Electromagnetic railgun contact resistance simulation study

Electromagnetic launch technology has the advantages of fast launch speed, long effective range, high anti-overload ability, obvious damage effect, anti-saturation attack, good hit accuracy and low cost. However, the damage caused by Joule heat generated by large current reduces the launch accuracy of the load and greatly shorens the service life of the orbit, which seriously restricts the development of electromagnetic launch technology. In this paper, by establishing the mathematical model of electromagnetic rail gun and building simulink simulation model based on it, we get the conclusion that the contact resistance decreases continuously along the rising current, increases slowly in the current flat phase and the beginning of the falling edge, and grows rapidly in the late current falling edge.