Research On Trajectory Optimization For Boost-glide Vehicle

The boost-glide vehicle has the advantages of long range and excellent mobility,so it becomes an important development trend of modern warfare weapons.This dissertation takes boost-glide vehicle as the research object,and researches on boost-glide vehicle's trajectory optimization technique,trajectory characteristic and the whole course trajectory simulation.The main research results are summarized as follows:A method for analyzing the characteristics of hypersonic gliding trajectory is proposed.Based on the hypothesis which trajectory inclination angle and its rate of change is small,formulas of the gliding trajectory and gliding trajectory characteristics are derived.Characteristic parameters of the gliding trajectory are analyzed and simulated.In view of a leap glide cycle,optimal control project is calculated and analyzed with simulation method.According to the results of hypersonic glide trajectory analysis,three feature points for analyzing the gliding trajectory characteristic parameters are given.A method for analyzing the condition of optimal hand-over point is proposed.Based on the characteristic points obtained from the analysis of trajectory characteristics,using unifactor rotational expriment method and orthogonal expriment method,with different hand-over point status,the effect on trajectory characteristics is analyzed.As a summary,initial conditions of optimal trajectory are givend.Whole course trajectory of the boost-glide vehicle is simulated based on hp-Radau pseudospectral method.Model of AHW,which is a hypersonic vehicle of the USA,is analyzed and established.The engineering experience design method of boost phase trajectory and the energy management method based on one-way attitude adjustment are expounded.Based on hp-Radau pseudospectral method and the condition of optimal hand-over point,which is presented in this thesis,flight test assignment and the optimal trajectory of AHW is simulated.Based on hp-Radau pseudospectral method,gliding trajectory characteristics are analyzed and the optimal trajectory of AHW is simulated in this dissertation.This dissertation can provide reference for researchers of trajectory optimization,trajectory prediction and hypersonic vehicle.