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arXiv 2602.05054math.OC
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一种在不确定性下的自适应稳健结构形状优化框架

An Adaptive Framework for Robust Structural Shape Optimization under Uncertainty

Institute of Applied Mathematics, Middle East Technical University(中东理工大学应用数学研究所);ROKETSAN(罗克坦桑);METU(中东理工大学)

Oğuz Han Altıntaş, Hamdullah Yücel

AI总结:

本文提出了一种自适应框架,用于求解由线弹性 governed 的稳健结构形状优化问题,通过后验误差估计器动态调整样本大小、网格分辨率和优化步长,以减少不确定性下的接触合规性。

摘要:

本文提出了一种自适应框架,用于求解由线弹性 governed 的稳健结构形状优化问题,其中加载和材料参数存在不确定性。后验误差估计器用于控制样本大小、网格分辨率和优化步长。在随机梯度近似中,样本大小根据采样形状导数的方差动态调整。在物理域中,所提出的误差估计策略不仅考虑弹性约束的离散化误差,还考虑用于计算下降方向的变形问题的离散化误差。优化步长通过估计随机形状导数的Lipschitz常数自适应确定。此外,建立了随机形状导数的存在性和分布表示。最后,所提出的自适应随机优化框架在类似腿部的结构组件上进行了验证,证明了其在不确定接触力下最小化接触合规性的有效性。

英文摘要:

This work presents an adaptive framework for solving a robust structural shape optimization problem governed by linear elasticity with uncertain loading and material parameters. A posteriori error estimators are constructed to control the sample size, mesh resolution, and optimization step length. The sample size used in the stochastic gradient approximation is adjusted dynamically according to the variance of the sampled shape derivatives. In the physical domain, the proposed error estimation strategy accounts not only for discretization errors in the elasticity constraint but also for errors arising from the discretization of the deformation problem used to compute descent directions. The optimization step length is determined adaptively through an estimate of the Lipschitz constant of the stochastic shape derivative. Moreover, existence results and a distributed representation of the stochastic shape derivative are established. Finally, the proposed adaptive stochastic optimization framework is validated on leg-like structural components, demonstrating its effectiveness in minimizing touchdown compliance under uncertain contact forces.

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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