Washout-filter based bifurcation control of longitudinal flight dynamics

This paper presents the bifurcation control of longitudinal flight dynamic, via washout filter based design. Based on the mathematical model proposed by Garrard and Jordial (1977). a rich variety of bifurcation phenomena, such as saddle-node bifurcation, Hopf bifurcation, and cycle fold bifurcations are observed in the numerical simulations of longitudinal flight dynamics of F-8 aircraft. The occurrence of saddle-node bifurcation and Hopf bifurcation might result in jump behavior and pitch oscillations of flight dynamics. Bifurcation control laws are proposed to change the property of bifurcation phenomena and hence improve system stability.