Abstract
To explore influences from drive current on the projectile launched speed, and the spacing and width of rails on the maximum value of current in the electromagnetic gun. The motion equation of plasma armature is analyzed by the Newton method. In this paper, considering armature motion subjected to plasma viscous drag and inertial drag, the optimization model between armature speed and drive current was built. The results showed that the projectile launched speed would get the maximum value when the drive current was the specific value. Moreover, the influences from spacing and width of rails on the maximum value of current and the projectile launched speed were proved. Therefore, the optimization model that was built by the Newton method research the electromagnetic railgun is of great significance.
Highlights
The electromagnetic launcher makes use of ampere force to accelerate driving projectile, so far it has a century
While the velocity of the conventional cannon is only 2km/s, which is so closed to the limitation of physics that the range is not possible to be farther
The projectile can be accelerated to several kilometers or even to dozens of kilometers in one second, for it possesses huge kinetic energy which greatly enhances the range and power of the weapon (Liu Wen and Li Min, 2010)
Summary
The electromagnetic launcher makes use of ampere force to accelerate driving projectile, so far it has a century. With electromagnetic forces push projectile, the projectile can reach very high acceleration. Such as Dr Richard Ashleigh and Dr John Barber in the Australian national university used the generator and plasma armature to accelerate a carbonic acid projectile weighed 3g to 5.9km/s in 1978. Fluid Physics institute of the Chinese Engineering Academy had built the first electromagnetic rail launcher, which can accelerate the projectile weighted 0.34g to 16.8km/s. About the model problem of the velocity of a projectile, Parker thinks speed of electromagnetic railgun relates to chamber wall ablation and increased plasma mass; Ray introduced the resisting force relates to speed from angle of motion resisting force. In this paper, combining with method of Parker and Ray, they put forward the forces and speed model of an armature movement, and by Newton method to optimize calculation
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