But whether classical control theory or modern control theory need to know the mathematical model of the controlled plant.

但无论是经典控制理论还是现代控制理论，都需要事先知道被控对象的数学模型。

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When a high order controlled plant contains several small time constant inertia units, it can be simplified to low order time-delay system.

一个高阶被控对象含有几个小时间常数惯性环节时，可简化成低阶时滞系统。

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The controller formed by this control logic consists of both the feed-forward of the reference model system states and the feedback of the controlled plant states.

该控制方案所形成的控制器由参考模型系统状态的前馈和被控系统的状态反馈两部分组成。

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