Energy harvesting in the nonlinear piezoelastic systems driven by stochastic excitations

TL;DR

This study investigates how background stochastic noise influences the power output of a nonlinear piezoelastic energy harvester with magnetic coupling, revealing the effects of noise amplitude and system parameters on energy generation.

Contribution

It introduces a model of a nonlinear magnetic piezoelastic energy harvester subjected to stochastic excitations, analyzing the impact of noise and system parameters on power output.

Findings

Power output varies with stochastic noise amplitude and excitation frequency.

System mistuning affects energy harvesting efficiency.

Mean power output depends on the stochastic excitation characteristics.

Abstract

In our work we examine the influence of background stochastic excitations on the power output generated by the energy harvester. The harvesting device we considered is composed of two small magnets, attached to piezoelastic oscillators, which are moving in the magnetic field produced by the static magnets fastened directly to the device. The moving magnets are coupled together by an electrical circuit. The nonlinearity of the system is achieved by the variable distance between the moving and static magnets, and additionally by the mass difference between them. The stochastic noise applied to the system obeys the Gaussian distribution. We examine the power output generated on the electric load at different excitation frequencies for different values of mistuning parameters and different stochastic amplitudes. We also present the mean value of the power generated averaged over a range of considered frequencies.