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http://dx.doi.org/10.5369/JSST.2019.28.1.36

Study of Mechanical Modeling of Oval-shaped Piezoelectric Energy Harvester  

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)
Publication Information
Journal of Sensor Science and Technology / v.28, no.1, 2019 , pp. 36-40 More about this Journal
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
Piezoelectric energy harvester; Energy harvesting; Mechanical modeling;
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