Aircraft nonlinear stability analysis and multidimensional stability region estimation under icing conditions  

作　　者：Liang QU Yinghui LI Haojun XU Dengcheng ZHANG Guoqiang YUAN 

机构地区：[1]School of Aeronautics and Astronautics Engineering, Air Force Engineering University, Xi'an 710038, China

出　　处：《Chinese Journal of Aeronautics》2017年第3期976-982,共7页中国航空学报（英文版）

基　　金：co-supported by the National Key Basic Research Program of China(No.2015CB755805);the National Natural Science Foundation of China(No.61374145)

摘　　要：Icing is one of the crucial factors that could pose great threat to flight safety,and thus research on stability and stability region of aircraft safety under icing conditions is significant for control and flight.Nonlinear dynamical equations and models of aerodynamic coefficients of an aircraft are set up in this paper to study the stability and stability region of the aircraft under an icing condition.Firstly,the equilibrium points of the iced aircraft system are calculated and analyzed based on the theory of differential equation stability.Secondly,according to the correlation theory about equilibrium points and the stability region,this paper estimates the multidimensional stability region of the aircraft,based on which the stability regions before and after icing are compared.Finally,the results are confirmed by the time history analysis.The results can give a reference for stability analysis and envelope protection of the nonlinear system of an iced aircraft.Icing is one of the crucial factors that could pose great threat to flight safety,and thus research on stability and stability region of aircraft safety under icing conditions is significant for control and flight.Nonlinear dynamical equations and models of aerodynamic coefficients of an aircraft are set up in this paper to study the stability and stability region of the aircraft under an icing condition.Firstly,the equilibrium points of the iced aircraft system are calculated and analyzed based on the theory of differential equation stability.Secondly,according to the correlation theory about equilibrium points and the stability region,this paper estimates the multidimensional stability region of the aircraft,based on which the stability regions before and after icing are compared.Finally,the results are confirmed by the time history analysis.The results can give a reference for stability analysis and envelope protection of the nonlinear system of an iced aircraft.

关 键 词：Dynamic system Equilibrium points Icing aircraft Nonlinear stability Stability region 

分 类 号：V321.229[航空宇航科学与技术—人机与环境工程]