航空发动机轮盘结构可靠性全局灵敏度分析

Global Sensitivity Analysis for Turbo-Engine Disk Structures with Uncertainties Based on Failure Probability

基于不确定条件下结构的全局灵敏度分析理论,研究了输入变量的不确定性对航空发动机涡轮盘结构失效概率的影响。考虑涡轮盘结构的材料性能、几何参数及外部边界载荷的不确定性,利用基于失效概率的全局灵敏度分析方法,对航空发动机涡轮盘结构强度可靠度的不确定性来源进行分析,得到输入变量的基于失效概率全局灵敏度排序结果。对某型航空发动机FGH96简化涡轮盘结构进行算例分析,验证了所得排序结果的有效性,可为航空发动机涡轮盘结构可靠性设计提供指导。

Based on the global sensitivity analysis for structures with uncertainties,the contribution of input random variables to failure probability of turbo disk structures is investigated.Considering the uncertainties of mechanical properties of materials,geometric parameters and applied loads,the uncertain propagations of inputs on strength failure probability are analyzed by using failure probability based global sensitivity analysis method.The example of the FGH96 turbine engine disk is investigated to demonstrate the effectiveness of sorting results and illustrated to validate the engineering significance of the global reliability sensitivity indices,which is of benefit to the reliability design of turbine engine disk structures in engineering.