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CLC number: V328

On-line Access: 2019-03-11

Received: 2017-07-01

Revision Accepted: 2017-09-13

Crosschecked: 2019-01-22

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Citations:  Bibtex RefMan EndNote GB/T7714


Chi Zhou


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Frontiers of Information Technology & Electronic Engineering  2019 Vol.20 No.2 P.292-299


Aircraft safety analysis based on differential manifold theory and bifurcation method

Author(s):  Chi Zhou, Ying-hui Li, Wu-ji Zheng, Peng-wei Wu

Affiliation(s):  School of Aeronautics and Astronautics Engineering, Air Force Engineering University, Xian 710038, China

Corresponding email(s):   15279122641@163.com

Key Words:  Loss of control, Safety envelope, Aircraft dynamic, Bifurcation analysis, Differential manifold theory

Chi Zhou, Ying-hui Li, Wu-ji Zheng, Peng-wei Wu. Aircraft safety analysis based on differential manifold theory and bifurcation method[J]. Frontiers of Information Technology & Electronic Engineering, 2019, 20(2): 292-299.

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A1 - Chi Zhou
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loss of control (LOC) is considered one of the leading causes of fatal aircraft accidents worldwide. Reducing LOC is critical to improve flight safety. Although it is still vaguely defined, LOC is generally associated with a flight state that is outside the safety envelope, with nonlinear influences of aircraft dynamics and incorrect handling by the flight crew. We have studied how nonlinear factors and pilot operations contribute to LOC. In this study, the stall point and bifurcation point are confirmed using the bifurcation analysis, and the results show that the aircraft will stall when excessive elevator movement is commanded. Moreover, even though there may be an equilibrium state in one of the elevator deflections, the flight state may still be outside the flight safety envelope. When the flight state is near the edge of the flight safety envelope, the strategy to regulate the elevator deflection is super-sensitive, and a slight change in the elevator deflection may contribute to a flight state outside the safety envelope. To solve this issue, the differential manifold theory is introduced to determine the safety envelope. Examples are provided using NASA’s generic transport model.




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