对三自由度微振动主动隔振平台的基础器件--超磁致伸缩驱动器（GMA）和放大机构进行结构参数的优化设计。基于对GMA系统从能量输入到输出整个过程的电-磁-机械耦合特性分析，提出了结构的能量损耗率最小的优化方法。结构参数优化后的GMA能量损耗率仅为优化前的0.34倍。将优化结果带入驱动系统动力学模型，优化后的位移响应幅值增大为优化前的2.28倍，初始时刻的冲击加速度响应减小为优化前的0.11倍。仿真结果表明基于能量损耗率最小的超磁致伸缩驱动系统的优化设计方法有效，设计结果满足微振动隔振平台对GMA及放大机构的驱动稳定性、驱动效率、驱动幅值的设计要求。%The structure optimization of a giant magnetostrictive actuator (GMA) and its displacement amplifier applied to a 3-DOF active micro-vibration isolation platform is presented. Though the analysis of the electro-magnetic-mechanical coupling features of the GMA system in the process from energy input to output, the optimization method based on the principle of minimum rate of energy loss with the structural parameters as the design variables is proposed. It is found that after the optimization, the energy loss rate is reduced to 0.34 of that before the optimization. Applying the optimization results to the dynamic model, the amplitude of the displacement response of the GMA system is raised to 2.28 times of that before the optimization. And the initial shock acceleration response is reduced to 0.11 of that before the optimization. The simulation results prove that the design method of the optimization based on the minimum rate of energy loss is efficient, and the design of the actuator can meet the requirements of high efficient, stability and accurate displacement amplitude of the driving performance for the target vibration isolation platform.
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