基于蝉口针形态的仿生针头结构优化设计及减阻机理分析

Optimum structural design and analysis of drag reduction mechanism of bionic needles inspired by cicada stylet

基于蝉上颚口针表面的非光滑结构形态,结合对蝉口针刺入机理的分析,设计出锯齿形仿生针头。采用二元二次回归正交组合试验优化设计方法,研究了锯齿宽度、锯齿间距这两个仿生结构参数对针头穿刺阻力的影响规律,求取了回归方程。得到最优仿生锯齿形针头的结构参数为:锯齿宽度0.3mm、锯齿间距2.5mm,减阻率为43.21%。锯齿形仿生针头通过减小接触面积、形成滚动轴承模型和产生微震的方式实现减阻效果,为无痛仿生针头的研制提供了依据。

The penetration mechanism of the mandibular stylet of cicada with non-smooth shape is analyzed. A bionic needle with saw tooth, which is inspired by cicada stylet is designed. The binary quadratic regression and orthogonal combination test optimization design method are employed to research the influences of two bionic structural parameters, the width of serrate and the interval of serrate, on the puncture resistance of syringe needle. A regression equation of the cicada stylet is obtained. The structure parameters of the optimal bionic saw tooth needle are that the width of serrate is 0.3 mm and the interval of serrate is 2.5 mm, and its drag reduction rate is 43.21%. The drag reduction effect of the saw tooth bionic needles is attributed to the decreasing contact area, forming rolling bearing model and producing microseism. This study provides the basis for the development of bionic painless needles.