An acoustic bending waveguide is designed by transformation acoustics. A two-dimensional square area with anisotropic and homogeneous material properties is transformed into a fan-shaped area with anisotropic and inhomogeneous material properties to rotate the direction of beam propagation. The transformation medium can be realized by alternating layered structure consisting of water and fluid with negative mass density. We propose that an acoustic metamaterial composed of three layers in water background can be designed to replace negative mass density fluid and achieve the acoustic bending waveguide.
An Acoustic Metamaterial Bending Waveguide Design Using Transformation Acoustics
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Wu, L, Chiang, T, Wu, M, & Chen, L. "An Acoustic Metamaterial Bending Waveguide Design Using Transformation Acoustics." Proceedings of the ASME 2011 International Mechanical Engineering Congress and Exposition. Volume 8: Mechanics of Solids, Structures and Fluids; Vibration, Acoustics and Wave Propagation. Denver, Colorado, USA. November 11–17, 2011. pp. 937-943. ASME. https://doi.org/10.1115/IMECE2011-63290
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