... to affect the equivalent mechanical properties of an elastic waveguide and therefore suggest their applications in developing tunable band gaps in phononic crystals. In addition, a 1D active acoustic metamaterial with simultaneously programmable bulk modulus and density was proposed through mounting voltage...

... pattern to suit many applications. active acoustic metamaterials programmable metamaterials effective density effective bulk modulus multicell composite metamaterials Acoustic metamaterials have recently attracted the focus of many researchers as a new technique for achieving wave...

... properties along and across the material volume. With such unique capabilities, physically realizable acoustic cloaks can be achieved and objects treated with these active metamaterials can become acoustically invisible. The theoretical analysis of this class of active acoustic metamaterials is presented...