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arXiv 1906.10091math.OCcs.SYeess.SY
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时空和输入约束下的定时控制:基于二次规划的方法

Fixed-time Control under Spatiotemporal and Input Constraints: A Quadratic Program Based Approach

Kunal Garg, Ehsan Arabi, Dimitra Panagou

摘要:

在本文中,我们提出了一个控制综合框架的一般类的非线性,控制仿射系统的时空和输入约束。首先,我们研究了在输入约束下的固定时间收敛问题。建立了固定时间稳定的输入约束的吸引区域与收敛所需时间之间的关系。结果表明,增加控制权或所需的收敛时间可以扩大固定时间稳定的吸引区域。然后,我们考虑的问题,找到一个控制输入,限制闭环系统的轨迹在一个安全的设置,并引导他们在一个固定的时间内设定的目标。为此,我们提出了一个二次规划(QP)制定计算相应的控制输入。我们使用松弛变量,以保证可行的建议QP输入约束下。此外,当严格互补松弛持有,我们证明了解决方案的QP是一个连续函数的系统状态,并建立唯一的闭环解决方案,以保证前向不变性使用南云定理。我们提出了两个案例研究,自适应巡航控制问题的一个例子和两个机器人运动规划问题的一个例子,以证实我们提出的方法。

英文摘要:

In this paper, we present a control synthesis framework for a general class of nonlinear, control-affine systems under spatiotemporal and input constraints. First, we study the problem of fixed-time convergence in the presence of input constraints. The relation between the domain of attraction for fixed-time stability with respect to input constraints and the required time of convergence is established. It is shown that increasing the control authority or the required time of convergence can expand the domain of attraction for fixed-time stability. Then, we consider the problem of finding a control input that confines the closed-loop system trajectories in a safe set and steers them to a goal set within a fixed time. To this end, we present a Quadratic Program (QP) formulation to compute the corresponding control input. We use slack variables to guarantee feasibility of the proposed QP under input constraints. Furthermore, when strict complementary slackness holds, we show that the solution of the QP is a continuous function of the system states, and establish uniqueness of closed-loop solutions to guarantee forward invariance using Nagumo's theorem. We present two case studies, an example of adaptive cruise control problem and an instance of a two-robot motion planning problem, to corroborate our proposed methods.

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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