中文摘要：

解决轨道烧蚀问题是电磁轨道发射技术走向实际应用的关键点之一,轨道和电枢中电流的分布均匀性是造成烧蚀的主要原因之一。本文试图通过增大轨道和电枢的接触面积以达到改善接触电流分布的目的,于是提出弧形轨道结构。在不考虑速度趋肤效应的条件下,利用有限元分析软件掌握了电流密度分布规律。结果表明：一弧和多弧轨道结构可以有效地改变轨道和电枢接触面上的电流密度分布,实际发射过程中加以利用可以更好地控制电流密度的分布,有效减少电枢尾部的烧蚀。

英文摘要：

To solve the problem of rail ablation is one of the key points in electromagnetic rail technology for its practical application. Rails and armature current distribution is one of the main factors of ablation. This paper attempts to increase the contact area between the rail and the armature to achieve the purpose of improving the current distribution,and puts forward to a curved rail structure. Without considering velocity skin effect,this paper studies the current density distribution by using the finite element method. The results showed that,a multi-arc and arc rail structure can effectively change the current density distribution on the contact surface between armature and rails,and in the actual launching process it can be used to reduce the erosion of armature rail effectively.