Energy harvesting in the nonlinear piezoelastic systems driven by stochastic excitations

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.