通用过渡圆弧改进设计与榫齿连接结构多变量优化

为了得到更加优良的榫齿连接结构形式,降低榫齿连接结构应力集中水平,提高其疲劳强度,研究了双圆弧过渡对榫齿连接结构应力的影响,推导了通用双圆弧过渡的尺寸关系式,为过渡圆弧的改进与优化提供了理论上的支持.通过对二齿涡轮枞树形榫齿连接结构过渡圆弧的改进,并进行了应力评估,证明了双圆弧过渡结构确实能降低结构的应力集中水平.基于Isight软件平台,利用二次序列非线性优化(NLQPL)方法对榫齿连接结构进行了多变量优化,得到了更加优良的结构形式,最大等效应力下降了19.98%. 

General transition arcs redesign and multivariable optimization of tenon-mortise joints

In order to obtain a better structure type and reduce stress concentration to achieve better fatigue strength, the dual arcs transition on tenon-mortise joints was examined to find out its influence on stress distribution. Geometric restrictions on dual arcs transition were derived to support design optimization and modifications. Dual arcs transition were employed on two-teeth tenon-mortise joints of turbine disk and the stress assessment on the structure was performed. The dual arcs transition was proved effective in reducing stress concentration and improving structure strength. Multivariable optimization is carried out based on Isight platform using non-linear quadratic programming language (NLQPL) method. Better structural parameters are achieved to reduce stress concentration, and the maximum stress decreases by 19.98%.