The authors present a calculation in a simplified geometry for the current distribution in the rails of a railgun, taking into account the motion of the armature and the time variation of the current. Closed-form, asymptotic results for the current density are obtained for arbitrary time-dependent currents and velocities, in the limit in which the length scale k0-1 is small, where k0=( mu sigma nu ), sigma is the electrical conductivity of the rails, and nu is the speed of the armature. Because of eddy-current effects the rail current may reverse in portions of the rails when the total current decreases. The current is used as a source of Joule heating to find the temperature distribution in the rails. The heat diffusivity is negligible. Numerical results concerning melting are given
Skin and heating effects of railgun current
Skin- und Erwaermungseffekte von Railgun-Stroemen
1989
6 Seiten, 10 Quellen
Article (Journal)
English
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