Design and simulation of a frequency self-tuning vibration energy harvester for rotational applications
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TECHNICAL PAPER
Design and simulation of a frequency self-tuning vibration energy harvester for rotational applications Licheng Deng1
•
Jian Jiang1 • Lin Zhou1 • Dingli Zhang1 • Yuming Fang1
Received: 3 September 2020 / Accepted: 10 October 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In order to broaden the operating frequency bandwidth of the vibration energy harvester (VEH), a novel frequency selftuning VEH is proposed for rotating applications. Under the rotating excitation, the proposed VEH can simultaneously adjust two parameters that affect the resonant frequency by centrifugal force, which is the key to realize frequency selfmatching of the VEH in a certain frequency range. The two parameters are the axial force and effective length of the piezoelectric beam. A frequency tuning mass was designed to effectively adjust the axial force of the piezoelectric beam, and a nonlinear spring was designed to accurately control the effective length of the piezoelectric beam. The proposed VEH was simulated with ANSYS. The simulation results show that there is only one frequency matching point in a certain rotation frequency range when the centrifugal force only changes the axial force of the piezoelectric beam, which is the reason why the reported self-tuning VEH can not achieve frequency self-matching within a certain frequency range. When the centrifugal force simultaneously changes the axial force and the effective length of the piezoelectric beam, the frequency self-matching can be realized in a certain frequency range instead of only one frequency point. Simulation data analysis shows that the proposed VEH can achieve frequency self-matching in the range of 10–20 Hz through easy spring design.
1 Introduction In recent years, the ultra-low-power microelectronic devices and systems (such as embedded sensors, medical implants, wireless communication nodes, and so on) have been developed rapidly, while the development of traditional battery is seriously lagging behind (Paradiso and Starner 2005). When battery powered, the shortage of large size, weight and short life of the battery is increasingly prominent. Those greatly promote the development of the ambient vibration energy harvester (VEH) which has the advantages of long-time power supply and so on, so as to replace the traditional battery to supply power to microelectronic devices and systems (Maamer et al. 2019). However, through more than 20 years of efforts (Williams and Yates 1996), the VEH is still difficult to be used in practice. The main reason is that the output performance of & Licheng Deng [email protected] 1
College of Electronic and Optical Engineering and College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
the VEH will decrease rapidly under off resonance excitations. As a result, broadening the operating frequency bandwidth of the VEH has drawn increasing attention in recent years (Yildirim et al. 2017). In rotational
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