摘要
轨道起始段良好的电接触性能是确保轨道炮正常发射的必要条件。为增强起始段枢轨电接触性能,从枢轨接触面和接触压力两方面对C形一体电枢结构进行优化设计。利用高频涡流仿真方法计算分析接触面对电枢电磁特性的影响,获得电枢电流密度以及电磁受力曲线,通过对比分析获得最优枢轨接触面大小与位置。为避免电枢在起始运动中出现接触失效问题,对传统接触压力设计方法“安克法则(1g/1A)”进行修正优化,形成“安克法则”瞬态应用方法,有效地模拟接触压力瞬态变化特性。应用该方法计算不同接触面的枢轨接触压力,获得的接触压力曲线均在某临界直线如“1g/1A”曲线之上,结果表明枢轨接触良好。基于“安克法则”瞬态应用方法设计的电枢在最优接触面下进行5发试验,实现了较好的起始段电接触性能。以上结论可供未来电枢设计时参考。
The proper electrical contact performance in the initial section of rail is the necessary condition to ensure the normal firing of railgun. In order to enhance the electrical contact performance, an optimal design of C-shaped monolithic armature structure is proposed from two aspects of contact surface and contact pressure. The influence of contact surface on the electromagnetic characteristics of armature is analyzed to obtain the current density and electromagnetic force curves by using high frequency eddy current simulation method. The optimum size and position of contact surface are obtained through comparison and analysis. In order to avoid the contact failure during initial motion, the traditional contact pressure design method (“1 g/1 A”) was modified and optimized to form a transient application method of “1 g/1 A”. The proposed method can be used to simulate the transient characteristics of contact pressure effectively. The proposed method is applied to calculate the contact forces on the different contact surfaces during the initial stage of launching. The calculated results show that the contact force curves of armature and rail are all above the equivalent“1 g/1 A” force curve, which proves that the method can ensure a proper contact between armature and rail. The armature designed by using the transient application method of “1 g/1 A” was tested under the optimal contact surface, in which the better electrical contact in the initial section of rail was achived.
作者
范薇
苏子舟
范天峰
张涛
张洪海
刘勇
FAN Wei;SU Zizhou;FAN Tianfeng;ZHANG Tao;ZHANG Honghai;LIU Yong(Northwest Institute of Mechanical and Electrical Engineering, Xianyang 712099, Shaanxi, China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2019年第10期1969-1976,共8页
Acta Armamentarii
基金
陕西省创新能力支撑计划项目(2018KJXX-039)
关键词
电磁轨道炮
C形电枢
枢轨接触面
电枢结构
接触压力
数值计算
发射试验
electromagnetic railgun
C-shaped monolithic armature
contact surface between armature and rail
armature structure
contact force
numerical calculation
electromagnetic launch experiment
