The assembly accuracy of electromagnetic rail-gun barrel directly affects the sliding electrical contact state of the central rail during the launch process.To analyze the impact of barrel assembly accuracy on the dynamic launch of the armature,typical changes in barrel spacing were extracted based on the measured values of barrel spacing,and a dynamic model of armature internal ballistic launch under typical shapes was established.The impact of barrel size changes on the force and vibration of the armature during the launch process was theoretically analyzed.The theoretical analysis conclusions were verified through dynamic launch tests under real working conditions and static sliding contact tests on the pivot rail.The research results indicate that the random variation of bore spacing can lead to asymmetric contact between the armature and the track during the launch process.When the bore spacing decreases,the contact area between the armature and the track will undergo a process of increasing from small to large.This process is beneficial for increasing the contact area between the armature and the track.As the bore spacing increases,the contact area between the armature and the track gradually decreases,causing excessive current to flow through the local area.When the assembly accuracy error of the bore exceeds 0.2 mm,the caused fluctuation in the spacing between the inner chambers can lead to uneven force distribution on the armature during the launch process,and also generate lateral additional vibration on the armature,which is one of the main reasons for the high-speed movement and disintegration of the armature chamber.Analysis on the impact of gun bore assembly accuracy on the armature launch process is of great significance for effectively guiding the design of armature rail matching and promoting the future engineering application of electromagnetic guns.
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