The Research On Dynamic Modeling Of The Plane-symmetric Spacecraft Considering Elastic Vibration

The research on hypersonic spacecraft has become the focus and hotspot of major aerospace power in the world recently for its high flight speed and high maneuverability. Due to its high flight speed, its external environment changes more severely, it can cause elastic vibration that has great impact in controlling it. In this paper, with its elastic vibration,propellant liquid sloshing and engine swinging considered, the dynamic modeling of hypersonic plane-symmetric spacecraft has been researched. The main contents of this paper are as follows:Based on the basic assumption of the modeling of the spacecraft, the coordinate system related to the dynamics modeling of the aircraft is established, and the transformation relations between these coordinate systems are presented. According to the basic hypothesis of the model, considering the gravity of the spacecraft, the engine thrust and aerodynamic force, the rigid body dynamics model of the vehicle is established. Considering the influence of the elastic vibration, liquid sloshing and the swinging of the engine on the spacecraft, the elastic vibration equation of the spacecraft is written, the rigid-elastic-sloshing coupling dynamics model of the spacecraft is established.The elastic vibration of plane-symmetric spacecraft is very complicated, however, the elastic vibration of the each component is much simpler. Based on the principle of strain energy invariant, the stiffness of the wings is added to the fuselage. After equivalent, the equivalent model of the whole spacecraft can be analyzed by using the elastic data of the fuselage, so that the problem can be greatly simplified. In this paper, the original model and equivalent model are both simulated, and the equivalent rationality is analyzed according to the simulation results.At last,the research contents are summarized,and the future research work is prospected.