检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
出 处:《计算力学学报》2011年第6期844-850,共7页Chinese Journal of Computational Mechanics
基 金:国家自然科学基金(10572117;50875213);新世纪优秀人才支持计划(NCET-05-0868);航空基金(2007ZA53012);民口863计划课题(2007AA04Z401)资助项目
摘 要:针对工程中同时存在随机和模糊基本变量且随机概率信息不全的可靠性问题,利用Copula理论逼近随机基本变量的联合分布函数和联合概率密度函数,进而建立了Copula逼近基础上的模糊可靠度隶属函数求解的自适应截断抽样法。所建模型在Copula逼近基础上采用优化建模和迭代策略,交替考虑模糊不确定性和随机不确定性对功能函数的影响,求得使功能函数取极值的模糊基本变量取值及随机基本变量设计点,然后再运用自适应截断重要抽样法求得给定隶属度水平下结构可靠度的上、下界,进而得到模糊可靠度隶属函数。所建方法充分利用了Copula函数对概率信息不全的逼近能力和自适应截断抽样法的高效稳健性,使得概率信息不全时的模糊可靠性分析能够高效地被完成。在详细给出建模原理和求解方法后,算例被用来说明模型的合理性和算法的可行性。For engineering reliability problem with fuzzy variables and random variables under incom plete probability information, Copula theory is employed to approximate joint distribution function and joint probability density function of the random variables, on which an adaptive truncated sampling method is established to obtain the membership function of fuzzy reliability. The established model on the Copula approximation can get the value of fuzzy variables and design point which make the performance function take extreme values by optimization and iterating strategy, on which an adaptive truncated sampling is employed to calculate the bounds of the reliability under each given membership level and to get the membership function of the reliability furthermore. In the established method, the advantage of the Copula approximation is combined with the efficiency and robustness of the adaptive truncated sampling, which makes the reliability analysis under incomplete probability information can be completed efficiently. After the model concepts and the solution are given for the established method, several examples are presented to demonstrate the rationality of the model and the feasibility of the solution.
关 键 词:COPULA理论 模糊可靠度 隶属函数 自适应截断抽样
分 类 号:TB114.3[理学—概率论与数理统计] O213.2[理学—数学]
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:3.145.75.74