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用非线性动态逆方法设计超机动飞机的控制律是一种简便可行的方法,但实际使用时需要解决控制律的离散化问题。多变量非线性系统的离散化是一个复杂的问题。本文根据逆方法和歼击机运动的特点,提出了一种简单直接的实现方法,该方法基本保留了连续域系统控制律的形式。用通常歼击机的最高采样频率来实现该方法,可以得到与连续域非常接近的控制结果。本文还提出了该形式的多速率实现方式,可以降低对机载计算机吞吐力的要求,其控制结果与连续域的差别仍很小。最后讨论了如计算时延等实际问题
It is a simple and feasible method to design the control law of an ultra-mobile aircraft using a nonlinear dynamic inverse method. However, the discretization of the control law needs to be solved in actual use. Discretization of multivariable nonlinear systems is a complex problem. Based on the characteristics of inverse method and fighter motions, a simple and direct method is proposed in this paper. This method basically retains the form of the control law of continuous domain system. Realizing this method with the highest sampling frequency of a normal fighter plane results in very close control of the continuum. This paper also proposes the multi-rate implementation of this form, which can reduce the requirement of on-board computer throughput, and the difference between the control result and continuous domain is still small. Finally, the actual problems such as calculating delay are discussed