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本文通过算例,分析讨论弹性飞机与飞行控制系统之间耦合引起的不稳定现象,进而探讨消除这种耦合作用所采取的重要措施——设计合适的结构滤波器。通过对刚、弹性飞机开、闭环动态特性计算结果的比较与分析,以及对不同参数滤波器频率特性的计算与分析,得出了结构滤波器参数选择的一些基本原则。再经过大量选择性计算,最后选定了结构滤波器的形式与参数。引入具有所选参数的结构滤波器后的弹性飞机闭环动态特性计算,结果表明,飞机与系统之间的耦合不稳定现象消失了,幅频特性曲线上的共振尖峰大大削弱了。这说明所选结构滤波器达到了消除飞机与系统耦合的设计要求。
In this paper, an example is given to analyze and discuss the instability caused by the coupling between the flexible aircraft and the flight control system. Then the important measures taken to eliminate this coupling action are discussed - the design of a suitable structural filter. By comparing and analyzing the calculation results of the dynamic characteristics of the open and closed loops of the rigid and elastic aircraft, and calculating and analyzing the frequency characteristics of different parameters of the filter, some basic principles of the structural filter parameters selection are obtained. After a large number of selective calculations, the final form of the structure of the filter and parameters. The closed-loop dynamic characteristics of the elastic aircraft after the structural filter with the selected parameters are introduced. The results show that the coupling instability between the aircraft and the system disappears and the resonance peak on the amplitude-frequency characteristic curve is greatly weakened. This shows that the selected structure of the filter to achieve the elimination of aircraft-to-system coupling design requirements.