| With the research background of a launching device,the dynamical finite element model of launching device is established.The simulation is carried on based on the finite element method and secondary development subroutine.The influence on the dynamical characteristic of a buffer for the launching device and muzzle disturbance by different structural parameters in the recoil process is studied.The structural parameters of the buffer are optimized through theory of structural optimization and genetic algorithm.The key technology of MRF and the recoil principle of MR damper is researched.The mechanical model of MR damper based on Bingham constitutive model is constructed.The influence on the output resistance and dynamical adjustable coefficient of the buffer by structural parameters is analyzed.The dynamical nonlinear finite element model of the launching device is constructed.The Fortran program with the pot of user subroutine is developed in ABAQUS software,based on which,the load model of buffer is established.Based on,implicit dynamic method and numerical calculus,the output resistance of the buffer of launching device and the law of recoil movement and muzzle disturbance in recoil process is obtained.Based on the finite element model of the launching device,taking the horizontal and vertical displacement,velocity,angular displacement and angular velocity of muzzle center when the projectile get out of muzzle as optimization goal,the influence on output resistance of buffer,recoil movement and muzzle disturbance by the parameters of input current,damping channel gap,piston diameter,piston rod diameter and piston effective activated length is studied.As well,the impact on muzzle disturbance by the Installation location of buffer and slide is researched.With the Optimal Latin Hypercube Design method,the experiment samples are extracted,based on which,the approximate model of launching device is established.Taking muzzle disturbance as optimization goal,the structural parameters of the buffer are optimized with Multi-island Genetic Algorithm.The result shows that the muzzle disturbance significantly decreases.The dynamical nonlinear finite element model of the launching device and the optimization design of the key structural parameters of the buffer have reference value for the performance improvement of recoil device of a launcher under impact load and the reducing of muzzle disturbance. |
