The Electromagnetic Force Distribution and the Structure Optimization in Serial Augmented Electromagnetic Launcher
In augmented electromagnetic(EM) launcher one or more pairs serial sub-rails are used to enhance the inductance gradient of rails to speed up the armature, in which the force distribution acting on rails and armature is more complicated than that in single-pair-rail EM launcher. In this paper, a numerical simulation model of interaction force between rails and accelerative force acting on armature is established based on Maxwells electromagnetic equations and circuit equations to disclose the correlation between the force distribution and the number of sub-rails in augmented EM launcher. With same power supply, the more sub-rails pairs are used, the greater inductance gradient is and the smaller current in rails is. The simulations show at peak current the forces on rails and armature have not always been enhanced with the increase of sub-rail pairs. There is other source existed which could increase of bearing force of armature with the increase of sub-rails pares in different geometry. The simulations results also indicate that in double-layer augmented EM launcher, the sub-rails effectively enhance the armature force and magnetic flux density. However in three-layer augmented EM launcher, no obviously positive relationship between the rails layers and the bearing force of rails and armature has been found out. When the outside excitation is constant, it should be considered that the electromagnetic field is weakened with the eddy current increasing and total current decreasing.
electromagnetic launcher railgun simulation force distribution
Xiaoting Peng Zaiji Zhan
State Key Laboratory of Metastable Materials Science YanShan University QinHuangDao, China College of Science and Engineering YanShan University QinHuangDao, China
国际会议
太原
英文
485-489
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）