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Sensors 2017, 17(5), 970; doi:10.3390/s17050970

Vibro-Shock Dynamics Analysis of a Tandem Low Frequency Resonator—High Frequency Piezoelectric Energy Harvester

1
Faculty of Mechanical Engineering and Design, Kaunas University of Technology, Studentu 56, Kaunas LT-51368, Lithuania
2
Institute of Mechatronics, Kaunas University of Technology, Studentu 56-123, Kaunas LT-51368, Lithuania
3
Faculty of Mathematics and Natural Sciences, Kaunas University of Technology, Studentu 50, Kaunas LT-51368, Lithuania
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 17 March 2017 / Revised: 23 April 2017 / Accepted: 24 April 2017 / Published: 27 April 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [20450 KB, uploaded 27 April 2017]   |  

Abstract

Frequency up-conversion is a promising technique for energy harvesting in low frequency environments. In this approach, abundantly available environmental motion energy is absorbed by a Low Frequency Resonator (LFR) which transfers it to a high frequency Piezoelectric Vibration Energy Harvester (PVEH) via impact or magnetic coupling. As a result, a decaying alternating output signal is produced, that can later be collected using a battery or be transferred directly to the electric load. The paper reports an impact-coupled frequency up-converting tandem setup with different LFR to PVEH natural frequency ratios and varying contact point location along the length of the harvester. RMS power output of different frequency up-converting tandems with optimal resistive values was found from the transient analysis revealing a strong relation between power output and LFR-PVEH natural frequency ratio as well as impact point location. Simulations revealed that higher power output is obtained from a higher natural frequency ratio between LFR and PVEH, an increase of power output by one order of magnitude for a doubled natural frequency ratio and up to 150% difference in power output from different impact point locations. The theoretical results were experimentally verified. View Full-Text
Keywords: vibration energy harvesting; vibro-shock piezoelectrics; multi-beam dynamics; frequency up-conversion; numerical modeling vibration energy harvesting; vibro-shock piezoelectrics; multi-beam dynamics; frequency up-conversion; numerical modeling
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MDPI and ACS Style

Žižys, D.; Gaidys, R.; Ostaševičius, V.; Narijauskaitė, B. Vibro-Shock Dynamics Analysis of a Tandem Low Frequency Resonator—High Frequency Piezoelectric Energy Harvester. Sensors 2017, 17, 970.

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