Investigation of an ultra-low frequency piezoelectric energy harvester with high frequency up-conversion factor caused by internal resonance mechanism

被引:102
|
作者
Wu, Yipeng [1 ]
Li, Sen [1 ]
Fan, Kangqi [2 ]
Ji, Hongli [1 ]
Qiu, Jinhao [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Nanjing 210016, Peoples R China
[2] Xidian Univ, Sch Mechanoelect Engn, Xian 710071, Peoples R China
关键词
Vibration energy harvesting; Frequency up-conversion; Compound pendulum; Piezoelectric harvester; Internal resonance; PERFORMANCE; VIBRATIONS; GENERATOR;
D O I
10.1016/j.ymssp.2021.108038
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The collection of ultra-low frequency mechanical energy that distributed in ambient environments remains challenging so far. This paper presents a frequency up-converting energy harvester based on a component pendulum, a pair of magnetic coupled cantilever beams, and two mechanical stoppers. The pendulum-like oscillator with ultra-low natural frequency can efficiently capture ambient mechanical energy and the designed 1:2:6 internal resonance mechanism can upconvert the frequency with a high conversion factor, presenting great potential for application in real-world systems with low vibration frequencies in the range of 1 to 5 Hz. Modeling and design are conducted, theoretical dynamic predictions are given and confirmed by experimental results. The proposed frequency up-converting harvester could generate a relatively high output power (about 2 mW) at a low excitation frequency and amplitude (around 2 Hz and 0.37 g). Moreover, the electromechanical coupling coefficient of the harvester can be further optimized, increasing the above-mentioned output power directly.
引用
收藏
页数:16
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