A Nonlinear Broadband Electromagnetic Vibration Energy Harvester Based on Double-Clamped Beam

Zhuang Lu, Quan Wen, Xianming He and Zhiyu Wen
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Zhuang Lu: Microsystem Research Center, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
Quan Wen: Microsystem Research Center, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
Xianming He: Microsystem Research Center, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China
Zhiyu Wen: Microsystem Research Center, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China

Energies, 2019, vol. 12, issue 14, 1-12

Abstract: The performance of vibration energy harvesters is usually restricted by their frequency bandwidth. The double-clamped beam with strong natural nonlinearity is a simple way that can effectively expand the frequency bandwidth of the vibration energy harvester. In this article, a nonlinear electromagnetic vibration energy harvester with monostable double-clamped beam was proposed. A systematic analysis was conducted and a distributed parameter analytical model was established. On this basis, the output performance was estimated by the analytical model. It was found that the nonlinearity of the double-clamped beam had little influence on the maximum output, while broadening the frequency bandwidth. In addition, the resonant frequency, the frequency bandwidth, and the maximum output all increased following the increase of excitation level. Furthermore, the resonant frequency varies with the load changes, due to the electromagnetic damping, so the maximum output power should be gained at its optimum load and frequency. To experimentally verify the established analytical model, an electromagnetic vibration energy harvester demonstrator was built. The prediction by the analytical model was confirmed by the experiment. As a result, the open-circuit voltage, the average power and the frequency bandwidth of the electromagnetic vibration energy harvester can reach up to 3.6 V, 1.78 mW, and 11 Hz, respectively, under only 1 G acceleration, which shows a prospect for the application of the electromagnetic vibration energy harvester based on a double-clamped beam.

Keywords: electromagnetic vibration energy harvester; frequency bandwidth; double-clamped beam; nonlinearity (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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