Analysis and Experimental Verification of Contact Characteristics Between Armature and Rail Based on Dual Parameter Changes

In the process of electromagnetic launching, in order to address the issue of varying degrees of sliding electrical contact erosion caused by different contact areas, when the armature mass is fixed, a dual parameter static contact model between rail and armature is established by adjusting the inclination angle of the contact surface and the interference amount of the tail wing, and the actual contact areal is corrected. The thermal power per unit area of the armature under different contact states is calculated through the contact resistance of the contact surface, Theoretical analysis was conducted on the degree of armature erosion, and the evolution process of armature erosion was verified through dynamic emission tests. The research results indicate that using a large area contact method can effectively reduce the adverse effect of eddy current effect on armature erosion during the launch process. Designing the length of the armature rail contact area to two-thirds of the tail wing length has good ablation characteristics. Therefore,in the process of armature design, large area contact should be used as much as possible, and this research result can provide guidance for the optimization and improvement of armature structure in the later stage.