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arXiv 1408.2222eess.SYcs.SYmath-phmath.MP
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线性随机系统的最优控制以达到最终概率分布

Optimal steering of a linear stochastic system to a final probability distribution

University of Minnesota(明尼苏达大学);Università di Padova(帕多瓦大学)

Yongxin Chen, Tryphon Georgiou, Michele Pavon

AI总结:

本文研究如何通过最小能量控制将线性随机系统从初始高斯分布引导至最终分布,提出了一种基于李雅普诺夫方程的显式状态反馈控制方法,为一般高斯-马尔可夫过程提供了可实现的最优控制方案。

摘要:

我们考虑将具有完全状态观测的线性动力系统从状态空间中的初始高斯分布引导至最终分布的问题,通过控制通道进行随机驱动;例如,惯性粒子受到随机“白噪声”驱动。我们证明目标概率分布总能在有限时间内达到。最优控制以状态反馈形式给出,并通过求解一对耦合通过边界值的微分李雅普诺夫方程显式计算。该结果因其吸引人的算法性质,可能应用于纳米机械系统主动控制和分子冷却。将扩散过程引导至端点边际的问题有长期历史(Schrödinger桥梁),因此当前线性随机系统引导问题构成了一种可能退化扩散的Schrödinger桥梁。然而,我们的结果为一般高斯-马尔可夫过程提供了首个可实现的最优控制形式。惯性粒子和随机振子的最优演化和控制示例被提供。最终结果直接建立了Schrödinger桥梁作为给定边际之间最可能随机演化的性质,应用于线性随机系统。

英文摘要:

We consider the problem to steer a linear dynamical system with full state observation from an initial gaussian distribution in state-space to a final one with minimum energy control. The system is stochastically driven through the control channels; an example for such a system is that of an inertial particle experiencing random "white noise" forcing. We show that a target probability distribution can always be achieved in finite time. The optimal control is given in state-feedback form and is computed explicitely by solving a pair of differential Lyapunov equations that are coupled through their boundary values. This result, given its attractive algorithmic nature, appears to have several potential applications such as to active control of nanomechanical systems and molecular cooling. The problem to steer a diffusion process between end-point marginals has a long history (Schrödinger bridges) and therefore, the present case of steering a linear stochastic system constitutes a Schrödinger bridge for possibly degenerate diffusions. Our results, however, provide the first implementable form of the optimal control for a general Gauss-Markov process. Illustrative examples of the optimal evolution and control for inertial particles and a stochastic oscillator are provided. A final result establishes directly the property of Schrödinger bridges as the most likely random evolution between given marginals to the present context of linear stochastic systems.

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