A wideband integrated piezoelectric bistable generator: Experimental performance evaluation and potential for real environmental vibrations

作者：Liu Weiqun; Badel Adrien^*; Formosa Fabien; Wu Yipeng; Bencheikh Nabil; Agbossou Amen

来源：Journal of Intelligent Material Systems and Structures, 2015, 26(7): 872-877.

DOI：10.1177/1045389X14546660

• Power generator
• piezoelectric
• energy harvesting
• bistable
• wideband

Bistable generators have been proposed as potential solutions to the challenge of variable vibration frequencies. This article presents a novel mono-block design of bistable generator based on mechanical buckling effect. A bistable structure composed of four thin beams as flexible hinges, two amplified piezoelectric stacks as electromechanical springs, and a dynamic mass is fabricated. Its volume is 5.46cm(3), and it reaches a power density of 0.48mW/cm(3). The wideband and high-power energy harvesting properties are first validated using chirp excitations with an obtained bandwidth of 11Hz (812% improvement compared with the linear equivalent case). The generator's good performance is then further confirmed for bandlimited noise excitations and a real vibration signal from a driving car wheel.

• 出版日期2015-5