Dynamic Model of Giant Magnetostrictive Acceleration Sensors Including Eddy-Current Effects

Compared with other types of acceleration sensors, the rare-earth giant magnetostrictive acceleration sensors have obvious advantages. In order to analyze performance of the giant magnetostrictive acceleration sensors, this paper presents a magneto-mechanical strongly coupled dynamic model for the giant magnetostrictive acceleration sensors, which includes eddy-current effects. Using the proposed model, the time characteristic of the induced voltage for the acceleration sensors is calculated by finite element method (FED). In order to validate the presented model, an experiment of the relation between the induced voltage and time for the acceleration sensors has been done. A comparison between the calculated results and measured ones has been carried out to examine the validity of the proposed model and the FED implementation. It is found that both of them are qualitatively in an agreement. This indicates that the proposed FED model can reflect dynamic response performance of the giant magnetostrictive acceleration sensors.