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During the electromagnetic launch process, there is a contact surface between the trailing arm of C-shaped armature and the rail. This contact is generally provided by the deformation of the trailing arm, from which can keep a good metal-metal contact at the armature-rail interface, while providing sufficient contact force to ensure the launch without transition. Nowadays C-shaped armatures with curved...
Low efficiency of energy utilization is one of the most important bottlenecks for the electromagnetic railgun to go into application. While any improvement in emission efficiency presents amplifying effect in saving the overall energy, so it is very necessary to reduce aerodynamic losses generated during the projectile emission. In this paper, the view of interior ballistic aerodynamic losses in the...
A distributed energy store (DES) railgun concept was first proposed by Marshall, which excels at higher efficiency, in comparison with a breech-fed one. And it had been testified to lessen the energy remaining in the rails and lower the rails' resistive loses during the past three decades. Yet, the improvement in efficiency from DES principle may not be remarkable unless the resistance of the rails...
In this paper, the measurement of the in-bore position and velocity of the armature is performed using B-dot probes. 9 B-dot probes are installed in the rail-to-rail insulator at different distances from the breech. Based on some simplifications of the current flowing in the armature, the magnetic flux formula of the probe is derived. It is found that when the armature passes by the probe, the ratio...
Inductance gradient of railgun is one of the most important parameters to railgun launch efficiency. The inductance gradient of simple railgun without metal container (tube) can be calculated via Kerrisk's approximate formula when the structure of rails is fixed. However, the metal container would be necessary if the repulsion on the rails is great enough in mega Ampere current railgun. Then eddy...
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