An auxetic nonlinear piezoelectric energy harvester for enhancing efficiency and bandwidth

In this paper, we design and experimentally validate an auxetic nonlinear piezoelectric energy harvester. This harvester adopts a clamp-clamp beam with auxetic structures, which can improve the efficiency and bandwidth of the energy harvesting based on a pure mechanical structure without outer magnets or stoppers. Finite element analysis is performed to analyse the effects of the auxetic structures on the efficiency and nonlinearity of the energy harvester. The lumped parameter model is utilized to predict the performance of the energy harvester, which well matches the experimental results. In the experimental validation, at 0.1 g base acceleration, the power output of the two types of auxetic energy harvesters is 173% and 94% higher than the conventional nonlinear energy harvester. Besides, the bandwidths of the two types of auxetic energy harvesters are broadened by 1556% and 2142% compared with the linear systems.

Automated summary

This paper presents the design and experimental validation of an auxetic nonlinear piezoelectric energy harvester, which improves efficiency and bandwidth compared to traditional systems. Experimental results show higher power output and bandwidth expansion for the auxetic energy harvesters.