Piezoelectric Device for Impact Energy Harvesting

E Jacquelin (Université de Lyon, France), S Adhikari & MI Friswell (Swansea University)

Smart Materials and Structures, Vol. 20, No. 10, October 2011, paper 105008

Abstract

This paper studies a piezoelectric impact energy harvesting device consisting of two piezoelectric beams and a seismic mass. The aim of this work is to find the influence of several mechanical design parameters on the output power of such a harvester so as to optimize its performance: the electrical design parameters were not studied. To account for the dynamics of the beams, a model including the mechanical and piezoelectric properties of the system is proposed. The impacts involved in the energy harvesting process are described through a Hertzian contact law that requires a time domain simulation to solve the nonlinear equations. A transient regime and a steady-state regime have been identified and the performance of the device is characterized by the steady-state mean electrical power and the transient electrical power. The time simulations have been used to study the influence of various mechanical design parameters (seismic mass, beam length, gap, gliding length, impact location) on the performance of the system. It has been shown that the impact location is an important parameter and may be optimized only through simulation. The models and the simulation technique used in this work are general and may be used to assess any other impact energy harvesting device.

Paper Availability

This material has been published in the Journal of Smart Materials and Structures, Vol. 20, No. 10, October 2011, paper 105008, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by the Institute of Physics.


Link to paper using doi: 10.1088/0964-1726/20/10/105008

Smart Materials and Structures

The Institute of Physics