期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 156, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2021.107608
关键词
Bistable; Energy harvesting; Nonlinear vibration; Electromagnetic energy harvester; Harvester
资金
- Zhejiang Provincial Natural Science Foundation of China [LY20E050001]
- China Postdoctoral Science Foundation [2020M681285]
- Open Research Fund of Key Laboratory of Space Utilization of Chinese Academy of Sciences [LSU-KFJJ-2020-01]
This study investigates the energy harvesting enhancement of a two-degree-of-freedom bistable electromagnetic energy harvester by designing the interaction between magnetic forces. Theoretical analysis and experimental verification are conducted to explore the impact of various parameters on the energy harvesting performance, revealing the importance of mass ratio, frequency ratio, potential well, and excitation amplitude.
The working bandwidth is an attractive aspect of vibrational energy harvesters. This paper investigates the energy harvesting enhancement of a two-degree-of-freedom (2-DOF) bistable electromagnetic energy harvester (BEEH). The bistability is achieved by designing the interaction between magnetic repulsive and attractive forces. The nonlinear restoring force is adding in one of the degrees to construct two types of 2-DOF-BEEHs. The output voltages and powers of the two types of the 2-DOF-BEEHs are discussed and compared after analyzing the kinetic equations of the harvesters. The theoretical model of the 2-DOF-BEEH is established and the analytical solution is obtained by applying the harmonic balance method (HBM). Several parameters such as mass ratio, frequency ratio, potential well and excitation amplitude are discussed. Theoretical and experimental efforts are carried out to verify the energy harvesting performance of the 2-DOF-BEEH. The results indicate that a bigger mass ratio can enhance the amplitude of the two resonance peaks while a smaller frequency ratio leads to a better performance. Moreover, the two resonant peaks will also be influenced by the shapes and depths of potential well. A larger initial excitation displacement can enhance the first-order resonance peak of the 2-DOF-BEEH. (c) 2021 Elsevier Ltd. All rights reserved.
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