The Optimization Of Mortar Gun Hoop Position And The Influencing Factors Of Shooting Intensity

With a scientific research project taken as the background and aiming at the problem of improving the firing stability and the firing dispersion of 120mm mortar,the dynamical nonlinear finite element method and the structural optimization method under multiple load cases are used to optimize the position of the gun hoop,and the influence of the structural parameters of the mortar and projectile on the firing dispersion is studied.First,a contact impact finite element model of a 120mm mortar-projectile-soil coupling system is established.Then the dynamical response of the whole gun is obtained through the explicit nonlinear dynamical simulation.The muzzle disturbance during the firing process and the movement law of the projectile in bore are analyzed as well.Based on the finite element method,Analytic Hierarchy Process(AHP),Kriging model and genetic algorithm,the optimization design of gun hoop position under multiple load cases is carried out.Based on the experimental data,a nonlinear mapping relationship between the gun hoop position and muzzle disturbance is established.By constructing the optimization objective function and solving it through genetic algorithm,the optimal location of the gun hoop is obtained,and the disturbance of the muzzle can be reduced effectively,which is helpful to improve the firing stability of the mortar.On the basis of the optimization model,the influence of the structure parameters on the firing dispersion of the mortar is further studied.Three factors including the location of the gun hoop,the clearance between the barrel and projectile and the mass eccentricity of the projectile are selected.The projectile initial disturbance under different conditions is obtained by dynamical simulation,and the influence law of the structural parameters of the mortar and projectile on firing dispersion is obtained by further calculation.The research methods and results have theoretical and engineering value to the research of the structural optimization design under multiple load cases and the improvement of firing stability and firing dispersion of the mortar.