Research of the resistance model in solid armature railgun

During the past few decades, various calculation models have been introduced into studying solid armature railgun. In this paper,four models, including constant resistance model, speed resistance model, current resistance model and multi-factor resistance model, were studied in detail. To verify their validity, experimental and simulation methods were adopted in both low and high velocity cases. By conducting a 3-D eddy current electromagnetic field simulation with the finite-element numerical method, self-inductance gradient (L_r´) is got. The control equations of these different resistance models can be solved by the Runge-Kutta method. Comparisons of experimental and simulation results of these different resistance methods indicate that friction coefficient resistance model can describe armature resistance during the movement process of solid armature and improve the accuracy of simulation analysis in both low and high velocity cases.