  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.
