大中型水轮机主轴过渡段结构的优化分析

The Structural Optimization Analysis of Main Shaft Transition for Large and Medium Hydraulic Turbine

本文通过对多种不同结构方案进行有限元计算，摸清了主轴过渡段结构变化与其根部过渡区最大应为间的关系，得到了在给定结构参数下过渡段的优化结构方案。在此基础上，再以主轴内径和法兰厚度为设计变量进行优化计算，最终确定主轴过渡段的最优结构。通过该项研究，使主轴在满足刚强度要求的前题下，降低材料消耗达20％以上。

The relationship between the maximum stress and the strUcture variation of main shaft transition part was obtained by applying the finite element analysis method. The optimizing model bases on some expecting parameters of transition was selected. From this, choosing flange thickness and internal radius of the main shaft as variables to make further optimum calculation and eventually determines the optimum model of main shaft transition. With the aid of this work,it makes material expend of the main shaft decrease over 20 percent.