Abstract
An ultralight phononic beam (PB) using the complex lattice of acoustic black holes (ABHs) is designed for producing broad low-frequency band gaps (BGs). Its unit-cell contains in-series outward-and-inward-curved ABHs and is over one-third lighter than its simple-lattice counterparts. Ultrawide low-frequency BGs are achieved due to multi-modal and complex-modal behaviors and the reduced structure stiffness by extra ABH introduced in the unit-cell. The BGs are tunable to lower and broader frequencies by adjusting the residue thickness of each ABH. Furthermore, broad low-frequency vibration attenuations of the finite-size PB are investigated and experimentally verified. Our approach allows broadband low-frequency vibration control by using an ultralight structure.
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