Research on Multi-Parametric Coupling Design Method of Deformable Boring Bar in Embedded Giant Magnetostrictive Actuator

Abstract

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.