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Zeros of discretized continuous systems expressed in the Euler operator-an asymptotic analysis

机译:用欧拉算子表示的离散连续系统的零点-渐近分析

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摘要

The structure of the zeros of SISO continuous-time systems, which are discretized via a zero-order hold and expressed in the Euler operator, is studied. In particular, it is shown that when state-space descriptions of linear SISO continuous-time systems with relative degree /spl ges/2 are discretized, then the zero dynamics of the resulting discrete system is singularly perturbed and shows a separation of time scale. The part of the zero dynamics associated with the fast time scale is shown to correspond to the zeros introduced by the sampling process (sampling zeros). An asymptotic formula for this part of the zero dynamics is given, and implications of the result to control design based on pole zero cancellation is discussed.
机译:研究了SISO连续时间系统零点的结构,该零点系统通过零阶保持离散化并用Euler算子表示。特别地,显示出,当离散相对度为/ spl ges / 2的线性SISO连续时间系统的状态空间描述时,所得离散系统的零动力学将被奇异地扰动并显示出时间尺度的分离。与快速时间标度相关的零动态部分显示为对应于采样过程引入的零(采样零)。给出了零动力学这一部分的渐近公式,并讨论了结果对基于零极点抵消的控制设计的含义。

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