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Dynamic reliability analysis model for structure with both random and interval uncertainties
International Journal of Mechanics and Materials in Design ( IF 2.7 ) Pub Date : 2018-11-17 , DOI: 10.1007/s10999-018-9427-4
Yan Shi , Zhenzhou Lu

Aiming at analyzing the safety of the dynamic structure involving both input random variables and the interval ones, a new dynamic reliability analysis model is presented by constructing a second level limit state function. Two steps are involved in the construction of the dynamic reliability model. In the first step, the non-probabilistic reliability index is firstly extended to the dynamic structure, in which the uncertainties of interval inputs can be analyzed by fixing random inputs and time parameter. In the second step, the second level limit state function is constructed by considering the fact that the non-probabilistic reliability index larger than one corresponds to the safe state, in which the uncertainties of random inputs are taken into account. Generally, the actual reliability of dynamic structure with both random and interval inputs is an interval variable, and theoretic analysis illustrates that the proposed reliability is equivalent to the lower bound of the actual reliability, which can provide an efficient way for measuring the safety of dynamic structure. For estimating the proposed reliability, a double-loop optimization algorithm combined with Monte Carlo Simulation as well as the active learning Kriging method is established. Several examples involving a cylindrical pressure vessel, an automobile front axle and a planar 10-bar structure are introduced to illustrate the validity and significance of the established reliability model and the efficiency and accuracy of the proposed solving procedure.



中文翻译:

具有随机和区间不确定性的结构动态可靠性分析模型

为了分析同时包含输入随机变量和区间变量的动态结构的安全性,通过构造第二级极限状态函数,提出了一种新的动态可靠性分析模型。动态可靠性模型的构建涉及两个步骤。第一步,首先将非概率可靠性指标扩展到动态结构,通过固定随机输入和时间参数可以分析区间输入的不确定性。在第二步骤中,通过考虑以下事实来构造第二级别极限状态函数:非概率可靠性指标大于1对应于安全状态,其中考虑了随机输入的不确定性。通常,随机输入和间隔输入的动力结构的实际可靠度是一个区间变量,理论分析表明,所提出的可靠度等于实际可靠度的下限,可以为动态结构的安全性提供一种有效的测量方法。为了估计所提出的可靠性,建立了与蒙特卡洛模拟相结合的双环优化算法以及主动学习克里格法。介绍了几个涉及圆柱压力容器,汽车前轴和平面10杆结构的示例,以说明所建立的可靠性模型的有效性和重要性以及所提出的求解过程的效率和准确性。理论分析表明,所提出的可靠度等于实际可靠度的下限,可以为动态结构的安全性提供一种有效的测量方法。为了估计所提出的可靠性,建立了与蒙特卡洛模拟相结合的双环优化算法以及主动学习克里格法。介绍了几个涉及圆柱压力容器,汽车前轴和平面10杆结构的示例,以说明所建立的可靠性模型的有效性和重要性以及所提出的求解过程的效率和准确性。理论分析表明,所提出的可靠度等于实际可靠度的下限,可以为动态结构的安全性提供一种有效的测量方法。为了估计所提出的可靠性,建立了与蒙特卡洛模拟相结合的双环优化算法以及主动学习克里格法。介绍了几个涉及圆柱压力容器,汽车前轴和平面10杆结构的示例,以说明所建立的可靠性模型的有效性和重要性以及所提出的求解过程的效率和准确性。建立了结合蒙特卡罗模拟的双环优化算法和主动学习克里格法。介绍了几个涉及圆柱压力容器,汽车前轴和平面10杆结构的示例,以说明所建立的可靠性模型的有效性和重要性以及所提出的求解过程的效率和准确性。建立了结合蒙特卡罗模拟的双环优化算法和主动学习克里格法。介绍了几个涉及圆柱压力容器,汽车前轴和平面10杆结构的示例,以说明所建立的可靠性模型的有效性和重要性以及所提出的求解过程的效率和准确性。

更新日期:2018-11-17
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