Impact-driven, frequency up-converting coupled vibration energy harvesting device for low frequency operation

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A review of energy harvesting using piezoelectric materials: state-of-the-art a decade later (2008–2018) (2019, background): “Impact driven mechanisms have also been suggested by Gu and Livermore in 2011 [170, 171] and Halim and Park in 2014 [167] that include a compliant driving beam which periodically impacts one or two piezoelectric beams in order to excite the generator beams at their resonant frequency (figure 3(h)).”
Compact passively self-tuning energy harvesting for rotating applications (2011, background): “The generating beam vibrates after impact, first in coupled motion with the driving beam for part of a cycle and then at its own resonant frequency, capturing energy from the ambient low frequency vibration [14].”
A review of the recent research on vibration energy harvesting via bistable systems (2013, background): “To date, a number of nonlinear energy harvesting studies have been conducted, mostly focusing on the monostable Duffing [5–7], impact [8, 9], and bistable oscillator designs.”