基于正规形法的结冰飞机着陆阶段非线性稳定域

doi:10.7527/S1000-6893.2016.0279

飞机结冰致灾与防护专栏

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基于正规形法的结冰飞机着陆阶段非线性稳定域

郑无计, 李颖晖, 屈亮, 徐浩军, 袁国强

空军工程大学航空航天工程学院, 西安 710038

收稿日期:2016-08-25 修回日期:2016-10-25 出版日期:2017-02-15 发布日期:2016-11-03
通讯作者: 李颖晖,E-mail:liyinghui66@163.com E-mail:liyinghui66@163.com
基金资助:
国家自然科学基金（61374145）；国家“973”计划（2015CB755805）

Nonlinear stability region of icing aircraft during landing phase based on normal form method

ZHENG Wuji, LI Yinghui, QU Liang, XU Haojun, YUAN Guoqiang

Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi'an 710038, China

Received:2016-08-25 Revised:2016-10-25 Online:2017-02-15 Published:2016-11-03
Supported by:
National Natural Science Foundation of China (61374145); National Basic Research Program of China (2015CB755805)

摘要/Abstract

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。

关键词: 飞机结冰, 稳定域, 非线性, 正规形理论, 运输机

Abstract:

Icing can cause flight envelope shrink and thus poses a great threat to flight safety; therefore, research on nonlinear stability region of an aircraft after icing is significantly important for the design of flight envelope protection system and the improvement flight safety. A transport is taken as an object of this study. Taking the nonlinear aerodynamic characteristics into account, the longitudinal nonlinear dynamic model with stability augmentation control is obtained. Based on the theory of manifold and normal form, the longitudinal nonlinear stability boundary and its analytic expression are obtained. Via dynamic simulation, the stability boundary based on normal form is justified to be feasible and accurate. Finally, icing factor impacting on aircraft stability region and the mechanism for accidents of an icing aircraft is studied at the landing phase. Results show that mild icing condition can cause the shrink of nonlinear stability region, while severe icing condition can change the aircraft stability. When icing of an aircraft is not detected, regular manipulation can result in flight accident as the aircraft state can be out of the icing nonlinear stability region. The results can provide some reference for flight envelope protection under icing condition.

Key words: aircraft icing, stability region, nonlinear, normal form theory, transport aircraft

中图分类号:

V328

郑无计, 李颖晖, 屈亮, 徐浩军, 袁国强. 基于正规形法的结冰飞机着陆阶段非线性稳定域[J]. 航空学报, 2017, 38(2): 520714-520724.

ZHENG Wuji, LI Yinghui, QU Liang, XU Haojun, YUAN Guoqiang. Nonlinear stability region of icing aircraft during landing phase based on normal form method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(2): 520714-520724.

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E-mail：hkxb@buaa.edu.cn

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基于正规形法的结冰飞机着陆阶段非线性稳定域

Nonlinear stability region of icing aircraft during landing phase based on normal form method

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