Reliability-based multidisciplinary design optimization of centrifugal impeller with double-loop strategy

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.