仿生鱼鳍中形状记忆合金驱动器的水下变形精度分析

简要介绍了仿生鱼鳍的基本机构和工作原理．为了提高形状记忆合金仿生鱼鳍的变形精度，理论计算了作为鱼鳍驱动器的形状记忆合金薄板对端部的水下变形误差．给出了形状记忆合金薄板表面的流体无量纲阻力系数随时间的变化关系，同时给出了某一时刻薄板表面及其周边的压力分布和薄板尾迹中的卡门涡街形态．最后，通过实验验证了理论推导的正确性．

Underwater Deformation Precision Analysis of Shape Memory Alloy Actuators Used in Biomimetic Fish Fin

The basic structure and working principle of biomimetic fish fin is briefly introduced.Then,the tip deformation error of the shape memory alloy(SMA) plate pair used as fin actuators is computed theoretically to improve the deformation precision of the SMA biomimetic fish fin.The relationship between the non-dimensional drag coefficient of SMA plate surface and time is presented,and the pressure distribution on and around the SMA plate surface as well as the Karman vortex configuration in the wake at a certain time are given.Finally,an experiment is carried out to verify the theoretical results.