ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Longitudinal nonlinear stabilizing region for icing aircraft based on phase-plane method
Received date: 2015-05-08
Revised date: 2015-07-07
Online published: 2015-07-14
Supported by
National Basic Pesearch Program of China(2015CB755805);National Natural Science Foundation of China(61374145)
Icing is one of the factors that could pose great threat to flight safety; therefore it is significant to conduct a research on stability and stabilizing region of aircraft for control and flight safety under icing conditions. Due to the early arrival of stalling angle of attack of icing large airplane, it is obvious that the research on the flight stability of a small angle of attack in the linear phase cannot meet the requirement. Firstly, the aircraft longitudinal nonlinear model for large angle of attack is proposed under icing conditions based on the nonlinear relation between the angle of attack and the lift. Then, the longitudinal stabilizing region of angle of attack and pitch angular velocity is depicted based on phase-plane method. At the same time, the influences of angle of attack and pitch angular velocity on longitudinal stability are analyzed. Finally, the stabilizing region based on phase-plane method is verified through the time domain simulation with zero input according to different initial conditions inside and outside of the stabilizing region. The results can provide a reference for stability envelope determination and envelope protection of icing aircraft.
QU Liang , LI Yinghui , YUAN Guoqiang , XU Haojun . Longitudinal nonlinear stabilizing region for icing aircraft based on phase-plane method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(3) : 865 -872 . DOI: 10.7527/S1000-6893.2015.0197
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