柔性铰链放大式超磁致伸缩致动器磁弹耦合模型

针对超磁致伸缩致动器(GMA)输出位移有限的问题,采用柔性铰链放大机构放大GMA输出位移,利用材料力学理论、拉格朗日动力学方程和有限元法对柔性铰链放大机构的位移放大倍数、动力学特性进行了分析.结合Jiles-Atherton(J-A)模型和二次畴转模型建立了柔性铰链放大式GMA的磁弹耦合模型,并在软件AMESim&Simulink联合仿真环境中进行了数值仿真.制作了柔性铰链放大式GMA样机,对其进行了动态性能实验,仿真和实验表明:经过放大,柔性铰链放大式GMA输出位移可以达到0.4mm;频带宽超过100Hz;所建立的磁弹耦合模型是有效的. 

Magnetic-elastic coupled model of giant magnetostrictive actuator with flexure-hinges amplifier

To extend limited stroke of giant magnetostrictive actuator (GMA), a mechanical amplifier with flexure-hinges was embodied, the actual amplification stroke ratio and dynamic behavior of the mechanical amplifier with flexure-hingers were studied using theoretical material mechanics, Lagrange's dynamical equation and finite element method. The magnetic-elastic coupled model of GMA with flexure-hinges amplifier was established based on the constituted model of Jiles-Atherton(J-A) model and quadratic model; the coupled model was simulated in the co-simulation environment of software AMESim&Simulink. A prototype of GMA with flexure-hinges amplifer was manufactured, followed by a series of dynamic performance tests. Both simulation and test result shows that the stroke of GMA with flexure-hinges amplifier reaches 0.4mm; the frequency bandwidth is above 100Hz and the effectiveness of the coupled model is validated.