Analysis of in-bore magnetic field in C-shaped armature railguns

作     者：Qiang Yin He Zhang Hao-jie Li Yu-xin Yang 

作者机构：Ministerial Key Laboratory of ZNDY Nanjing University of Science and Technology 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2019年第15卷第1期

页      面：83-88页

核心收录：

学科分类：08[工学] 0826[工学-兵器科学与技术] 

基　　金：supported by the Key Basic Research Projects of Basic Strengthening Plan under Grants 2017-JCJQ-ZD-004 

主　　题：Railgun C-shaped armature Magnetic flux density 

摘      要：In order to analysis the distribution characteristics of in-bore magnetic field for C-shaped armature electromagnetic railgun, a computational model considering dynamic contact pressure is established. By solving the dynamic equation, the in-bore motion characteristics of the armature are obtained. The distribution of current in the rail and armature is analyzed based on the magnetic diffusion equation and Ampere’s law. On this basis, three simulation models are proposed, which correspond to static state,motion state and motion state considering the velocity skin effect. The magnetic field of the investigated points along the central axes of the armature front end are obtained. The results show that, in static state,the peak magnetic flux density of each investigated point is greater than the other two states. Velocity skin effect leads to a decrease in peak magnetic flux density. The change of motion state has little influence on the peak magnetic flux density of the investigated point that far away from the armature. The calculated results can be used in the electromagnetic shielding design of intelligent ammunition.