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本文介绍当代飞机装上各类飞行控制系统之后出现的新课题——控制系统与飞机本身动力学之间的耦合不稳定问题。提出了分析耦合不稳定问题可用“闭环颤振”这一概念。并给出了用特征图技术求解“闭环颤振”动力学方程的一般方法。最后,介绍了地面预测耦合不稳定的试验方法以及抑制耦合不稳定的设计措施。
This article introduces the new issue that emerges after the modern aircraft are equipped with various types of flight control systems - the instability of the coupling between the control system and the dynamics of the aircraft itself. The concept of “closed-loop flutter” available for the analysis of coupling instability is proposed. A general method for solving the closed-loop flutter kinetic equation by using the feature graph technique is given. Finally, the test methods for predicting the coupled ground instability and the design measures for suppressing the coupled instability are introduced.