Multi-Physical Field Coupled Analysis And Simulation For Four-Rail Round-Bore Electromagnetic Rail Launcher

Electromagnetic railgun is at the leading edge of artillery launching technology.This technology can significantly increase projectile muzzle velocity and kinetic energy,and becomes more and more attractive all over the world.Compared with conventional railguns,the four-rail round bore electromagnetic railgun has advantages of lower repulsive force on the rails and higher launching efficiency.With these advantages,it has distinct value on engineering application and bright development prospect.In this paper,multi-physical field coupled analysis was conducted for the barrel and rails of a four-rail round bore electromagnetic railgun using solid armature.The main contents and results of this paper are listed as following:(1)The theoretical comparation was taken from the view of structure between a four-rail round bore railgun and a two-rail round bore railgun with similar parameters.The relationship between electromagnetic repulsive force and propulsive force of two type of railgun is analyzed and comes to the conclusion that four-rail railgun have 35.36%repulsive force and 1.414 times of launching efficiency compared with the two-rail type.This result shows four-rail railgun has significant advantages.(2)The electromagnetic field characteristics,kinematics characteristics,heat generation as well as their effects on the launching performance were analyzed theoretically.The design parameters such as materials,structure,launching current are determined.The 2D finite element models of cross section area based on four-rail railgun and two-rail railgun with similar parameters were developed.The loads and boundary conditions for the simulation were determined as well.(3)The static analyses of electromagnetic-structural coupling fields and the transient analyses of electromagnetic-structural-temperature coupling fields were conducted for the four-rail railgun and two-rail railgun respectively.The results of rail electromagnetic force,displacement,equivalent stress,temperature,and insulation material radial displacement,radial stress were acquired.Result parameters of four-rail railgun and two-rail railgun were compared between each other and the advantages of four-rail round bore railgun were verified.This study provides theoretically support for the practical design and application of electromagnetic railgun.