Gyroscopic stabilization of launch package in induction type coilgun

Abstract

The aim of this paper is to study the problem of gyroscopic stabilization of the launch package in induction type coilguns. This result can be obtained by utilizing a double-feed induction coilgun which provides rotation to the launch package while it is accelerating. Such launcher is comprised of two coils, one generating a travelling magnetic field (and consequently the axial acceleration) the other a rotating magnetic field for the rotation of the projectile. Electromagnetic analysis, based on a cylindrical sheet current model, allows one to determine, as a function of the two slips (in the translation motion and in the rotation motion) all the electric, magnetic and mechanical quantities. Thermal and mechanical stress are determined too. Finally the results for a launcher, in which a 2 kg projectile is accelerated, are reported. For this application time dependence of the principal electromechanical quantities are shown. A comparison with the same launcher running as a linear induction launcher is developed too.Index Terms-Gyroscopic stabilization of the projectile, induction coilgun.

Gyroscopic stabilization of the armature in a travelling wave induction launcher

“…The armature stabilization during its in bore flight as well as during its in-air flight is an important issue in induction launcher [7]. The gyroscopic stabilization proposed in [8] represents a promising technique especially for in-air stabilization. In the TWMF-EML the presence of a 2D matrix of coils (in the axial and in the circumferential directions) can be used to produce a travelling wave whose direction of motion has components in both the axial and in the circumferential directions.…”

Application of position and inertial-rate control to a 2-DOF gyroscopic platform

“…There are many applications in which a variable orientation relative to an inertial frame needs to be controlled. Some examples are automatic aircraft control, torpedo steering mechanisms [4], gaze stabilization for visual servoing [10], planetary gear transmission systems [6], humanoid robot control [17] and amusement devices. In all of these cases, inertial stabilization requires measurement feedback from a gyroscopic sensor located on the mobile platform, which usually provides the velocity of a body with respect to the inertial frame.…”

Coil Gun Electromagnetic Launcher (EML) System with Multi-stage Electromagnetic Coils

“…Currently, various studies to minimize the radial force are under way. If the projectile is centered on the axis of the flywheel tube, the coil gun EML system has no friction and thus no problem with heat generation [4][5][6][7].…”