Comparing Linear and Essentially Nonlinear Vibration-Based Energy Harvesting

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On the Role of Nonlinearities in Vibratory Energy Harvesting: A Critical Review and Discussion (2014, background): “[55] highlighted this issue by using a probabilistic approach to estimate the steadystate response in the region where multiple solutions coexist.”
Non-linear piezoelectric vibration energy harvesting from a vertical cantilever beam with tip mass (2012, background): “The key aspect of the non-linear harvesters is the use of a double potential well function, so that the device will have two equilibrium positions (Cottone et al., 2009; Ferrari et al., 2010; Mann and Owens, 2010; Quinn et al., 2011; Ramlan et al., 2010).”
A review of energy harvesting using piezoelectric materials: state-of-the-art a decade later (2008–2018) (2019, background): “Introducing mechanical nonlinearities to an energy harvester, the frequency bandwidth of the system can be broadened while increasing the response amplitude and power output [206].”