The Structure Design And Contection Research About Some Typical Solid Armature

With the high level of velocity and the large range, electromagnetic railgun leads a way of furture wapeans.Transition is a kind of normal phenomenon that usually happens in lauching. Transition is the main reason that leads to breaking rails and affects lauching. Armature is the major component of electromagnetic railgun. A rational structure of the rail and armature can efficiently avoid transition, improve the lifetime of rails and the accuracy of lauch. So optimize the structure of armature and rail is very meaningful.First part, the over-fixation massure is calculated, used cantilever beam model, then by the equal section method, the same quality distributed H-shaped armature with different contect surface is designed. Three typical H-shaped armature is analyzed, and stress condition, contact pressure, is conpared, drawed a conclusion that concave-shaped armature is much more rational.Second part, four main shape parameters of the flat H-shaped armature are optimized, the result is analyzed, concluded that the lenth of the front plane, the distance between saddle-shaped surface and the tail of the armature are two parameter that can adjust the max stress of the armature.And then, four main parameters of the upwarped cylinder armature are optimized, concluded that the height of the saddle-shaped surface of the armature is the parameter that can adjust max stress and max contact pressure of the armature.Last part, the armature placed at 600 mm front of the rail is analyzed by transient solution, got the current-time curve and force-time curve of one to four layers of the rail. Secondly, the effect of different situations of the armature in the rail to the force of armature and current in the rail are compared. In the end, the electric current density, magnetic induction intensity and direction in the armature are analyzed, result in that in the same stimulate of the pulse shaping circuit, two and three layers railgun are most efficient, and the more layers the more steady the current are.