Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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On the Energy Conversion Efficiency of Piezoelectric Vibration Energy Harvesting Devices

압전 진동 에너지 수확 장치의 에너지 변환 효율에 대한 고찰

  • Kim, Jae Eun (School of Mechanical and Automotive Engineering, Catholic Univ. of Daegu)
  • 김재은 (대구가톨릭대학교 기계자동차공학부)
  • Received : 2015.01.23
  • Accepted : 2015.02.27
  • Published : 2015.05.01

Abstract

To properly design and assess a piezoelectric vibration energy harvester, it is necessary to consider the application of an efficiency measure of energy conversion. The energy conversion efficiency is defined in this work as the ratio of the electrical output power to the mechanical input power for a piezoelectric vibration energy harvester with an impedance-matched load resistor. While previous research works employed the electrical output power for approximate impedance-matched load resistance, this work derives an efficiency measure considering optimally matched resistance. The modified efficiency measure is validated by comparing it with finite element analysis results for piezoelectric vibration energy harvesters with three different values of the electro-mechanical coupling coefficient. New findings on the characteristics of energy conversion and conversion efficiency are also provided for the two different impedance matching methods.

Keywords

Vibration;Energy Harvesting;Piezoelectricity;Conversion Efficiency;Impedance Matching;Electro-Mechanical Coupling Coefficient

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Acknowledgement

Supported by : 대구가톨릭대학교

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