonators, which is called Helmholtz resonant phononic crystals. By using the finite element method, bandgaps and vibration modes are studied. The numerical computation is performed by Comsol Multiphysics 3.5a. The results show that complete resonant bandgaps exist for the Helmholtz resonant phononic crystals, and also a lower full bandgap appears for the mixed mode. The results are related to optimization of the acoustic bandgaps.