Morphing Vehicle Conceptual Design And Optimization Trajectory Of Hypersonic Vehicle

To meet the demand of the ever-increasing complexity of battlefield environment for the characteristics of hypersonic vehicle and to extend performance envelop of the existing hypersonic vehicle,two variable-wing mode conceptual design method was designed.Compared with the traditional variable aircraft,hypersonic variable vehicle has the advantages of range,velocity and penetration capability.The difficulty and hot spot of hypersonic variable vehicle research is the complexity of the flight environment and we must research the influence of the characteristics of aerodynamic,the characteristics of aerodynamic heating as well as the overload.This paper mainly do some research on conceptual design method of hypersonic variable vehicle and optimization trajectory,some standpoints and methods are supported and some results are gained.The main work is as follow:Firstly,this thesis combs the domestic and foreign development present situation an d the research level of hypersonic vehicle and morphing aircraft,then the calculation method of aerodynamic and aerodynamic heating of morphing aircraft and the method of optimization trajectory were summarized.Then,designed two conceptual models of a kinds of morphing aircraft.Carried on numerical calculate of the aerodynamic characteristic of this kinds of morphing aircraft by DATCOM software.To verify the accuracy of the DATCOM result,some double calculation were present by the CFD method.We analyzed the lift-to-drag ratio characteristics of this kind of variable shape vehicle,and the impact mechanism of variable wings on aerodynamic characteristics is explained.A general low that change the attack angle and variable angle at the same time is presented to give consideration to the aerodynamic characteristics.At last,to improve the gliding ability of aerial aircraft with morphing swept wings,the optimization of glide trajectory was studied.The control law of attack angle and was optimized,and a design method based on double control variables was proposed.The Radau Pseudospectral Method(RPM)is adopted to achieve the optimization trajectory of two vehicle with variable-sweep wings and fixed wings respectively.The optimization results accord with the distribution rules of aerodynamic characteristics,and the method of optimizing trajectory using the optimal control was feasible.The method of variable-wing modeling and design of trajectory optimizing on this paper provides theoretical of hypersonic morphing vehicle’s design.