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arXiv 2109.15064math.OCcs.SYeess.SY
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连续时间Optimization的瞬时收敛性和定时收敛性

Finite-time and Fixed-time Convergence in Continuous-time Optimization

Yuquan Chen, Yiheng Wei, YangQuan Chen

摘要:

众所周知,梯度法可以被看作是一个动态系统,其中各种迭代方案可以被设计为具有期望性质的闭环系统的一部分。本文主要研究连续时间优化问题的有限时间收敛性和固定时间收敛性。利用滑模控制的优点,提出了一种有限时间梯度法,其收敛时间依赖于初始条件。为了使收敛时间对初始条件具有鲁棒性,给出了两种不同的固定时间梯度法设计。一种是利用正弦函数的收敛时间与正弦函数的频率有关的性质设计的。另一种是利用Mittag-Leffler函数的性质设计的,其收敛时间由Mittag-Leffler函数的第一个正零点决定。所有的结果被扩展到更一般的情况下,最后证明了一些专门的仿真例子。

英文摘要:

It is known that the gradient method can be viewed as a dynamic system where various iterative schemes can be designed as a part of the closed loop system with desirable properties. In this paper, the finite-time and fixed-time convergence in continuous-time optimization are mainly considered. By the advantage of sliding mode control, a finite-time gradient method is proposed, whose convergence time is dependent on initial conditions. To make the convergence time robust to initial conditions, two different designs of fixed-time gradient methods are then provided. One is designed using the property of sine function, whose convergence time is dependent on the frequency of a sine function. The other one is designed using the property of Mittag-Leffler function, whose convergence time is determined by the first positive zero of a Mittag-Leffler function. All the results are extended to more general cases and finally demonstrated by some dedicated simulation examples.

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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