Abstract: Traditional projectiles is difficult to realize the quick, small radius and large angle agile turn due to the limitation of maneu-verability. In this paper, a parafoil-missile system, missile with a suspending parafoil as the control surface, is proposed. Firstly, the dynamic model of the parafoil-missile system composed of missile, parafoil, ropes and connection point is proposed, and the dynamic model of the 9-DOF parafoil-missile system is presented. The motion of the parafoil-missile system is compared and analyzed when the flaps deflection is 0°, 25° and 50° through trajectory simulation in the longitu-dinal plane. The analysis results show that the parafoil-missile system can realize agile turn. By means of bifurcation analysis of the dynamic model of the parafoil-missile system, the bifurcation diagram of the system is studied under dif-ferent flap deflections and the rigging angle is taken as the continuous variable parameter. The target stable equilibrium corresponding to the minimum turn radius and the maximum turn final speed of the missile to realize agile turn is obtained. The variation of the attractive region near the target stable equilibrium is analyzed. The trajectory simulation shows that the missile with a mass of 73 kg can achieve the minimum turn radius of 14.50 m and the minimum velocity loss of 20.4 m/s, by selecting the flap deflection and rigging angle reasonably. The parafoil-missile system has important reference significance for improving the performance of agile turn of traditional tactical missiles.

Key words: tactical missiles, ram parafoil, multi-body dynamics, agile turn, bifurcation analysis