Preliminary Design And Trajectory Optimization For Homing Missile

Homing missile has been a major research in the whole world due to it ’s fire-and-forget characteristic.As a part of the tactical missile,homing missile preliminary design involves many subjects such as aerodynamics,configuration,propulsion,control,trajectory and so on.Based on existing mi ssiles,using multidisciplinary design optimization(MDO)can help designer obtain the optimal design which improves missile ’s performance.Moreover,trajectory is one of the most important disciplines of the homing missile,and directly determines the battling effectiveness.T herefore,it ’s necessary to develop trajectory optimization after the preliminary design of homing missi les.Focusing on homing missile,the missile discipline modeling technique,multi-objective optimization method,preliminary optimization technique and trajectory optimization method are researched.Take PAM as a design basis,the preliminary design and optimization of the homing missile are completed.T hen,considering the imaging and attacking capability,the trajectory optimization in synthetic aperture radar terminal guidance imaging period has been developed.The main contents are summarized as follows.(1)Based on the review of development of homing missile,missile discipline modeling technique,missile preliminary design technique and trajectory optimization method,the state of art and development trend are mastered.(2)In order to support the preliminary design of homing missiles,the usual missile modeling methods of aerodynamics,configuration,propulsion,control and trajectory are discussed and developed.(3)The multi-objective optimization strategy is researched.Three types of strategy are introduced: strategy based on weighed summary method,the strategy based on physical programming,the strategy based on NSGA-II.T he implantation,advantages and disadvantages of each strategy are shown,and the engineering practicability is discussed by standard test example.(4)Based on PAM missile,the preliminary design of homing missiles has been accomplished,and the design is verified by trajectory simulation and monte carlo test.(5)After the preliminary design,the preliminary optimization is completed by the Multi-objective optimization strategy using radial basis function and physical programming.Compared to the initial design,miss distance decreases 28.6%,final velocity increases 3% and attack time decreases 1.7%.So the performance of hit accuracy,damage probability and time-to-hit have been improved.(6)Gauss pseudospectral method is studied.Taking dwell time as optimal objective,the terminal trajectory optimization has been completed by gauss pseudospectral method.As the results shown: in the case of path co nstraint,the dwell time decreases from 5.31 s to 2.02 s,so the imaging capability has been improved.