Dynamic response of the output force of giant magnetostrictive materials

A type of new intelligent micro-deformation material called giant magnetostrictive materials (GMMs) has a wide range of potential applications in the field of micro-vibrations. In this paper, the dynamic response of the output force of GMMs is investigated, and their internal magnetic fields are simulated via the finite element analysis software ANSYS. A test system that primarily includes a force sensor, a GMM, and a DAQ card is constructed to study the dynamic response characteristics of the output force. By changing the applied current in the coils and the pre-tightening force applied on the GMMs, the dynamic response time of the output force is determined. The experimental results show that, when the current in the coils is less than 2.5 A, the response time of the output force decreases with the increase of the outer current. Additionally, the response time of the output force is related to the applied preload, and is the fastest when the preload reaches 300 N. Before the pre-pressure reaches 300 N, the response time of the output force is negatively correlated with the pre-pressure. Finally, when the pre-pressure exceeds 300 N, the response time of the output force becomes greater than before.