Broadband energy harvesting using acoustic black hole structural tailoring

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Characterization of acoustic black hole effect using a one-dimensional fully-coupled and wavelet-decomposed semi-analytical model (2016, background): “In addition, it also shows potential in sound radiation control [11,12] and energy harvesting due to the high energy concentration within a confined area [13].”
A review of energy harvesting using piezoelectric materials: state-of-the-art a decade later (2008–2018) (2019, background): “More recently, a novel nonlinear approach to enhance the piezoelectric energy harvesting performance of beams and plates was proposed by Zhao et al in 2015 [196, 205] by utilizing acoustic black holes (ABHs) to design a dynamically tailored structure.”
The acoustic black hole: A review of theory and applications (2020, background): “This class of applications was studied both numerically [106] and experimentally [107] and relied on the fundamental premise that the focusing effect taking place at the center of the ABH provides a priori information on structural locations that will experience high energy density.”