论文标题

拓扑状态衍生物:拓扑优化的最佳控制观点

The topological state derivative: an optimal control perspective on topology optimisation

论文作者

Baumann, Phillip, Mazari-Fouquer, Idriss, Sturm, Kevin

论文摘要

在本文中,我们介绍了用于一般拓扑扩张的拓扑状态衍生物,并探讨了其与标准最佳控制理论的关系。我们表明,对于一类偏微分方程,相对于拓扑的形状依赖性状态变量可以分化,从而导致线性化系统类似于标准最佳控制问题中发生的系统。但是,在处理该线性化系统的解决方案的规律性时,必须小心。实际上,我们应该期望(非常)弱解决方案的不同概念,具体取决于操作员的主要部分还是其低阶条款受到干扰。我们还研究了与拓扑状态衍生物的关系,该关系通常是通过涉及边界层校正器的经典拓扑扩展获得的。拓扑状态衍生物的一个特征是它可以通过Stampacchia型规律性估算得出,也可以通过经典的渐近扩展来得出。应当指出的是,我们的方法足够灵活,足以涵盖域的点扰动的通常情况。特别是,在[8,9]的线上,我们处理形状的更一般扩张,从而在曲线,表面或超丘面中产生拓扑衍生物。为了绘制与通常用伴随方程式表达的常规拓扑衍生物的连接,我们展示了如何使用拓扑态衍生物轻松地计算形状功能的一阶拓扑衍生物。

In this paper we introduce the topological state derivative for general topological dilatations and explore its relation to standard optimal control theory. We show that for a class of partial differential equations, the shape dependent state variable can be differentiated with respect to the topology, thus leading to a linearised system resembling those occurring in standard optimal control problems. However, a lot of care has to be taken when handling the regularity of the solutions of this linearised system. In fact, we should expect different notions of (very) weak solutions, depending on whether the main part of the operator or its lower order terms are being perturbed. We also study the relationship with the topological state derivative, usually obtained through classical topological expansions involving boundary layer correctors. A feature of the topological state derivative is that it can either be derived via Stampacchia-type regularity estimates or alternately with classical asymptotic expansions. It should be noted that our approach is flexible enough to cover more than the usual case of point perturbations of the domain. In particular, and in the line of [8,9], we deal with more general dilatations of shapes, thereby yielding topological derivatives with respect to curves, surfaces or hypersurfaces. In order to draw the connection to usual topological derivatives, which are typically expressed with an adjoint equation, we show how usual first order topological derivatives of shape functionals can be easily computed using the topological state derivative.

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