Deformable boring bar is the executive component of embedded giant magnetostrictive actuator (GMA), which plays a key role in the output performance of embedded GMA in precision machining of non-cylindrical piston pinhole. In this paper, a multi-parametric coupling design method was presented for deformable boring bar and giant magnetostrictive material. Firstly, the dynamic model of deformable boring bar was built. Second, the performance index of length-diameter ratio was introduced, and the problem of multi-parametric coupling design was solved by using the idea of nonlinear programming. The first-order natural frequency, the end output displacement and the output force of deformable boring bar were taken as the evaluation indexes to ensure the performance requirements of embedded GMA. Finally, according to project requirements and proposed method, an embedded GMA with high frequency response and large output displacement was further designed, which met the performance requirements of displacement and stiffness in precision machining of non-cylindrical piston pinholes and also verified the validity of the design method.

可变形镗杆是嵌入式巨型磁致伸缩执行器（GMA）的执行组件，在非圆柱活塞针孔的精密加工中，它对嵌入式GMA的输出性能起着关键作用。本文提出了一种可变形的镗杆和巨型磁致伸缩材料的多参数耦合设计方法。首先，建立了可变形镗杆的动力学模型。其次，介绍了长径比性能指标，并利用非线性规划的思想解决了多参数耦合设计的问题。以一阶固有频率，端部输出位移和可变形镗杆的输出力作为评估指标，以确保嵌入式GMA的性能要求。最后，