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arXiv 2407.06969math.OC
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最小时间问题的半拉格朗日格式的收敛性与误差估计

Convergence and Error Estimates of A Semi-Lagrangian scheme for the Minimum Time Problem

Marianne Akian, Shanqing Liu

AI总结:

该研究针对最小时间问题的半拉格朗日格式,分别通过确定性和随机最优控制解释推导时间离散及全离散的1阶收敛率,拓展至状态约束问题并用于分析快速行进法的收敛性与复杂度。

摘要:

我们研究一种用于求解带给定目标的最小时间问题及相关程函型方程的半拉格朗日格式。首先,我们对时间离散格式采用离散时间确定性最优控制问题的解释,并证明在动力学和目标集边界满足正则性假设的条件下,离散时间值函数是半凹的。基于该半凹性质,我们建立了按时间步长计为1阶的收敛速率。随后,我们对完全离散格式采用离散时间随机最优控制的解释,在更强的正则性假设下,利用特定插值算子建立了按时间步长和空间步长计均为1阶的收敛速率。我们将收敛结果推广到带特定状态约束的问题,还将结果用于分析fast-marching method(快速行进法)的收敛速率与计算复杂度,同时也探讨了作者近期提出的multi-level fast-marching method(多层快速行进法)。

英文摘要:

We consider a semi-Lagrangian scheme for solving the minimum time problem, with a given target, and the associated eikonal type equation. We first use a discrete time deterministic optimal control problem interpretation of the time discretization scheme, and show that the discrete time value function is semiconcave under regularity assumptions on the dynamics and the boundary of target set. We establish a convergence rate of order $1$ in terms of time step based on this semiconcavity property. Then, we use a discrete time stochastic optimal control interpretation of the full discretization scheme, and we establish a convergence rate of order $1$ in terms of both time and spatial steps using certain interpolation operators, under further regularity assumptions. We extend our convergence results to problems with particular state constraints. We apply our results to analyze the convergence rate and computational complexity of the fast-marching method. We also consider the multi-level fast-marching method recently introduced by the authors.

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