中文摘要：

柔性传动结构在微创手术器械中有着越来越多的应用,由于其结构的复杂性,很多时候难以通过理论计算分析结构的力学性能。提出了一种双螺旋柔性传动结构,利用有限元软件ABAQUS对双螺旋结构建立了有限元模型,并分析了核直径、螺距、壁厚百分比及槽底半径对双螺旋结构扭转刚度的影响。结果表明,随着核直径、螺距、壁厚和槽底半径的增大扭转刚度增大,且在其他参数不变的情况下,扭转刚度随着壁厚百分比基本呈线性变化,这在双螺旋结构的设计中具有重要指导意义。

英文摘要：

The flexible transmission structure have more and more applications in minimally invasive surgical instrument. Due to the complexity of the structure,it is often difficult to calculate the mechanical property by the theoretical analysis of the structure. A double helix flexible transmission structure is proposed and the finite element model of the double helix structure is established in software ABAQUS and the influence of geometrical parameters on torsion stiffness of the double helix structure is analyzed,such as diameter,pitch,wall thickness and bottom radius. The results indicated that with the increase of nuclear diameter,pitch,thickness and bottom radius,the torsional stiffness increases,and with other parameters unchanged,the torsional stiffness and thickness are linear relationship,which has importance guiding significance for the design of the double helix structure.