祝贺课题组与美国马里兰大学航空航天系Dr.Wereley教授合作研究论文在期刊Smart Materials and Structures上在线出版
论文题目：Theoretical and experimental investigations of a magnetostrictive electro-hydrostatic actuator
论文作者：Zhu yuchuan；Yang Xulei；Wereley Norman M
投稿时间：13-Mar-2018
录用时间：28-Jun-2018
在线出版时间：22-Sep-2018
摘要：In this paper, the time-domain models of a magnetostrictive material-based electro-hydrostatic actuator (MEHA) are built from the viewpoint of energy conversion, which consists of four energy transformation stages: electrical-magnetic, magneto-elastic, elastic-hydraulic and hydraulic-mechanical energy transformation. Accordingly, a Jiles-Atherton hysteresis model with the dynamic eddy current effect has been incorporated into the whole MEHA model, and a magneto-elastic energy transformation model has been established to depict not only the relation between the magnetostriction and magnetization of a giant magnetostrictive material (GMM) rod but also that between the magnetostriction and prestress of the GMM rod. Based on Boyle's law, an effective fluid bulk modulus equation is deduced to show a nonlinear functional relationship with fluid pressure. A pump chamber pressure model, a reed valve port flow equation model, a reed valve vibration model, a fluid pressure model in the high-pressure side cylinder, and a fluid motion model are later built sequentially to depict the complicated elastic–hydraulic transformation process. Finally, the experimental data show that the cylinder piston displacement and the pump flowrate agreed well with the established model results whether under free load or under various load.