Strategies for increasing the operating frequency range of vibration energy harvesters: a review

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Investigation of Multimodal Electret-Based MEMS Energy Harvester With Impact-Induced Nonlinearity (2018, background): “broadband harvesting strategies through multi-modal structures and nonlinear techniques [3], [4].”
A review on energy harvesting approaches for renewable energies from ambient vibrations and acoustic waves using piezoelectricity (2017, background): “A detailed review of multi-frequency and broadband energy scavenging was presented by Zhu et al [15].”
Improved Energy Harvesting from Wideband Vibrations by Nonlinear Piezoelectric Converters (2009, positive): “among which the use of array of generators with different resonance frequencies and nonlinear or bistable structures have been recently reported as particularly effective [13].”
Piezoelectric MEMS Energy Harvester for Low-Frequency Vibrations With Wideband Operation Range and Steadily Increased Output Power (2011, background): “[35] have reviewed and summarized many strategies to adjust or to tune the resonant frequency [36]–[41], or to widen the frequency bandwidth of the EH such that a”
Impedance Modeling and Analysis for Piezoelectric Energy Harvesting Systems (2012, background): “Ever since then, most literature, including a majority of review articles [5], [36]–[40], regarded this model as the general model for vibration energy harvesting devices, including piezoelectric, electromagnetic, and electrostatic.”