共查询到16条相似文献,搜索用时 93 毫秒
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将可靠性优化设计理论、可靠性灵敏度技术和稳健设计方法相结合,讨论了具有任意分布参数的机械零件的可靠性稳健设计问题,提出了可靠性稳健设计的计算方法.把可靠性灵敏度融入可靠性优化设计模型之中,将可靠性稳健设计归结为满足可靠性要求的多目标优化问题.在基本随机参数的前四阶矩已知的情况下,通过计算机程序可以实现具有任意分布参数的机械零件的可靠性稳健设计,迅速准确地得到具有任意分布参数的机械零件的可靠性稳健设计信息。 相似文献
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将可靠性优化设计理论与可靠性灵敏度分析方法相结合,讨论了机械零部件稳健优化设计的问题.系统地推导了基于鞍点逼近的可靠性灵敏度公式,并把可靠性灵敏度计算结果融入可靠性稳健优化设计模型之中,将可靠性稳健优化设计归结为满足可靠性要求的多目标优化问题.在基本随机参数概率分布已知的前提下,应用鞍点逼近技术,得到极限状态函数的分布函数与概率密度函数,并且将此结果应用到机械零部件的可靠性灵敏度分析中,进而实现了机械零部件的可靠性稳健优化设计.通过与Monte-Carlo方法计算所得的结果相比可知,应用鞍点逼近技术可以迅速、准确地得到机械零部件可靠性稳健设计信息. 相似文献
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《振动与冲击》2017,(15)
以一种新型微操作平台为对象,考虑其结构参数的随机波动,提出一种基于6σ稳健设计思想和响应面法的可靠性稳健优化设计思路。采用筛选实验设计方法确定设计变量,采用中心组合试验设计方法建立反映平台性能指标的响应面模型。基于该模型采用一次二阶矩法得到反映平台可靠性和稳健性的性能指标,即平台位移放大倍数、固有频率和可靠性灵敏度的概率分布及可靠度。基于6σ稳健设计思想建立以平台位移放大倍数、固有频率和可靠性灵敏度的稳健性为目标,平台可靠度为约束的可靠性稳健优化模型,采用序列二次规划法对平台进行优化。将稳健优化和确定性优化结果进行比较分析可知,平台位移放大倍数、固有频率和可靠性灵敏度的方差分别减小了40.9%、49.4%、33.6%,可靠度由61.36%提高到99.78%,实现了可靠性稳健优化的设计要求,说明了设计思路和理论模型的有效性。 相似文献
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建立了基于可靠度的平台模糊优化设计模型。探讨了导管架平台结构主要失效模式和平台结构期望失效费用的确定方法,对平台构件及结构体系可靠性指标进行了灵敏度分析,给出了平台结构可靠性模糊优化设计流程。以胜利油川坦北采油平台为例进行可靠性模糊优化设计,并与确定性优化设计结果进行比较,算例结果显示进行可靠性模糊优化设计是非常必要的。 相似文献
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Zhou Yang Unsong Pak Cholu Kwon Yimin Zhang 《Quality and Reliability Engineering International》2023,39(1):454-471
To decrease random parameters’ influence on the drum brake reliability, the reliability-based robust optimization design (RBROD) of the electric vehicle brake is proposed. Based on the assumption that the maximum temperature of the brake cannot exceed the allowable temperature, a performance function model of thermal–mechanical coupling reliability of drum brakes is established by the adaptive Kriging method, and the analysis of reliability sensitivity and RBROD are conducted. The accuracy of the proposed model is verified by temperature measurement experiment under emergency braking condition. The robust optimization design improves the drum brake reliability to 0.99998 and reduce the influence of the design parameters on the reliability, with the absolute values of the reliability sensitivity and the weight of the drum brake are significantly smaller. Therefore, the objectives of reliability design, robustness design, and optimization design are simultaneously achieved by the proposed methods. Besides, the relative error of the proposed method is 0.373%, the number of function evaluations is 39, and the comparison with four meta-model methods show that the proposed method holds high-accuracy and high-efficiency. This study provides a high-precision theoretical explanation for the robust optimization design of drum brake. 相似文献
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在贝叶斯统计理论和结构可靠性优化设计方法的基础上,研究了结构在小样本情况下考虑可靠度可信区间的结构可靠性优化设计问题.将结构可靠度作为随机变量,根据先验信息和样本信息,采用贝叶斯推断技术获得结构可靠度的概率分布,给出了可靠度的点估计及区间估计.建立了考虑可靠度可信区间的结构可靠性优化设计模型,提出了考虑可靠度可信区间的结构可靠性优化设计方法.所提出的方法为解决小样本情况下的结构可靠性优化设计问题提供了新的解决方案.数值算例验证了所提出的结构可靠性优化设计方法的有效性和正确性. 相似文献
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《工程优选》2012,44(1):1-21
ABSTRACTProbabilistic and non-probabilistic methods have been proposed to deal with design problems under uncertainties. Reliability-based design and robust design are probabilistic strategies traditionally used for this purpose. In the present contribution, reliability-based robust design optimization (RBRDO) is formulated as a multi-objective problem considering the interaction of both approaches. The proposed methodology is based on the differential evolution algorithm associated with two strategies to deal with reliability and robustness, respectively, namely inverse reliability analysis and the effective mean concept. This multi-objective optimization problem considers the maximization of reliability and robustness coefficients as additional objective functions. The effectiveness of the methodology is illustrated by two classical test cases and a rotor-dynamics application. The results demonstrate that the proposed methodology is an alternative method to solve RBRDO problems. 相似文献