中文摘要：

为提高射流伺服阀的性能，提出了一种超磁致伸缩执行器驱动的直动式射流伺服阀。采用磁场有限元分析的方法，建立了超磁致伸缩执行器输出电流与输出位移的关系，分析了线圈结构对其输出位移的影响，并给出了所设计执行器的实验曲线。结合所设计的射流伺服阀的特点，以能量传递效率最大为优化目标，建立了射流结构与射流效率的关系方程，求出了所设计射流伺服阀的最佳射流结构参数，并利用流场分析软件分析了其静态特性，其零位无因次压力增益为1．7mm^-1，零位无因次流量增益为1．9mm^-1。

英文摘要：

In order to improve the performance of a jet-pipe servovalve, a novel direct drive jet-pipe servovalve driven by a giant magnetostrictive actuator is proposed in this paper. By means of magnetic field finite element analysis, a model of the giant magnetostrictive actuator is established. The influence of coil structure on actuator displacement is analyzed and the experimental curves of the designed actuator are given. On the basis of the designed jet-pipe servovalve and taking the max- imum energy transfer efficiency as the optimization objective, an equation is built between the jet parameters and jet efficien- cy. The best jet structure parameters of the designed servovalve are worked out, and its static characteristics are analyzed with the help of a flow field analysis software. The results show that its null dimensionless pressure gain is 1.7 mm^-1, and the null dimensionless flow gain is 1.9 mm^-1 .