Abstract
Reliability-based design optimization has gained much attention in many engineering design problems with the consideration of uncertainties. Nevertheless, the application is limited by the huge computational cost for the repeated reliability analysis in the optimization process. To address this issue, an iterative reliable design space approach is proposed with less number of reliability analysis required. Specifically, a sequential optimization strategy is proposed to identify the iterative reliable design space and perform the equivalent deterministic optimization in a serial loop. Thus, the identification of the reliable design space, which is time-consuming, is eliminated from the equivalent probabilistic constraints. Furthermore, an improved shifting vector strategy is put forward for the identification. In this strategy, an approximate shifting vector is first constructed utilizing the partial derivatives at the current design point, and it is then modified based on an increment of the shifting vector and a correction provided by the true reliability analysis. Besides, several mathematical examples and engineering problems are tested to validate the performance of the proposed method. In conclusion, the proposed method is able to deal with different kinds of nonlinear problems with relatively high accuracy and efficiency.
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Acknowledgements
This research is supported by the National Natural Science Foundation of China under Grant Nos. 51675198, 51721092, the National Natural Science Foundation for Distinguished Young Scholars of China under Grant No. 51825502, and the Program for HUST Academic Frontier Youth Team.
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Jiang, C., Qiu, H., Li, X. et al. Iterative reliable design space approach for efficient reliability-based design optimization. Engineering with Computers 36, 151–169 (2020). https://doi.org/10.1007/s00366-018-00691-z
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DOI: https://doi.org/10.1007/s00366-018-00691-z