Low Detectable Shape And Trajectory Design Of Hypersonic Glide Vehicle

Low detectability is the development trend of future military vehicle.This paper focuses on the low detectability technology of hypersonic glide vehicle,and mainly studys the stealth shape design philosophy and the low detectable trajectory optimization method,to provide technical support of the overall design of the stealth hypersonic glider.The contents of the paper are as follows:First,the rapid calculation method of RCS is studied and programmed.Based on the physical optics method,the numerical integral of the surface induced currents is given,and the framework is established to solve the omnidirectional RCS of vehicle model with triangular surface elements.Through contrastive analysis,the algorithm is validated accuracy and rapidity to get high-precision RCS distribution,and is apt at predicting the decrease trend of RCS with the increase of frequency.Secondly,an edge-sharping scheme of HTV-2 is designed,and sharp-edge vehicle is proved to be good at low detectability.Based on the mesh of parameterized HTV-2,the sharp-edge vehicle is constructed by three step: the cross section extraction of space grids,the evenly points extraction of cross section contour points and the reconstruction of geometric model with all the evenly points.By controlling the number of the cross section and the number of nodes,it's found that the higher the degree of the sharpness and the better low-detectability.Third,the strategy of low detectable trajectory using virtual control variables and constraint successive retrenchment is proposed.It's believed that the aerodynamic property is only related to the angle of attack under hypersonic condition,and the RCS surface is fitted with high-order polynomial.Then the low detectability probability model influenced by RCS and distance is established and analyzed.Finally,an example based on the strategy is introduced to prove that it's efficient at solve the problem of initial value determination of multi-constraint nonlinear programming and convergence with strict constraint,meanwhile the continuity of control variables is guaranteed.Finally,the factors that affect the low detectable trajectory are analyzed.The maximum coverage and lateral maneuver capability of hypersonic glider are acquired.By the trajectory comparison between the original shape and the sharp-edge shape,the sharp-edge vehicle is proved to be better at stealth.The influence of the edge-sharping scheme and radar parameters on the low detectable trajectory is studied,to provide design criteria and user manual of sharp-edge vehicle.The achievements of the thesis can be used to guide the shape design and operational use of hypersonic vehicle in the future,which offers new theoretical and technical support of the development of hypersonic glide stealth vehicle.