Broadband Acoustic Energy Confinement in 3D Printed Hierarchical Sonic Crystals
AbstractThe application of additive manufacturing (3D printing) for developing novel sonic crystals is discussed by studying an example of Hierarchical Sonic Crystal (HSC). Fused Deposition Modeling (FDM) additive manufacturing has been employed for rapid prototyping of this structure from Acrylonitrile Butadiene Styrene (ABS) plastic. Finite Elements Method (FEM) has been applied for designing the HSC using band structure analysis. Acoustic measurements are conducted on the sample in a direct field inside an anechoic room. The details of the acoustic experimental setup are discussed and the experimental results are compared with the FEM results. It is shown that HSC is capable of confining acoustic energy over a broad frequency range and at multiple lattice points. The potential application of the HSC for acoustic energy harvesting is discussed.
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