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针对涡轮盘在初期设计过程中可利用试验数据少的问题,采用区间模型描述不确定性,以非概率可靠性模型描述可靠性,提出了基于区间不确定性的涡轮盘强度可靠性优化设计方法。同时,为了提高该方法的计算效率,提出两级分阶段构造法,建立非概率可靠性指标关于设计变量的响应面函数,并以此响应面函数表征可靠性约束,从而将可靠性优化设计的双重优化过程转化为单重优化过程,简化了算法结构。典型涡轮盘强度可靠性优化设计算例结果表明,所提方法降低了对试验数据量的需求,且计算成本较低,计算效果较好,能够较好适用于涡轮盘的初期设计。
Aiming at the problem of small test data available in the initial design process of the turbine disk, the interval model is used to describe the uncertainty and the non-probability reliability model to describe the reliability. The method to optimize the reliability of turbine disk reliability based on interval uncertainty is proposed . At the same time, in order to improve the computational efficiency of the proposed method, a two-stage and step-by-step construction method is proposed to establish the response surface function of the non-probabilistic reliability index with respect to the design variables and use the response surface function to characterize the reliability constraints. Double optimization process into single optimization process, simplifying the algorithm structure. The results show that the proposed method reduces the need of experimental data, and the calculation cost is lower, the calculation effect is better, which can be better applied to the initial design of the turbine disk.