Ultra-wide bandwidth piezoelectric energy harvesting
Author(s)Hajati, Arman; Kim, Sang-Gook
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Here, we present an ultra wide-bandwidth energy harvester by exploiting the nonlinear stiffness of a doubly clamped microelectromechanical systems (MEMSs) resonator. The stretching strain in a doubly clamped beam shows a nonlinear stiffness, which provides a passive feedback and results in amplitude-stiffened Duffing mode resonance. This design has been fabricated into a compact MEMS device, which is about the size of a US quarter coin. Based on the open circuit voltage measurement, it is expected to have more than one order of magnitude improvement in both bandwidth (more than 20% of the peak frequency) and power density (up to 2 W/cm3) in comparison to the devices previously reported.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Department of Mechanical Engineering
Applied Physics Letters
American Institute of Physics
Hajati, Arman, and Sang-Gook Kim. “Ultra-wide Bandwidth Piezoelectric Energy Harvesting.” Applied Physics Letters 99.8 (2011): 083105. Web. © 2011 American Institute of Physics.
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