Three-dimensional piezoelectric cantilever-beam energy harvester

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (22) : 57-66.

MA Xiaojun,LENG Yonggang,LIU Jinjun,FAN Shengbo

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Abstract

In order to harvest vibration energy in any direction, a three-dimensional energy harvester was proposed.Its monostable or bistable oscillation characteristics of each cantilever increase the efficiency of energy harvesting.The system dynamic modeling and the nonlinear magnet force in analysis were implemented.The simulation results were compared with experimental results, and the optimization of the structure was carried out.It is shown that in a certain bandwidth and intensity range of random excitation, in the system exists at least one magnet gap which leads to the peak values of output voltages in two axes directions, meanwhile ensures a high-level second optimum in the third axis direction.By adjusting this optimal distance, the energy harvesting can be kept in a high-efficiency state without structural adjustments in real vibrational environment.

Key words

/ vibration energy harvesting；piezoelectric cantilever；three-dimensional space

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MA Xiaojun,LENG Yonggang,LIU Jinjun,FAN Shengbo. Three-dimensional piezoelectric cantilever-beam energy harvester[J]. Journal of Vibration and Shock, 2018, 37(22): 57-66

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