Abstract
A novel phononic crystals (PnCs) structure that comprises periodically arranged hollow pillars filled with magnetorheological fluid (MRF) is fabricated by three-dimensional printing. The dispersion relations and transmission characteristics of the PnCs filled with MRF are numerically calculated using the finite element method and verified by experiment. Additionally, straight and bent type waveguides are fabricated. The results show that the MRF filling can control the frequency range at the bandgap and passband of the PnCs plate. The bandgap frequency range shifts to a lower frequency when an external magnetic field is applied.
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