On the Role of Nonlinearities in Vibratory Energy Harvesting: A Critical Review and Discussion

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A review of energy harvesting using piezoelectric materials: state-of-the-art a decade later (2008–2018) (2019, methodology): “The reader is referred to the reviews by Harne and Wang in 2013 [20] and Daqaq et al in 2014 [243] for more examples of research in nonlinear piezoelectric energy harvesting.”
A methodology for low-speed broadband rotational energy harvesting using piezoelectric transduction and frequency up-conversion (2017, background): “The progress and research topics on vibration energy harvesting are summarized in several comprehensive review papers, such as vibration energy harvesting from human motion and machine operation in [4, 5], nonlinear mechanisms for broadband energy harvesting in [6, 7] and functional materials for en”
A Hybrid Nonlinear Vibration Energy Harvester (2017, methodology): “To increase the bandwidth, several methods introduced nonlinearities into the energy harvesting system [2] such as using stoppers to realize a spring hardening effect [3–5] and using axial static preload to stiffen or soften the structure [6,7].”
Hybrid energy harvesting technology: From materials, structural design, system integration to applications (2020, background): “A number of technical reviews on piezoelectric [16–19], electromagnetic [20], triboelectric [21], thermoelectric [22], pyroelectric [23] or hybrid mechanisms [24,25], have been presented, focusing on materials [26,27], theories [28], configurations, and applications.”