| The launching process of the gun is a complex process with instantaneous, strong impact and high energy. There is a direct link between studying Launch dynamics and improving the comprehensive properties of the gun. The mortar-howitzer-type light towed gun was studied by the correlational numerical methods, multibody dynamics, finite element analysis and optimization theory, which can provide theoretical foundation and design decision for overall structural design of the howitzer mortar. There are four main parts in the paper:(1) The operational principle of the recoil mechanism was introduced, at the same time the movement and force of the recoil and counter-recoil were analyzed. According to the movement and force characteristics of the recoil system dynamics model, calculation program was established and solved to obtain the data of recoil and counter-recoil movement of the howitzer mortar.(2) The three-dimensional model of the whole howitzer mortar was built by3D modeling software. Based on the multi-rigid-body dynamics, the multi-rigid-body dynamics of the howitzer mortar was established by ADAMS. According to the actual movement and force of the howitzer mortar, the loads and constraints of launch dynamics model were edited in ADAMS, and the simulation was carried out in different working conditions. The results about the different conditions of muzzle disturbance, firing stability and stress response were analyzed and compared.(3) The carriage structure was introduced. Based on the theory of nonlinear dynamic finite element method, nonlinear finite element model of the mortar howitzer about under carriage, cradle and barrel assembly was built by ABAQUS. According to the actual movement and force, the nonlinear finite element model was edited in ABAQUS, and the simulation was carried out in different conditions of high and low fire angle. The results of dynamic stiffness and strength about cradle and under carriage of the howitzer mortar were analyzed and compared.(4) The structure optimization model of recoil mechanism was established by ISIGHT integrating the recoil system simulation. Within a certain range of recoil length, the optimization model choosing resistance peak minimum as the objective function and control rod dimensions as design variables was built up. The recoil resistance peak was reduced and the recoil resistance curve was smooth after optimization. The optimization model can provide reference value to optimize the structure of recoil mechanism. |
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