什么是现代控制理论?它研究些什么?本文想作一些简单的介绍。让我们先从一个常识性的问题谈起。当我们在银锄湖上划船的时候,船从码头出发,向目的地铁臂山航行(图1)。由于船受风力的影响,如果放好舵一直不变,那末船没有到达铁臂山,很可能行驶到旁边的黑松林去了.为着能保证到达铁臂山,就得每行驶一段距离,改变一下航向.这样航道就将曲曲折图2).那么,在时刻去 What is modern control theory? What does it research? This article would like to make some brief introductions. Let us start with a common-sense question. When we were paddling on Lake Jubilee, the boat departed from the dock and sailed towards the destination Mt. Arm Hill (Fig. 1). As the ship is affected by the wind, if the rudder is kept constant, then the ship does not reach Tiejiashan, and it is very likely that it will drive to the next black pine forest. In order to guarantee the arrival of Tiejishan, we have to travel every distance. Change the heading. This way the waterway will be twisted. 2) Then, at the moment