Electromagnetic Rail Gun Modeling And Performance Analysis

Currently, electromagnetic rail gun is one of the endless varieties of new-concept weapons. The electromagnetic rail gun that is applied to actual production is more possible along with technology. In the future, electromagnetic rail gun will be applied to Military, Aerospace, Shipping and so on.Through researching we can find that the inductance gradient, speed of armature, current distribution and magnetic field distribution in the rail gun system is connected with the size of rails and armature. So we need analyze these parameters in the rail gun system. In this paper, we start from the model of electromagnetic rail gun’s rail and armature, track and analyze the dimensions of the inductance gradient and armature whose affection to the velocity of armature in the electromagnetic rail gun system.This paper starts from the theory of classical Maxwell equations, using thinking of line current and solid current, building the simple electromagnetic rail gun’s rail and armature physics model and armature motion model of armature with neglecting velocity skin effect. According to motion model, we use rectangle rails and armature. In the aspire of force added to armature, because of solid armature, using resistance coefficient replaces the solid armature’s resistant. Furthermore, we simulate the motion characteristic with different mass and current amplitude but make the other parameters remain the same.This paper uses the Ansoft electromagnetic finite element simulation software in static solution module of different size, different materials, and different configurations of the rail and armature magnetic field distribution, current distribution. In order to clear out the rail and armature size on the magnetic field and the influence of current distribution in the number of simulation can be limited, in the current pulse is determined, using orthogonal test method, through the establishment of orthogonal table, obtains the reasonable rail and armature size combination. Orthogonal experiments were carried out by the experimental data obtained, and analysis of rail size on the current distribution, the distribution of magnetic field influence.This paper established a railgun rail inductance gradient model, and in the current pulse is determined by the condition, study the relationship between the rail and armature size and inductance gradient. Using the orthogonal experiment method, according to the size of tracks, is significant to analyze the electromagnetic rail gun inductance gradient; the use of simulated annealing method is used to optimize the inductance gradient model, determine the maximum inductance gradient at a given size range.According to the electromagnetic railgun armature motion model began to establish, on Electromagnetic Railgun armature motor speed is optimized using simulated annealing method in current pulse determine the circumstances; in a given track and the armature size range, the use of genetic algorithm for multi-objective optimization of electromagnetic railgun armature velocity, displacement, and the inductance gradient, we get the optimized size of tracks.