Rotation-induced-tunable stochastic resonance for stabilizing sustainability of energy harvesting

Abstract

Energy harvesting from rotating system has been an important topic for realizing the applications of tire monitoring system. This paper proposes a self-tuning stochastic resonance for exploring its principle for further stabilizing the sustainable capability of energy harvesting. The principle of stochastic resonance of a nonlinear system in a rotating environment is studied which is used to increase the energy harvesting efficiency of the cantilever piezoelectric vibrator at low frequencies. The centrifugal force caused by the behavior of ration acting on the end mass of the cantilever changes the equivalent stiffness of the cantilever and thus can tune the stochastic resonance frequency. Through the match-able relationship of non-linear bitable system between the Kramers rate and the external rotation frequency, the optimal centrifugal distance is theoretically obtained. The simulation results show that when the centrifugal distance is 12.11 cm, the effective frequency bandwidth of the system response is broadened to 20–40 rad/s and the output root mean square (RMS) voltage is significantly improved.