极限状态数据对构建结构可靠性分析精确替代模型的影响

IF 3 3区 工程技术 Q2 ENGINEERING, MECHANICAL Probabilistic Engineering Mechanics Pub Date : 2024-03-12 DOI:10.1016/j.probengmech.2024.103595
Nhu Son Doan , Huu-Ba Dinh
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引用次数: 0

摘要

工程问题主要是在隐含过程中定义的;因此,完全概率分析,如蒙特卡罗模拟(MCS),实施起来非常昂贵。在实践中,有两种方法可以解决这个问题,一是缩小模拟规模,二是开发实际问题的替代模型。后者不会牺牲 MCS 的大小,而且对概率计算的深入了解要求较低;因此,大多数工程师更倾向于后者。本研究提出了一个有效的框架,通过考虑极限状态边缘数据(LS 数据)来开发可靠、准确的代用模型。针对与可靠性分析有关的大多数问题,包括非线性性能函数、多重失效模式和隐式定义问题,研究了在训练过程中考虑 LS 数据的效果以及所建议的元模型的性能。为了证明所提方法的能力,采用了两种机器学习算法,包括人工神经网络和高斯过程。研究表明,极限状态数据在建立准确的可靠性分析代用模型方面发挥着至关重要的作用,将这些数据积累到训练数据集中有助于快速构建准确的元模型。这项工作为可靠性分析提供了一个实用框架,因为无需深入了解概率计算,就能轻松检测 LS 数据。
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Effects of limit state data on constructing accurate surrogate models for structural reliability analyses

Engineering problems are mainly defined in implicit processes; hence, the fully probabilistic analyses, e.g., Monte Carlo simulations (MCS), are expensive to implement. In practice, two approaches to overcome the issues are either reducing the size of simulations or developing surrogate models for actual problems. The latter does not sacrifice the size of MCS and requires less insight into probabilistic calculation; hence, it is preferable to most engineers. This study proposes an efficient framework to develop reliable and accurate surrogate models by considering data at the limit state margins (LS data). Effects of involving LS data in the training process and performances of the proposed metamodels are investigated for most issues relating to reliability analyses, including nonlinear performance functions, multiple failure modes, and implicitly defined problems. Two machine learning algorithms, including artificial neural networks and the Gaussian process, are employed to prove the ability of the proposed method. Investigations reveal that the limit state data plays a vital role in developing accurate surrogate models for reliability analyses, and accumulating them into the training dataset helps quickly construct accurate metamodels. This work contributes a practical framework for reliability analyses because the LS data can be detected easily without insight into probabilistic calculations.

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来源期刊
Probabilistic Engineering Mechanics
Probabilistic Engineering Mechanics 工程技术-工程:机械
CiteScore
3.80
自引率
15.40%
发文量
98
审稿时长
13.5 months
期刊介绍: This journal provides a forum for scholarly work dealing primarily with probabilistic and statistical approaches to contemporary solid/structural and fluid mechanics problems encountered in diverse technical disciplines such as aerospace, civil, marine, mechanical, and nuclear engineering. The journal aims to maintain a healthy balance between general solution techniques and problem-specific results, encouraging a fruitful exchange of ideas among disparate engineering specialities.
期刊最新文献
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