Dynamic Nonlinear Model With Eddy Current Effect for Stress-Driven Galfenol Energy Harvester

A dynamic nonlinear model with eddy current effect has been developed to predict the dynamic responses of the output current, the induced voltage, the electrical power, and the displacement of a Galfenol energy harvester subjected simultaneously to stress and bias magnetic field. This model is obtained by the constitutive equations with eddy current effect, the established electromechanical model and the Armstrong model. The calculated magnetic induction curves of a polycrystalline Galfenol are compared with the measured curves. The effects of the varied operating conditions on the performance of the Galfenol energy harvester are predicated and analyzed.