超磁致伸缩微位移致动器碟簧特征分析与设计

在传统的超磁致伸缩微位移致动器碟簧设计中，以预压力大小作为唯一设计指标．首先定性分析了微位移致动器的结构形式、传力机理；然后定量分析了超磁致伸缩致动器的输出特征，指出引入软性碟簧的可行性和必要性，使超磁致伸缩材料在阶跃段可获得更大的位移输出．针对不同预压应力及相关条件设计碟簧参数，通过试验证明了采用软性碟簧可以有效降低阶跃段系统等效刚度，从而改善换能系统输出．

Analysis of Disc Spring in Micro-displacement Giant Magnetostrictive Actuator

The traditional design for disc spring in micro-displacement giant magnetostrictive actuator is entirely based on its size, the magnitude of pre-stress as design target, regardless of specific magnetostriction characteristic, making full use of disc spring deformation principle under press. This paper analyzed the structure and force transmission mechanism of actuator assembly qualitatively, then presented quantitatively the displacement output characteristic of giant magnetostrictive material, clarified the feasibility and necessity for utilization of softening disc spring to achieve larger output at the magnetostriction 'jumping' stage characterized in working condition. The parameters of disc spring were designed according to other stage besides pre-stress. The effectiveness of reducing equivalent system stiffness at material 'jumping' stage while improving actuating output was verified by experiment.