Abstract
The launched speed of projectile is one of the most important parameters in the design of railgun, in order to explore the influence of the launched speed of projectile by the length of rail and the driving current. Therefore, it is meaningful that gets the optimum speed of projectile. In this paper, main resistances (plasma viscous drag, inertial drag and air drag) was full considered in the motion process of plasma armature, and the optimization model includes the speed of the armature,driving current and the length of rail were build,then it was optimization calculated with internal penalty function method. The optimization result shows that the launched speed of projectile is maximum when the driving current and the length of rail are fixed value. The purpose lies in adjusting the width and the length of the rail and the distance between two rails so as to adjust the launched speed of projectile. The result of research laid a theoretical foundation for designing and manufacture of the railguns.
Highlights
The railgun make use of electromagnetic force to launch projectile, which breakthroughs the limit speed that the projectile is launched by traditional chemical energy
Main resistances was full considered in the motion process of plasma armature, and the optimization model includes the speed of the armature,driving current and the length of rail were build, it was optimization calculated with internal penalty function method
Since the 80s, especially in the recent ten years, with the development of new technology and material, launching launcher, launching weight, projectile speed and high efficiency power source in the railgun have reached a series of achievement (WANG Jing duan,2001)
Summary
The railgun make use of electromagnetic force to launch projectile, which breakthroughs the limit speed that the projectile is launched by traditional chemical energy. Since the 80s, especially in the recent ten years, with the development of new technology and material, launching launcher, launching weight, projectile speed and high efficiency power source in the railgun have reached a series of achievement (WANG Jing duan,2001). Fluid Physics Institute of the Chinese Engineering Academy had built the first electromagnetic rail launcher, which can accelerate the projectile weighted 0.34g to get 16.8km/s. The supervelocity of projectile possesses huge kinetic energy which greatly enhance the range and power of the weapon(Liu Wen and Li Min, 2010). The resistances (plasma viscous drag, inertial drag and air drag) in armature motion was considered, we establish the force and speed model of armature motion and optimize launcher parameters with the penalty function method
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