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arXiv 1706.00632math.OC
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最优控制问题的自适应牛顿算法及其在电极优化设计中的应用

An adaptive Newton algorithm for optimal control problems with application to optimal electrode design

Thomas Carraro, Simon Dörsam, Stefan Frei, Daniel Schwarz

摘要:

本文提出了一种求解非线性约束最优化问题的自适应牛顿型方法,其中约束是用有限元法离散的偏微分方程组。自适应策略是基于一个面向目标的离散化和迭代误差的后验误差估计。迭代误差源于牛顿型方法对一阶非线性系统最优性条件的不精确解。这种策略允许平衡两个错误,并获得有效的停止标准的牛顿迭代。该算法在粗网格上搜索最佳点,只有当离散化误差占主导地位时,粗网格才被细化。使用可计算的误差指标的网格细化本地导致一个高度有效解的过程。该算法的性能示出了几个例子,特别是在神经科学中的应用:神经网络研究的最佳电极设计。

英文摘要:

In this work we present an adaptive Newton-type method to solve nonlinear constrained optimization problems in which the constraint is a system of partial differential equations discretized by the finite element method. The adaptive strategy is based on a goal-oriented a posteriori error estimation for the discretization and for the iteration error. The iteration error stems from an inexact solution of the nonlinear system of first order optimality conditions by the Newton-type method. This strategy allows to balance the two errors and to derive effective stopping criteria for the Newton-iterations. The algorithm proceeds with the search of the optimal point on coarse grids which are refined only if the discretization error becomes dominant. Using computable error indicators the mesh is refined locally leading to a highly efficient solution process. The performance of the algorithm is shown with several examples and in particular with an application in the neurosciences: the optimal electrode design for the study of neuronal networks.

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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