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http://dx.doi.org/10.5050/KSNVE.2015.25.6.406

Electrically Induced Damping Characteristics and a Relevant Requirement for the Maximum Power Generation in Piezoelectric Vibration Energy Harvesters  

Kim, Jae Eun (School of Mechanical and Automotive Engineering, Catholic University of Daegu)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.25, no.6, 2015 , pp. 406-413 More about this Journal
Abstract
The piezoelectric coupling in piezoelectric vibration energy harvesters with load resistance induces electrical damping as well as increase in the system stiffness. Starting from analytically deriving the explicit relations through governing equations in the frequency domain, this work identifies the characteristics of the electrically induced damping mechanism and shows that the electrically induced damping serves as a structural hysteretic damping on condition that a piezoelectric vibration energy harvester is excited at its short-circuit resonant frequency and its load resistor is optimally impedance- matched at the same time. Finally, it is analytically verified that the equivalence of a mechanical and an electrically induced damping ratio is required for the maximum power generation at a load resistor, which was claimed in some literature.
Keywords
Vibration Energy Harvesting; Piezoelectricity; Electrically Induced Damping; Maximum Power; Structural Hysteretic Damping;
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Times Cited By KSCI : 2  (Citation Analysis)
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