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Recent explorations of topology in physical systems have led to a new paradigm of condensed matters characterized by topologically protected states and phase transition, for example, topologically protected photonic crystals enabled by magneto-optical effects. However, in other wave systems such as acoustics, topological states cannot be simply reproduced due to the absence of similar magnetics-related...
In this paper, the bandgap properties of three-dimensional holey phononic crystals with Helmholtz resonators are investigated by using the finite element method. The resonators are periodically arranged cubic lumps in the cubic holes connected to the matrix by one narrow connector. In contrast to a system with cubic or spherical holes, which has no bandgaps, systems with Helmholtz resonators can exhibit...
The band structures of 2D vacuum/solid square phononic crystals with cross-like holes are calculated by using the finite element method, the effects of geometric parameters on bandgaps are studied and compared with those of the phononic crystals with square holes. The numerical computation is performed by Comsol Multiphysics 3.5a. The results show that no bandgap exists for phononic crystals with...
As different types of noises coming from different vehicles and weapons mix together, it is a challenge to identify acoustic objectives in such a noisy situation. A systematical study of acoustic objective recognition in wireless sensor network is conducted in this paper. At first, the acoustic target recognition model is introduced, which is based on the characteristics of wireless sensor networks...
Acoustic wave exhibits inherently different characters when propagating in sonic band-gap materials. We address negative refractions of acoustic wave both experimentally and theoretically in two dimensional sonic crystals constructed with steel rods embedded in air. With lattice symmetry and artificial ldquoatomsrdquo designing, refraction of acoustic wave in the crystals could be manipulated from...
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