Aero-Elastic Motion of a Spin-Stabilized Projectile

Report No. ARL-TR-3453
Authors: Charles H. Murphy and William H. Mermagen, Sr.
Date/Pages: March 2005; 40 pages
Abstract: The elastic flight motion of a slowly spinning finned missile has been successfully described by the finite element method (FEM). With the addition of a Magnus force distribution function, this analysis was used to describe the elastic flight motion of a spin-stabilized projectile. Transient frequencies and damping rates for a 10-cal. cone cylinder have been calculated. The elastic frequencies for a rapidly spinning projectile can be substantially different from those for zero spin. A slightly bent projectile can have a large deflection when its spin rate is near an elastic frequency. Resonant motion is demonstrated when the spin is near the first positive elastic frequency. The maximum strain associated with this motion can exceed the plastic limit.
Distribution: Approved for public release
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Last Update / Reviewed: March 1, 2005