Based On The Coupling Of The Artillery Missile Nonlinear Dynamic Characteristics Analysis And Research

By taking large-ealibre ultra weight-light towed howitzer as a researching background, this paper is studing on the nonlinear structual dynamics of launching of gun system based on the projectile-barrel system by FEM, which can offer both theoretical and technical support essentially.This paper made a systematic expositon of FEM modeling strategy and modeling technology of towed howitzer. The features of geometric modeling establishment and process is introduced in virtual enviroment. FEM grid modeling method and its application of the part of towed howitzer using different FEM tools is also concluded.FE modeling technologies of rifled tube is researching and solveing with meshing technologies of single-section mapping hexalledral elements. Considering the plastic deformation of the band, the Projectile-barrel Coupling system is established. The dynamic response of gun firing under the condision of initial deflection due to gravity of tube is simulated and analyzed by data transfering technology.Each part of disproportion factors of the projectile which have fluence on lateral velocity is presented. Dynamic response of muzzle between tube and cradle under different fitting tolerance is simulated and the result concerning about it is obtained. the stiffness of elevating-equilibrium mechanism which have fluence on the dynamic response of muzzle is also discussed.In term of characteristic between standard integral algorithm and explicit integral algorithm of nonlinear FE structual dynamics equation, a hybrid operation technique is put forward and applied in the simulation of Dynamic launching of gun system FEM. Mechanism property of recoil device is imposed by means of constucting Subroutine VUAMP and data transfer between the Subroutines. Considering factors discussed above generally, nonlinear FEM model based on the Projectile-barrel coupling system is established, and hybrid operation technique is applied in calculating this model. The influence of supporting parts of gun system due angular moment to the is also analyzed.The works depict above set a firm foundation for further studing on the mechanism of launching of gun system and structual and physical factor which affect the initial motion state at the time of which projectile flies out of muzzle.