螺旋驱动血管机器人外结构参数优化

The Outer Structure Parameter Optimization of the Vascular Robot with Screw-driven

为了改善螺旋驱动血管机器人运动性能,对其外结构参数进行数值优化.对不同螺旋参数(螺旋线数、螺旋升角、螺宽与螺距之比)的血管机器人外流场进行数值模拟比较分析,得到优化后的外形参数分别为:螺旋线数6,外径8mm,轴向长度15mm,螺宽1.13mm,螺高0.8mm,螺升角45°.计算结果表明,优化后的血管机器人结构的轴向推动力增加了4.69倍,而液体阻力矩仅增加了0.18倍.

In order to improve the motion performance of the screw-driven vascular robot,its outer structure parameters are optimized by numerical simulation.Through comparative analysis of the outer flow field of vascular robot with different helical parameters （the thread number,the angle of pitch,the ratio of the width and pitch）,the optimized helical parameters are as follows：the threads number is 6,the outer diameter of 8 mm,the axial length of 15 mm,width of 1.13 mm,thread height of 0.8 mm,the angle of pitch is 45°.The results show that the axial thrust of vascular robot with optimized structure increases 4.69 times,and the fluid drag torque increases by only 0.18 times.