A Tower-Shaped Three-Dimensional Piezoelectric Energy Harvester for Low-Level and Low-Frequency Vibration
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A Tower‑Shaped Three‑Dimensional Piezoelectric Energy Harvester for Low‑Level and Low‑Frequency Vibration Xiaoxiang Wei1 · Haibo Zhao1 · Junjie Yu1 · Yiming Zhong1 · Yanlin Liao1,2 · Shiwei Shi1 · Peihong Wang1,3 Received: 2 March 2020 / Revised: 28 July 2020 / Accepted: 21 October 2020 © Korean Society for Precision Engineering 2020
Abstract The multiple forms of vibration exist in an ambient environment diffusely and already become a considerable object for energy harvesting. However, how to effectively extract low-level, low-frequency, and multi-directional vibration from the ambient environment is becoming a key issue in the field of energy harvesting. To solve this issue, a tower-shaped piezoelectric vibration energy harvester (TS-PVEH) is reported. Finite element simulation indicates that TS-PVEH works in two fundamental modes, i.e., its in-plane and out-of-plane vibration modes. Meanwhile, simulation results show that the natural frequency of TS-PVEH is 3.39 Hz, 3.40 Hz, and 11.50 Hz, respectively; and the experiments also verified that. By virtue of the tower structure of TS-PVEH, the device is pretty sensitive to three-dimensional vibration. At a low level of acceleration 1 m/s2, the maximum load power of TS-PVEH is 65.8 µW in out-of-plane mode and 17.2 µW in in-plane mode, respectively. Furthermore, the effects of the PVDF connection mode on the output performance of TS-PVEH were studied in detail, and comparative experimental results show that a reasonable connection of PVDF can improve energy harvesting efficiency. The proposed TS-PVEH is expected to be used to scavenge energy from multi-dimensional, low-level, and low-frequency vibrations that present in an ambient environment. Keywords Piezoelectric vibration energy harvester · Three-dimensional vibration · Low-frequency · Multimodal
1 Introduction Recently, wireless electronic devices, wireless sensor networks, biomedical devices, and wearable electronics play an important role in most areas of life sciences, industry, and medicine, etc. [1, 2]. At present, most low-power devices are still battery-powered [3]. Due to the limited life of chemical batteries, it is impossible to maintain the normal operation of the device for a long time. Therefore, some researchers have proposed a way to collect energy from the environment * Peihong Wang [email protected] 1
School of Physics and Materials Science, Energy Materials and Devices Key Lab of Anhui Province for Photoelectric Conversion, Anhui University, Hefei, Anhui 230601, People’s Republic of China
2
State Key Laboratory of Pulsed Power Laser Technology, Hefei 230037, People’s Republic of China
3
Key Laboratory of Structure and Functional Regulation of Hybrid Materials, Ministry of Education, Anhui University, Hefei, Anhui 230601, People’s Republic of China
instead of the traditional battery power [4]. There are many forms of energy in the environment, such as mechanical vibration energy, wind energy, thermal energy, oc
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