Research On The Scheme Of The Rear Frame Buffer Device Of A Light Artillery

In the design of ultra-light howitzer,firing stability is a constraint that requires senior priority.When the howitzer fires at a flat or small angle,the amount of runout of the artillery mount relative to the ground must be as small as possible,otherwise,the firing accuracy,structural strength,and firing speed of the howitzer will have adverse effect.The backtrail buffer device on the M777 and AH4 ultra-light howitzer can expand the idea to improve the firing stability of the howitzer.The effects of two backtrail buffer layout schemes on the firing stability of two types of ultra-light howitzer including traditional structures similar to M777 are analyzed by launch dynamics.Application of nonlinear finite element method,numerical calculation,optimization design and other methods to research the buffer arrangement scheme of backtrail,buffer structure design and parameter optimization,dynamic characteristics of the lower frame,the impact of the rear large frame buffer on the initial disturbance of the projectile,etc.(1)Analyzing the impact of backtrail buffer on firing stability and howitzer mount stress.Take the traditional ultra-light howitzer and the ultra-light howitzer with certain firing stability control principle as research objects.The dynamic finite element method was used to research the effects of the backtrail buffer layout scheme and buffer characteristics on the firing stability of two different types of ultra-light howitzer through the virtual simulation of the backtrail buffer.(2)For the design of an ultra-light howitzer buffer with the certain firing stability control principle,the frontal design of two different types of buffer structure parameters is designed.Analyzing the respective structural characteristics and working principles of the two types of buffers.The loading of the cushioning force is performed in the form of subroutine to realize the co-simulation of the buffering characteristics and launch dynamics.(3)Constructing an approximate model for the rigid-flexible coupling finite element model of the howitzer.To improve the firing stability of the howitzer and reduce the peak value of the cushioning force,the non-dominated sorting genetic algorithm(NSGA-II)was used to optimize the size of the control rod buffer parameter;To improve the firing stability of howitzer,multi-island genetic algorithm(MIGA)was used to optimize the structural parameters of the adaptive buffer.(4)Analyzing on the force characteristics of two types of howitzer lower carriage.Investigating the effect of buffer characteristics on the dynamic characteristics of the howitzer carriage under different soil support conditions.From the energy point of view,the influence of buffering characteristics on the energy change of howitzer lower carriage is analyzed.(5)Based on the finite element model of projectile-barrel coupling,researching on the influence of buffering characteristics on the initial disturbance of projectile under different soil support conditions.The research results provide a reference for the layout of buffer and the optimization design of buffer structure parameters.