Piezoelectric MEMS-based wideband energy harvesting systems using a frequency-up-conversion cantilever stopper

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A Review on Piezoelectric Energy Harvesting: Materials, Methods, and Circuits (2017, methodology): “The most commonly used approach for reducing the natural frequency involves the addition of a large inertial tip mass to the free end of a simple single cantilever beam structures (Choi et al. 2006; Liu et al. 2012; Tsujiura et al. 2013; Xu et al. 2012a).”
Novel piezoelectric bistable oscillator architecture for wideband vibration energy harvesting (2013, unknown): “More recently, a hardening cantilever beam realized by the interaction of magnets was theoretically [10] and experimentally [11] investigated by Sebald et al. Another approach, developed by Liu et al [12] uses mechanical stoppers to increase the frequency bandwidth.”