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现代飞机的自动控制系统都具有控制与增稳两种功能,它通过伺服系统与控制面相连。这种系统与控制对象——飞机之间形成一个闭合回路,如图1所示。考虑到控制系统与飞机两者间动力学特性的相互作用,构成一系列性质各异的回路问题。根据他们不同的外部条件和涉及面的特性差异,形成了多种现象,其中一个引人注目的问题就是闭合回路的稳定性问题。通常在把控制系统或结构作为单独分支而设计时是稳定的,而把它们串联起来成为一个整体时,系统的稳定性就发生了变化。
Modern aircraft automatic control system has both control and stabilization of the two functions, it is connected to the control plane through the servo system. This system forms a closed loop with the control object, the airplane, as shown in Figure 1. Taking into account the interaction between the control system and the dynamics of the aircraft, a series of loops of different nature are formed. According to their different external conditions and the characteristics of the involved surfaces, many phenomena have been formed. One of the most conspicuous problems is the stability of the closed circuit. The stability of the system is usually changed when the control system or structure is designed as a separate branch, and when they are connected in series, the stability of the system changes.