Dynamic Analysis And Optimization Of Tank Firing On The Move

With the rapid development of modern warfare forms,the firing accuracy,muzzle kinetic energy,maneuverability and operating condition of modern tank have changed greatly.With the increase of the armor piercing power,the launching load,muzzle kinetic energy and momentum all increase significantly,and the vibration characteristics of gun become more prominent.In addition,in order to meet the requirement of high maneuverability,reduce the weight of tank and improve the speed of tank,especially when firing on the move,the road excitation to tank increases sharply.As a result,the nonlinear dynamical laws of tank and gun become more and more complex,and the contradiction between maneuverability and firing accuracy is increasingly outstanding.The existing design theories and methods have been difficult to resolve this contradiction.It is urgent to study the nonlinear dynamic response law and general properties optimization of high maneuverability tank.Based on this background,aiming at improving the firing accuracy of tank firing on the move,the modeling method of mechanical-electrical-hydraulic coupling dynamics of tank firing on the move,the influence law of nonlinear factors under high maneuverability conditions and the structure optimization of tank under comprehensive running conditions are systematically and deeply studied in this paper.The topological analysis of the tank multibody system was carried out.Based on the reasonable simplification and hypothesis,the multibody system dynamic model of tank firing on the move was established according to the actual force and motion during firing.Therein,the finite element flexible body technique was used to describe the elastic deformation of the barrel.The nonlinear spring damping model was used to simulate the relationship between barrel and bushing.The clearance rotating hinge model was used to simulate the relationship between trunnion and bearing.Referring to the grading standard of road roughness in China,the three-dimensional road roughness models with different grades considering the coherence of the left and right tracks were reconstructed by using the harmonic superposition method.The launching dynamic law of tank on the move was obtained by numerical calculation,and the preliminarily test was carried out.A coupling dynamic model between the vertical stability control system and the tank mechanical system was established based on the multidisciplinary co-simulation method.Therein,the hydraulic system was modeled in Amesim,the PID control system was modeled in MATLAB/Simulink and the mechanism dynamics was established in Recur Dyn.An adaptive robust controller for tank vertical stabilizer was designed and the superiority was verified by comparing with the traditional PID controller.In addition,it was found that the central angular displacement of the trunnion of tank on the move was not the same as that of the muzzle.Therefore,the muzzle central angular displacement was proposed as the error compensation signal of controller,which greatly improves the comprehensive stabilization effect of the vertical stabilizer,and it was verified by calculation.The force acting on the projectile during the movement in bore was analyzed.A projectile-barrel coupling modeling method based on the gap cylindrical hinge model was proposed.The improved normal contact force model with nonlinear stiffness coefficient based on the L-N model was introduced to describe the nonlinear characteristics of the contact force between projectile and barrel.On this basis,the dynamic bending of barrel and the effect of projectile-barrel coupling on the gun vibration during projectile in bore were analyzed.Furthermore,the hull vibration,dynamic bending of barrel,muzzle vibration and projectile motion under high maneuverability conditions were analyzed.It provides the theoretical support for the overall design of the new generation of high maneuverability and high accuracy tank.Taking the disturbance at the muzzle of the projectile as the optimization target,a high-dimensional multi-objective optimization method for the firing problem of tank on the move under comprehensive running conditions was proposed.The agent model of gun vibration was constructed by combining the projectile-barrel coupling dynamic model of tank firing on the move,the Sliced Latin Hypercube design method and the BP neural network method.By using genetic algorithm and potential optimal infill-point criterion,a desirable optimal solution of tank firing on the move under comprehensive running conditions was carried out.Within the acceptable calculation cost range,the sequence approximate optimization solution satisfies the actual needs and improves the firing accuracy of tank firing on the move under comprehensive running conditions.