Method Research On Trajectory Design And Optimization Of Hypersonic Cruise Missile

Trajectory design should be considered primarily in the integrated design and subsystem design (launch system, guidance system, structural system and etc.). Based on the actual technique and tactics requirements, it takes constraint conditions such as the engine's performance, missile's aerodynamic characteristic, launch/boost mode, overload and angle of attack into consideration and is built on the aerodynamics, flight dynamics theory and interrelated techniques. This thesis designs a hypersonic cruise missile's trajectory and optimizes it. The main research is listed as below:First of all, the characteristics of the hypersonic cruise missile are analyzed. It includes introduction of various styles of scramjet engine, analysis of the primary technical parameter of scramjet engine, the launching and boosting way of hypersonic vehicle and comparisons of pneumatic characteristics between aerodynamic configurations focus on configurative advantage of the wave-rider.Secondly, trajectory optimization theories are introduced. Fundamental issues of trajectory optimization are analyzed, in which includes that the essence of trajectory optimization, establishment of optimization model, iterative solution of optimization model, convergent terminative conditions and etc. As a result, SUMT is applied to constrained optimization solution, and Hooke-Jeeves mode search method is applied to unconstrained optimization solution.Thirdly, longitudinal trajectory of the hypersonic cruise missile is optimized. Considered characteristics of the hypersonic cruise missile, the trajectory prediction model is established. Valued by the range as performance index and four-dimensional variables taken as design variables, this constrained optimization problem is translated into unconstrained optimization problem in SUMT method after specify constraint conditions are defined. Then Hooke-Jeeves pattern search is applied. The optimized parameters are analyzed after steps above, in order to judge the optimality of solution and the sensitivity of performance index to design variables.Finally, eluding trajectory is designed preliminarily. Based on intelligence penetration technology, a design method of intelligence eluding trajectory is showed which aims at the proportional navigation interceptor. There needs to identify the interceptor's sort and estimates its state at the intercept point in this method, so as to compute the sine-wave maneuver amplitude and frequency.