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Comments on “A new method of switching surface design formultivariable variable structure system”

机译:关于“多变量可变结构系统切换曲面设计的新方法”的评论

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This note points out some errors in the above paper (Lee and Zu, ibid., vol. 39, no. 2, p. 414-19, 1994). It is argued that the proof in the main theorem is not mathematically rigorous. The control scheme requires the derivative of the sliding variable to be available, which is equivalent to saying that the uncertainties of the system are measurable. This is highly impractical if not impossible to implement. The theorem also says that the proposed new switching surface and control scheme can guarantee robustness of the system from initial time to final time. This is also incorrect because the theorem only shows that the sliding variable tends to zero approximately, i.e., the sliding motion only occurs approximately at t=∞. The paper also contains several misprints
机译:本说明指出了上述论文中的一些错误(Lee和Zu,同上,第39卷,第2期,第414-19页,1994年)。有人认为,主定理中的证明在数学上并不严格。该控制方案要求滑动变量的导数可用,这相当于说系统的不确定性是可测量的。即使不是不可能实现,这也是非常不切实际的。该定理还说,所提出的新开关表面和控制方案可以保证系统从初始时间到最终时间的鲁棒性。这也是不正确的,因为该定理仅表明滑动变量趋向于近似为零,即,滑动运动仅在t =∞时才发生。本文还包含一些误印

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