Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Study of Mechanical Modeling of Oval-shaped Piezoelectric Energy Harvester

타원형 압전 에너지 하베스터의 기계적 모델링 연구

  • Choi, Jaehoon (KU-KIST Graduate School of Converging Science and Technology) ;
  • Jung, Inki (KU-KIST Graduate School of Converging Science and Technology) ;
  • Kang, Chong-Yun (KU-KIST Graduate School of Converging Science and Technology)
  • 최재훈 (고려대학교 KU-KIST융합대학원) ;
  • 정인기 (고려대학교 KU-KIST융합대학원) ;
  • 강종윤 (고려대학교 KU-KIST융합대학원)
  • Received : 2018.12.27
  • Accepted : 2019.01.18
  • Published : 2019.01.31
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Abstract

Energy harvesting is an advantageous technology for wireless sensor networks (WSNs) that dispenses with the need for periodic replacement of batteries. WSNs are composed of numerous sensors for the collection of data and communication; hence, they are important in the Internet of Things (IoT). However, due to low power generation and energy conversion efficiency, harvesting technologies have so far been utilized in limited applications. In this study, a piezoelectric energy harvester was modeled in a vibration environment. This harvester has an oval-shaped configuration as compared to the conventional cantilever-type piezoelectric energy harvester. An analytical model based on an equivalent circuit was developed to appraise the advantages of the oval-shaped piezoelectric energy harvester in which several structural parameters were optimized for higher output performance in given vibration environments. As a result, an oval-shaped energy harvester with an average output power of 2.58 mW at 0.5 g and 60 Hz vibration conditions was developed. These technical approaches provided an opportunity to appreciate the significance of autonomous sensor networks.

Keywords

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Fig. 1. Schematic of oval-shaped piezoelectric harvester.

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Fig. 2. Base excitation of mass-spring-damper system.

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Fig. 4. Applied force in half oval-shaped piezoelectric energy harvester.

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Fig. 3. Equivalent circuit model of piezoelectric energy harvester.

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Fig. 5. Experimental setup of oval-shaped piezoelectric energy harvester; (a) Front view of experimental setup, (b) Acceleration measurement, (c) Impedance matching, (d) Output characteristic measurement.

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Fig. 6. Open circuit voltage versus vibration frequency of ovalshaped piezoelectric energy harvester; (a) Measured value, (b) Simulated value.

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Fig. 8. Open circuit voltage versus vibration frequency of ovalshaped and cantilever piezoelectric harvesters; (a) Measured value, (b) Simulated value.

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Fig. 9. Maximum output power comparison; (a) Measured value comparison, (b) Simulated value comparison.

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Fig. 7. (a) Simulated output power versus load resistance of ovalshaped piezoelectric energy harvester, (b) Comparison of measured and simulated maximum output power.

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