基于一阶优化方法的球形岔管体形优化

Shape Optimization of Spherical Branch Pipe Based on First-order Optimization Method

针对传统设计中球形岔管安全系数偏大造成体形笨重及加工制作困难的问题,结合某高水头电站,在合理的几何约束和强度约束条件下建立了球形岔管的数学模型,利用ANSYS一阶优化方法对该数学模型进行优化求解得到最优方案,并对优化前后的岔管结构进行三维有限元计算分析。结果表明,优化后球形岔管在整体应力分布及变形控制等方面均优于原设计方案,减小了偏心受力引起的变形和应力集中现象,不仅减少了钢材用量,且降低了制造成本和难度。

To solve the problem that traditional design of spherical bifurcation pipe caused extra safety factor and large pipe shape, taking a certain high head hydroelectric station as example, a mathematical model was established under the control of geometric constraints and strength constraints. And then, first-order optimization method in ANSYS was used to optimize the shape of spherical branch pipe and a optimal case was achieved. Three-dimensional finite element method was adopted to analyze the structure of bifurcation pipe before and after optimization. The results indicate that after the optimization, the whole stress strength distribution and deformation control are improved; the deformation and stress concentration caused by the eccentric force are reduced; steel volume of spherical branch pipe and the cost of manu facture are decreased.