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现代飞行控制系统设计中,如果同时考虑三轴模型,要实现实时最优控制是非常困难的,因为飞机短周期运动三轴模型阶数通常是七、八阶,要实现最优控制,就得实时求解相应维数的Riccati方程,这对于阶数较高的系统是非常困难的,甚至根本无法实现。但是,如果系统维数很低,实时求解相应维数的Riccati方程则可望实现。因此,将原高阶系统分解成若干相互关联的子系统,进行递阶分级控制,这样子系统的维数将大大低于原系统维数,并且各子系统的最优控制计算可分别由各子系统的计算机完成。由此,飞行控制系统的最优设计实现将成为可能。
In the design of modern flight control system, it is very difficult to realize the real-time optimal control if the three-axis model is considered at the same time. Because the order of three-axis model of aircraft short-period movement is usually seven or eight, in order to achieve the optimal control, Solving the Riccati equation of the corresponding dimension in real time is very difficult or even impossible at higher order systems. However, if the system dimension is low, the Riccati equation for solving the corresponding dimension in real time is expected to be realized. Therefore, the original high-level system is decomposed into a number of inter-related subsystems, hierarchical control, so that subsystems will be significantly lower than the original dimension of the system dimension, and the optimal control of each subsystem can be calculated by Subsystem computer is done. As a result, the optimal design of flight control system will be possible.