A frequency self-tuning energy harvesting methodology is proposed to achieve efficient energy harvesting. To simulate the self-tuning process, a theoretical model of the harvester made of an aluminum beam bonded with piezoelectric patches is developed for numerical simulation. The energy harvesting is realized by converting ambient vibration to electric charge through piezoelectric patches on the host beam. To accomplish the frequency self-tuning process, a control voltage is applied on a piezoelectric stack actuator to tune the natural frequency of the beam harvester matching the major excitation frequency of the ambient vibration with large power generation. Two tuning methods with different electric circuits are developed to find the efficient and feasible self-tuning process, which is then further verified by the finite element method. Research findings show that the optimal frequency self-tuning method significantly increases the power output from the harvester by more than 26 times compared with the one without tuning. / October 2016
| Identifer | oai:union.ndltd.org:MANITOBA/oai:mspace.lib.umanitoba.ca:1993/31645 |
| Date | January 2015 |
| Creators | Cheng, Yukun |
| Contributors | Wu, Nan (Mechanical Engineering), Xing, Malcolm (Mechanical Engineering) Cha, Young-Jin (Civil Engineering) |
| Publisher | ASME 2015 International Mechanical Engineering Congress and Exposition |
| Source Sets | University of Manitoba Canada |
| Detected Language | English |
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