基于正规形法的结冰飞机着陆阶段非线性稳定域

发布时间：2018-03-29 21:24

本文选题：飞机结冰　切入点：稳定域　出处：《航空学报》2017年02期

【摘要】：结冰导致飞机飞行包线缩小、对飞行安全产生严重威胁,研究结冰后飞机非线性稳定域对边界保护系统的设计和飞行安全的提高极其重要。以某型运输机为研究对象,考虑飞机非线性气动特性建立飞机纵向非线性模型并进行增稳控制补偿设计;然后通过流形和正规形理论刻画结冰飞机纵向非线性稳定边界并得到稳定边界的解析表达式,通过仿真的手段验证了正规形理论确定的稳定边界和解析表达式的有效性和准确性。最后,分析了飞机着陆过程中,结冰因子对结冰飞机稳定域的影响以及结冰飞机发生事故的机理。研究结果表明,轻度结冰使飞机非线性稳定域缩小;重度结冰导致飞机稳定性发生改变;在未察觉飞机结冰的情况下,飞行员的常规操纵会使飞行状态超出结冰飞机的非线性稳定域、导致飞行事故。研究结果可为飞机结冰后的边界保护提供一定的参考。
[Abstract]:Icing results in the reduction of aircraft flight envelope, which poses a serious threat to flight safety. It is extremely important to study the nonlinear stability region of aircraft after icing for the design of boundary protection system and the improvement of flight safety. A certain type of transport aircraft is taken as the object of study. Considering the nonlinear aerodynamic characteristics of aircraft, the longitudinal nonlinear model of aircraft is established and the compensation for increasing stability is designed, then the longitudinal nonlinear stable boundary of frozen aircraft is described by manifold and normal form theory and the analytical expression of stability boundary is obtained. The validity and accuracy of the stable boundary determined by the normal form theory and the analytical expressions are verified by simulation. Finally, the landing process of the aircraft is analyzed. The influence of icing factors on the stability region of frozen aircraft and the mechanism of accidents in frozen aircraft. The results show that the nonlinear stability region of aircraft is reduced by mild icing, and the stability of aircraft is changed by severe icing. When the aircraft is frozen, the pilot's routine control will make the flight state exceed the nonlinear stability region of the frozen aircraft and lead to the flight accident. The research results can provide a certain reference for the boundary protection after the aircraft is frozen.
【作者单位】：空军工程大学航空航天工程学院;
【基金】：国家自然科学基金(61374145) 国家“973”计划(2015CB755805)~~
【分类号】：V328;V321.229

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