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arXiv math/0603619math.OCcs.NAmath.NA
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最大加有限元方法求解确定性最优控制问题:基本性质与收敛性分析

The max-plus finite element method for solving deterministic optimal control problems: basic properties and convergence analysis

Marianne Akian, Stephane Gaubert, Asma Lakhoua

AI总结:

本文提出最大加Petrov-Galerkin有限元方法求解有限时域确定性最优控制问题,基于最大加变分公式,证明了误差界由值函数与其在最大加和最小加半模上的投影之差决定,并给出了两种基于哈密顿量的近似及其收敛性分析。

摘要:

我们引入最大加版本的Petrov-Galerkin有限元方法来求解有限时域确定性最优控制问题。该方法依赖于最大加变分公式。我们证明了当刚度矩阵的最大加类比精确已知时,上确界范数下的误差可以由值函数与其在最大加和最小加半模上的投影之差来界定。通常,刚度矩阵必须近似:这需要近似Lax-Oleinik半群在有限元上的作用。我们考虑两种依赖于哈密顿量的近似。我们推导了一个任意维度的收敛性结果,表明对于一类问题,误差估计的量级为$δ+Δx(δ)^{-1}$或$\sqrtδ+Δx(δ)^{-1}$,具体取决于近似的选择,其中$δ$和$Δx$分别是时间和空间离散步长。我们将我们的方法与Fleming和McEneaney先前引入的另一种基于最大加的离散化方法进行了比较。我们给出了1维和2维的数值例子。

英文摘要:

We introduce a max-plus analogue of the Petrov-Galerkin finite element method to solve finite horizon deterministic optimal control problems. The method relies on a max-plus variational formulation. We show that the error in the sup norm can be bounded from the difference between the value function and its projections on max-plus and min-plus semimodules, when the max-plus analogue of the stiffness matrix is exactly known. In general, the stiffness matrix must be approximated: this requires approximating the operation of the Lax-Oleinik semigroup on finite elements. We consider two approximations relying on the Hamiltonian. We derive a convergence result, in arbitrary dimension, showing that for a class of problems, the error estimate is of order $δ+Δx(δ)^{-1}$ or $\sqrtδ+Δx(δ)^{-1}$, depending on the choice of the approximation, where $δ$ and $Δx$ are respectively the time and space discretization steps. We compare our method with another max-plus based discretization method previously introduced by Fleming and McEneaney. We give numerical examples in dimension 1 and 2.

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