Structural magnetic strain model for magnetostrictive transducers

This paper addresses the modeling of strains generated by magnetostrictive transducers in response to applied magnetic fields. The measured strains de pend on both the rotation of moments within the material in response to the held and the elastic properties of the material, The magnetic behavior is characterized by considering the Jiles-Atherton mean field theory for ferro magnetic hysteresis in combination with a quadratic moment rotation model f or magnetostriction. Elastic properties must be incorporated to account for the dynamics of the material as it vibrates. This is modeled by force bala ncing, which yields a wave equation with magnetostrictive inputs. The valid ity of the resulting transducer model is illustrated by comparison with exp erimental data.