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应用随机摄动技术与二阶矩方法,结合概率网络估算法(Probability Network Evaluation Technique),讨论了多失效模式下结构系统的可靠性和可靠性灵敏度问题,并进一步对结构系统的可靠性稳健设计进行了分析。获得了不同失效模式间的相关统计特性,应用概率网络估算法确定了系统的代表失效模式,得出了结构系统可靠度和可靠性灵敏度;在可靠性优化设计模型中引入可靠性灵敏度,将结构系统可靠性稳健设计转化为满足系统可靠性要求的多目标优化问题;提出了多失效模式下结构系统可靠性分析与可靠性稳健设计的数值方法;通过工程实例验证了该文所述方法的实用性和有效性。
The stochastic perturbation technique and the second moment method are combined with the Probability Network Evaluation Technique to discuss the reliability and reliability sensitivity of the structural system under multi-failure mode. The robust design of the structural system reliability is further discussed Analyzed. Obtained the statistical properties of different failure modes, and used the probabilistic network estimation method to determine the representative failure modes of the system, and obtained the reliability of the reliability and reliability of the structural system. By introducing the reliability sensitivity into the reliability optimization design model, The system reliability robust design is transformed into a multi-objective optimization problem that meets the requirements of system reliability. A numerical method of structural system reliability analysis and reliability robust design in multi-failure mode is proposed. The practical application of the method described in this paper is verified through engineering examples Sexuality and effectiveness.