THE STUDY OF THE GLOBAL STABILITY OF HIGH PERFORMANCE AIRCRAFT AT HIGH ANGLES-OF-ATTACK

In order to study the global stability of the high performance aircraft at highangles-of-attack,this paper describes a new approach based on the qualitativetheory of O.D.E,bifurcation analysis and catastrophe theory.First,a series ofalgorithms is given,by which equilibrium,bifurcation surfaces and periodicattractors are calculated and the global stability of the aircraft is discussed.Secondly,the relations between the stability criteria commonly used in aircraftdesigns and the eigenvalues of linearized matrices at the equilibrium points arestudied.Finally,by means of calculation of a concrete aircraft,some importanthigh angles-of-attack flight phenomena,such as jump,hysteresis,wing rockand spin are analysed by the approach.