Hydrodynamic Parameter Identification And Trajectory Simulation Study Of Submarine-launched Missile

Submarine has the characteristics of high maneuverability and good concealment,which make it widely equipped in the navy.Submarine-launched missile is a missile launched on the platform of submarine.Because it perfectly combines the advantages of submarine and missile,it is more and more popular.However,in modern warfare,it is required to strike the target accurately and continuously,so the tactical requirements and research direction of submarine-launched missiles have changed from single launch to continuous launch.Based on this,this paper simulates the underwater motion process of the underwater continuous launching missile,so as to guide the design of the missile.Firstly,on the basis of conventional torpedo mathematical modeling,the submarinelaunched missile underwater trajectory mathematical model is established and simplified.The identification model of hydrodynamic coefficients of longitudinal motion is established.Five hydrodynamic parameters are identified by using particle swarm optimization(PSO)and its improved hybrid algorithm with least squares as identification criterion.The identification results show that the improved hybrid algorithm has better accuracy and global convergence speed,and the accuracy of the identification results is verified by verification.Secondly,the identified hydrodynamic parameters are substituted into the hydroballistic mathematical model to improve the model.The hydro-ballistic model is programmed by using MATLAB software.The water trajectory of a single submarinelaunched missile is simulated by the self-compiled trajectory program under the conditions of the change of exit velocity,ship speed and launching depth.The influence of different launching environments on the movement attitude and position of the submarine-launched missile is analyzed.Finally,through the force analysis of the secondary submarine-launched missile,the mathematical model of the secondary submarine-launched missile's water trajectory is established.The water trajectory of double-launched missile is simulated by selfcompiled trajectory program under the conditions of different launching speed,different boat speed and different launching time interval.The influence of the first-launched missile on the motion state of the second-launched missile under different conditions is analyzed.