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arXiv 1104.3479stat.MEstat.AP
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基于自适应Kriging元模型的几何不确定壳体可靠性优化设计

Reliability-based design optimization of shells with uncertain geometry using adaptive Kriging metamodels

V. Dubourg, J. -M. Bourinet, B. Sudret

摘要:

在过去的十年中,由于制造商以最低的成本建立鲁棒系统的需求不断增加,不确定性下的优化设计得到了广泛的关注。基于可靠性的设计优化(RBDO)允许分析人员最小化一些成本函数,同时确保一些最小的性能铸造作为一组性能函数的容许故障概率。为了解决其中通过计算模型(例如,结构力学中的有限元模型)元建模技术在过去的十年中得到了发展。本文引入自适应Kriging代理模型来解决RBDO问题。后者被铸造在一个增强的空间,“总结”的范围内的设计空间和偶然的不确定性的设计参数和环境条件。代理模型用于(i)评估失效概率的稳健估计(并通过自适应采样增强计算试验设计)以达到所需的精度,以及(ii)应用基于梯度的优化算法以获得设计参数的最优值。将该方法应用于潜艇工程用环肋圆柱壳在不确定几何缺陷下的优化设计。对于这种应用程序的结构的性能有关的屈曲,这是解决这里通过有限元解的基础上的渐近数值方法。

英文摘要:

Optimal design under uncertainty has gained much attention in the past ten years due to the ever increasing need for manufacturers to build robust systems at the lowest cost. Reliability-based design optimization (RBDO) allows the analyst to minimize some cost function while ensuring some minimal performances cast as admissible failure probabilities for a set of performance functions. In order to address real-world engineering problems in which the performance is assessed through computational models (e.g., finite element models in structural mechanics) metamodeling techniques have been developed in the past decade. This paper introduces adaptive Kriging surrogate models to solve the RBDO problem. The latter is cast in an augmented space that "sums up" the range of the design space and the aleatory uncertainty in the design parameters and the environmental conditions. The surrogate model is used (i) for evaluating robust estimates of the failure probabilities (and for enhancing the computational experimental design by adaptive sampling) in order to achieve the requested accuracy and (ii) for applying a gradient-based optimization algorithm to get optimal values of the design parameters. The approach is applied to the optimal design of ring-stiffened cylindrical shells used in submarine engineering under uncertain geometric imperfections. For this application the performance of the structure is related to buckling which is addressed here by means of a finite element solution based on the asymptotic numerical method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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