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为解决传统的基于可靠性的多学科设计优化(RBMDO)由于存在优化过程多层嵌套、多学科分析和可靠性分析反复迭代而导致的低效率问题,提出集成两级集成系统协同优化(BLISCO)策略和改进功能测度法(iPMA)的多学科可靠性设计优化方法。首先,基于序列化思想将多学科可靠性设计优化解耦,避免了每次多学科设计优化(MDO)对完整可靠性分析模型的反复调用与迭代。其次,采用高效的更适合复杂工程组织形式的BLISCO策略进行确定性多学科设计优化,摒弃了协同优化的一致性约束和两级集成系统综合法的复杂分析和近似建模问题,提高了计算效率。然后,基于角度更新策略对功能测度法(PMA)进行改进,采用更新角度替代极限状态函数值进行可靠性分析与判别,减少了多学科可靠性分析次数。最后,结合某机型起落架的缓冲器设计实例对所提方法进行验证,结果表明该方法的计算效率较其他方法分别提高了30.93%和19.97%,验证了方法的有效性,且具有工程实用价值。
In order to solve the inefficiency problem of traditional reliability-based multidisciplinary design optimization (RBMDO) due to iterative iterations of multi-level nested optimization, multidisciplinary analysis and reliability analysis, an integrated two-level integrated system collaborative optimization (BLISCO Multi-disciplinary Reliability Design Optimization Methodology for Strategy and Improved Functional Measurement (iPMA). First, based on the idea of serialization, multidisciplinary reliability design optimization is decoupled, which avoids the repeated invocation and iteration of multi-disciplinary design optimization (MDO) on the complete reliability analysis model. Second, the BLISCO strategy, which is more efficient and suitable for complex engineering organization, is used to carry out deterministic multidisciplinary design optimization. The problem of the consistency analysis of the synergetic optimization and the complex analysis and approximate modeling of the two-level integrated system synthesis method is abandoned and the computational efficiency is improved. . Then, based on the angle updating strategy, the functional measurement method (PMA) is improved, and the reliability analysis and discrimination are replaced by the updated angle instead of the limit state function value, which reduces the number of multidisciplinary reliability analysis. Finally, the proposed method is validated by the example of the design of the buffer of a landing gear. The results show that the computational efficiency of this method is improved by 30.93% and 19.97% respectively compared with other methods, which verifies the effectiveness of the method and has practical engineering value.