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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。
Aiming at the problem that the uncertain factors can not be considered in the traditional multidisciplinary design optimization methods, the multidisciplinary design optimization (RBMDO) method based on reliability is studied. Centrifugal compressor impeller is taken as an object, the reliability analysis is made by the improved first order second moment (AFOSM) method considering the influence of random factors such as working conditions and material parameters. Through the double cycle strategy, the multidisciplinary feasible optimization method Reliability analysis, the reasonable introduction of approximation technology, the establishment of a reliability-based multidisciplinary design optimization system. An example of a multidisciplinary reliability optimization design of a centrifugal impeller shows that this method can improve the overall performance of the centrifugal impeller and effectively reduce the design cycle under the premise of meeting all the reliability indexes.