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| Three-stage decoupling method of reliability-based design optimization |
| Received:October 09, 2016 Revised:December 07, 2016 |
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| DOI：10.7511/jslx20161009002 |
| KeyWord:reliability-based design optimization decoupling safety factor sensitivity weight factor |
| Author | Institution |
| 赵维涛 |
沈阳航空航天大学 辽宁省飞行器复合材料结构分析与仿真重点实验室, 沈阳 |
| 王建业 |
沈阳航空航天大学 辽宁省飞行器复合材料结构分析与仿真重点实验室, 沈阳 |
| 祁武超 |
沈阳航空航天大学 辽宁省飞行器复合材料结构分析与仿真重点实验室, 沈阳 |
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| Abstract: |
| In order to improve the efficiency of reliability-based design optimization (RBDO),a three-stage decoupling method is proposed in this paper.In the first stage,the deterministic optimization based on the reliability safety factor is used to find an optimal design,and the optimal design is chosen as an initial sample point.In the second stage,sample points are adjusted by using reliability sensitivities and a weight factor,and a data set between the objective function and the failure probability is obtained.In the third stage,the objective function corresponding to the acceptable failure probability is extracted by using a relationship curve between the objective function and the failure probability,and final optimization design variables are obtained.The deterministic optimization is used only one time in the proposed method,and all classical algorithms of structural reliability can be used for the proposed method.The adaptability of the proposed method is strong.The numerical results show that the proposed method can obviously reduce the number of evaluation of failure probability,and results are not sensitive to the reliability safety factor and weight factor. |
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