Abstract
Aiming at the nondestructive recovery of ultra-high-speed armature of electromagnetic railgun, a mathematical model of fluid medium for recovery is established based on fluid damping theory. At the same time, the fluid-solid coupling finite element model is constructed, and then the numerical calculation is carried out. Furthermore, the recovery characteristics of different armature speed under different density medium are analyzed, and then the relationship between the armature initial velocity and the maximum density of medium is given. Additionally, the overload limit of aluminum armature is obtained. Finally, the overall scheme of variable density segments is proposed. The experimental system is built and verification experiments are carried out. The research results show that by using piecewise recovery method, low-density medium is selected for the front part and high-density medium is selected for the rear part, the problem of too long distance or too much overload when a single medium for recovery can be solved. Meanwhile, the nondestructive recovery of armature can be realized, and the appearance of armature can be maintained.
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