In a recent article Pal et al. (2020), an arbitrary time convergence controller design method is proposed for a $n$th order nonlinear system ($n\ge 1$). Although the analysis of the Lyapunov characterization for free-will arbitrary time stable systems (Pal et al. (2020)[Thm. 1]) and the controller design for first order system are correct, the validity of the further extensions to second and higher-order systems is questionable.

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关于“具有任意收敛时间的控制器设计”的评论[Automatica 108710]

在最近的一篇文章中，Pal等人。（2020），提出了一种任意时间收敛控制器设计方法。$ñ$一阶非线性系统$ñ\ge \mathrm{1个}$）。尽管对自由意志任意时间稳定系统的Lyapunov表征分析（Pal等人（2020）[Thm.1]）和一阶系统的控制器设计是正确的，但进一步扩展到二阶及更高阶系统的有效性订单系统值得怀疑。