Energy harvesting from a rotating rigid disk system with two console beams and piezoelectric

In this research, a energy harvesting system was introduced in which two console beams coupled with ‎piezoelectric layers are ‎connected to a rotating rigid disk. ‎First, the system equations were written using the ‎electromechanical Lagrange equations and then solved by exact solution and resonance ‎approximation of the exact solution methods. The energy harvesting system was also simulated ‎in software. The effect of angular velocity on resistance, voltage and optimal power was ‎investigated and observed that increasing angular velocity, the optimal resistance and voltage ‎first decrease and then increase, but the optimal power first increases and then decreases. ‎Optimal minimum resistance and voltage and maximum optimal power are obtained at 44 ‎rad/s. The results showed that in this system in order to produce absolute maximum power of ‎‎0.094 W, electrical resistance of 1115 Ω is required. Power were also evaluated versus ‎electrical voltage and resistance. Moreover, comparison of the results of the three methods ‎showed very good agreement between the results of solving equations and simulation and ‎resonance approximation solution responses are simpler than exact solution ones and have ‎negligible error.‎