针对传统多学科设计优化方法中未能考虑不确定因素的问题,开展基于可靠性的多学科设计优化(RBMDO)方法的研究。以离心式压气机叶轮为对象,综合考虑工作状况和材料参数等随机性因素的影响,利用改进的一次二阶矩(AFOSM)法进行可靠性分析,通过双循环策略将多学科可行优化方法与可靠性分析相结合,合理引入近似技术,建立了基于可靠性的多学科设计优化系统。对某离心叶轮进行多学科可靠性优化设计的算例表明,在满足所有可靠性指标的前提下,该方法可实现离心叶轮综合性能的提高,并有效地缩减设计周期。
In order to take into consideration the effect of uncertainty factors on system performance, a reliability-based multidisciplinary design optimization (RBMDO) method is applied to centrifugal impeller design and a system is set up to accomplish the entire analysis process. The uncertainties of boundary conditions and material parameters of a centrifugal impeller are considered. The advanced first order and second moment (AFOSM) method is used to perform reliability analysis. Double-loop strategy is employed to integrate multidisciplinary feasible design optimization and reliability analysis. With the introduction of rational approximation, the RBMDO is established. The case study shows that the system can obviously improve the performance of a centrifugal impeller with high calculation efficiency, which validates the feasibility of the RBMDO method in centrifugal impeller design.
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