Effect of stochastic excitation on sub-harmonic solutions in a bistable energy harvester

Broadband frequency energy harvesting systems are based on nonlinear resonators. Ambient kinetic is transformed to electric by a piezoelectric patch installed the elastic beam. In this paper we study bistable harvester consisted of resonator with some nonlinearities induced magnets. The system excited combined effect frame harmonic and stochastic motions. Starting from initial conditions minimum observe considerable improvement performance in presence excitation component. Our calculations clearly indicate existence bifurcations that system.