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| A decoupling method of structural reliability optimization based on threshold factor |
| Received:December 05, 2017 Revised:April 16, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20171205001 |
| KeyWord:structural reliability reliability-based design optimization decoupling threshold factor most possible failure point |
| Author | Institution |
| 赵维涛 |
沈阳航空航天大学 航空航天工程学部, 沈阳 |
| 李久安 |
沈阳航空航天大学 航空航天工程学部, 沈阳 |
| 祁武超 |
沈阳航空航天大学 航空航天工程学部, 沈阳 |
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| Abstract: |
| A concept of threshold factor is introduced based on the theory of structural reliability in this study.Its physical meaning is the magnitude of the threshold that must be adjusted so that the current optimal solution can satisfy the reliability constraints.The threshold factor approaches 1 for the active constraint with the progress of iterations,which can shift the most possible failure point to the limit state surface that satisfies the reliability constraints,and thus the optimization efficiency is improved.In the proposed method, the design variables can be random variables or non-random variables,and the decomposition method of design variables is used to solve the optimization model when design variables are random variables.Numerical results indicate that the proposed method is not sensitive to the decomposition method,satisfactory results can be obtained for both active and inactive constraints,and the computational efficiency of the proposed method is higher than that of the classical method. |