A Magnetic-Guideway/Guided-Projectile System Concept for Aeroballistic Ranges
Final rept. Jul 1973-Feb 1976
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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A system concept for the incorporation of magnetic projectile guidance into aeroballistic ranges is presented and analyzed. Basis of the concept is motion-induced, electrodynamic interaction between conductive material in the projectiles forebody and a guideway of field source currents. Theory is developed for deployment of the currents such that on the one hand the forebody will be repulsed toward the guideway centerline as a function of error in lateral position whereas, on the other hand, there will be damping of resulting lateral motion. Expressions are subsequently derived which interrelate the magnitude of forces to the magnitude of guideway currents, and generalized equations of motion for the projectile are developed with both electrodynamic and aerodynamic forces being considered. A design example is included wherein the developed theory is correlated to an existing aeroballistic range AEDCVKF Range G where projectiles with base diameters on the order of 0.05 m are launched at velocities of 4,000 to 6,000 msec. Results are gratifying in that computed flight paths for varying conditions indicate that stable guided flight can be achieved with guideway currents of reasonable magnitude. Practical means of providing these are discussed.
- Electricity and Magnetism