NONLINERA COUPLING ANALYSIS FOR HYPERSONIC FLIGHT VEHICLE

Based on 3D figuration, the nonlinear coupling between the airframe and scramjet for hypersonic vehicle is investigated in this paper. Firstly, a free-free beam structure elastic model is utilized taking into account of varying cross-section moment of inertia and uneven mass, and 3D elastic deformations are introduced. Then, the coupling dynamic equation is established and the coupling characteristics among the 3D aerodynamics, structure elastic deformation and propulsion are analyzed. The solution of the thrust force and its relation with the elastic deformation are presented and analyzed qualitatively and quantitatively. The results show that the elastic deformation of the structure affects the thrust force of scramjet significantly which provide very important information for the operation of scramjet and control of hypersonic vehicle