To accurately analyze the armature-rail contact characteristics of high-speed enhanced electromagnetic energy propulsion devices,a method that combines numerical calculations with experimental measurements is proposed for dynamic analysis.Firstly,a mathematical model is established between contact resistance and physical quantities such as muzzle voltage,rail current,and magnetic field.Experiments are designed to measure parameters like muzzle voltage,rail current,armature speed,and spatial magnetic field.Subsequently,the armature-rail contact resistance of the enhanced electromagnetic energy propulsion device is calculated using experimental data on muzzle voltage and rail current as well as finite element numerical simulation results.Further analysis of the armature-rail contact characteristics at different stages is conducted based on the calculated contact resistance and armature speed characteristic curve.Finally,the serviced rails are disassembled and morphologically scanned to provide validation of the reliability of the contact characteristic analysis at different stages through the scan images.The research results reveal that the armature-rail contact resistance peak at 8.5 mΩ during the initial stage,leading to severe rail damage.As the acceleration progresses to medium and high speeds,the contact resistance stabilizes around 0.78 mΩ,indicating a consistent and stable armature-rail contact state.However,at the high-speed exit stage,the contact resistance exhibits significant fluctuations,resulting in poor electrical contact stability.This research offers fundamental data and a reliable reference for further research on rail wear and system performance enhancement in high-speed electromagnetic propulsion devices.
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