Dynamics and coherence resonance of a laminated piezoelectric beam for energy harvesting

This paper investigates the problem of harvesting energy from transverse base vibration by a laminated piezoelectric beam. The beam is fixed at one end and subjected to a compressive load at the other end. The electromechanical model is set up, and the corresponding equations are derived by extended Hamilton principle. The simulation is carried out, and the results are obtained. The response under harmonic excitation exhibits that the system experiences period-doubling bifurcation and chaos as frequency varies, and the buckled state can generate more power compared to the unbuckled one. Coherence resonance is proved and can be observed when the system is subjected to Gauss white noise excitation, which can be used to optimize the efficiency of energy harvesting.