A Research Method for Shock Loadings on Rotation Isolator used in Course Correcting Fuse

This paper proposes a simulation method in order to analyze the dynamic response of the components in ammunition to the sever shock loadings during the process of launch accurately It is the implicit-explicit sequential finite element dynamic analysis to research the shock loadings on the rotation isolator used in Course Correcting Fuse. The paper builds an integrated model containing isolator, projectile, gun tube and breech. The simulation process is finished by mesh generation, setting the loads boundary conditions, contact definition and output control. At first, gun tube's deformation due to gravity at 52 degrees quadrant elevation was acquired from the implicit analysis. Then the displacement and velocity of projectile are obtained to verify the gun tube's deformation through the explicit analysis. The bearings' axial and transverse acceleration in the isolator are depicted. The results of the research indicate that the gun tube deformation, base pressure and pressure dissipation at the muzzle exit are main factors to influence the shock loadings on the isolator. The projectile's accelerated spin and the collision with the barrel inside wall produce centrifugal inertia force and gyroscopic couple which influence the transverse shock loadings. In addition to this, a calculation method is proposed to work out the maximum contact stress of the bearing's components. The method is combined with the bearings' components maximal contact stress in the process of simulation. The results of the research prove that the calculation method is correct and credible. The research conclusions provide some reference for the structural design of Course Correcting Fuse.