一种模型自由飞自主拉杆失速试飞方法设计

Design of a Model Free-flight Test Method Based on Autonomous Tie Rod

大气环境投放模型自由飞试验,是进行飞机失速试飞研究的一种重要手段。在失速试飞中,要求飞机进入失速的过程尽量缓慢,根据模型与飞机之间的相似准则,自由飞试验的减速率要求与真实飞机一致,而模型的响应速率却成比例增加。传统的模型自由飞试验中,依靠操纵手的目视判断和操控很难实现失速进入和改出的精确控制。为改善模型自由飞试验失速过程,降低失速过程减速率,文中提出了一种基于飞行控制系统自主拉杆的失速试飞方法,分析了该方法的关键因素,设计了自主进入失速和自主改出的控制策略,并通过飞行试验验证了该方法的可行性。

Model free flight test in atmospheric environment is an important means to conduct stall test flight research.In the stall test flight,the process of requiring the aircraft to enter the stall is as slow as possible.According to the similarity criterion between the model and the aircraft,the speed reduction rate requirement of the free flight test is consistent with the real aircraft,and the response rate of the model is proportionally increased.The traditional test method which relies on the visual judgment and control of the manipulator is difficult to realize.In order to improve the free flight stall process and reduce the deceleration rate of the stall process,this paper proposes a stall test method based on autonomous rod control,analyzes the key factors of the method,and designs the control strategy of autonomous stall entry and self-recovery.The feasibility of the method is verified by flight test.