Abstract:

In order to study the influence of the support device on the energy conversion of the electromagnetic coil launcher, five different material and structure Livermore Software Technology Corporation’s Dynamic Analyzer (LS-DYNA) finite element analysis models are established, including the insulation ring column structure model, non-magnetic ring column structure model, magnetic ring column structure model, non-magnetic half ring column structure model, and magnetic half ring column structure model, to investigate the effect of the support device on the energy conversion of the internal drive coil launcher. In order to obtain the circuit characteristics of the internal drive coil launcher, a mathematical model and Maxwell finite element analysis model of the internal drive coil launcher are established, and the circuit characteristics of the launcher are solved based on the established model. By inputting system circuit data into a supported LS-DYNA finite element analysis model, the internal driving three-dimensional non axisymmetric simulation is completed, which solves the problem of Maxwell simulation software being unable to achieve three-dimensional hollow motion domain. The simulation results show that the peak velocities of the five supported launchers are reduced by 2.5%, 61.9%, 42.1%, 29.9%, and 14.7% respectively compared to the unsupported coil launchers. The results show that the influence of insulation materials on the energy conversion of the launcher can be basically ignored, while the influence of metal materials on the energy conversion of the launcher is significant. The use of magnetic high resistance materials and anti eddy current structures can significantly weaken the influence of metal support devices on the energy conversion of the coil launcher, and improve the launch performance of the coil launcher.

Key words: electromagnetic coil launcher, numerical calculation, LS-DYNA finite element simulation, energy conversion, internal drive support device