The contact state between the rail and armature is affected by the electromagnetic force

velocity and temperature in launching process. The performance of the sliding contact and launching is affected by the temperature rise under continuous fire mode. The rail has different initial temperature with the electrical heating unit. The launching experiments were performed under the conditions of the same driving current

armature type and mass. The results of contact resistance

velocity and temperature rise can be obtained with the measurements of muzzle voltage

driving current

B-dot signals and temperature rise before and after launching. The contact performance

muzzle velocity

and temperature rise can be analyzed by the results under different initial temperature of the rails. It can be obtained that

with the initial temperature rise

the track resistance increases

the rail temperature rise increases correspondingly

the interface contact resistance increases

and the armature initial speed decreases.