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, speed resistance, current resistance, and multifactor resistance, 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, the self-inductance gradient (L ´r) was 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 models indicated that an appropriate resistance model according to the experimental condition can improve the accuracy of simulation analysis. The friction coefficient resistance model can describe armature resistance during the movement process in both low- and high-velocity cases.