Simulations and Experiments of EMFY-1 Electromagnetic Launcher

Abstract

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Electromagnetic Launcher Speed Control with a Multilevel Fast Triggering Time Algorithm (MFTTA)

“…The detailed analysis of EMLs requires 3-D Finite Element Method (FEM) simulations. However, optimizations with 3-D FEM are time-consuming; thus, appropriate simplifications should be made to have reasonable computation time [16]. In this section, these simplifications and the construction of the 1-D EML model is explained.…”

“…As stated in [16] and [17] the L EML has two components. L ext is the inductance between the rails and L int is the inductance component inside the rails.…”

“…In this study, special attention to L calculation is given due to precise transient modeling. A 3D FEM model is performed to investigate the following theorem, which is similar to the study in [16] and [17]. The variation of L with different rail current pulses needs to be analyzed.…”

Optimization of a Convex Rail Design for Electromagnetic Launchers

“…speed of the armature increases, the velocity skin effect (VSE) starts to dominate the current distribution in the rails and armature. The influence of the VSE phenomenon on the current density distribution is discussed in [13]. Due to these effects, the current density increases at the trailing edge of the armature on the contact surface.…”

A Comparison of Velocity Skin Effect Modeling With 2-D Transient and 3-D Quasi-Transient Finite Element Methods

“…Then, the VSE resistance is calculated in 3-D with quasi-transient FEM. The fitted VSE resistances are added to the 3-D static FEM simulations like in [12], [13] individually as a figure of merit. The constructed model is compared with experimental results to evaluate the performances of VSE models.…”