Multifield Coupling Model With Dynamic Losses for Giant Magnetostrictive Transducer

A system-level electromagnetic-mechanical-thermal multifield coupling model of a giant magnetostrictive transducer is proposed based on the thermodynamic theory, Jiles-Atherton model, energy balance principle, and structural dynamics principle of the transducer system. The model includes the electromagnetic-mechanical-thermal coupling terms and takes the dynamic losses into account. The model parameters can be easily determined by the measurable experiments. According to the proposed model, the relation between the magnetic field and the output strain of the transducer was calculated using a numerical algorithm. The computed results are in good agreement with the experimental ones. One of the key contributions of this paper is that both the temperature-dependent Terfenol-D material properties with dynamic losses and the structural dynamics of the transducer system are taken into account.