SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS

A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 44, ISSUE 3 - February 10, 2006

08 AIRCRAFT STABILITY AND CONTROL
Includes flight dynamics, aircraft handling qualities, piloting, flight controls, and autopilots.

For related information see also 05 Aircraft Design, Testing and Performance; and 06 Avionics and Aircraft Instrumentation.

20060005279 Oregon State Univ., Corvallis, OR USA

Prediction of Swerving Motion of a Dual-Spin Projectile with Lateral Pulsejets in Atmospheric Flight

Burchett, Bradley; Peterson, Allen; Costello, Mark; Nov. 1, 2005; 30 pp.; In English Contract(s)/Grant(s): W911QX-04-P-0270; Proj-622618.H80 Report No.(s): AD-A441073; ARL-CR-570; No Copyright; Avail.: CASI: A03, Hardcopy

Using the linear theory for a dual-spin projectile in atmospheric flight closed form expressions were obtained for swerving motion under the action of lateral pulsejets. Trajectory results generated by the linear theory equations and a fully nonlinear seven degree-of-freedom dual-spin projectile model agreed favorably. The analytic solution provided a relatively straight forward and computationally efficient means of trajectory estimation which is useful within smart weapon flight control systems. In order to accurately predict the impact point using the analytic solution, the dual-spin projectile linear model must be updated periodically. Terminal impact point prediction degrades rapidly as the linear model update interval is increased beyond a critical value. Control authority, as defined by the change in impact location due to a pulsejet firing, steadily decreases as a function of projectile down range position. DTIC

Flight Control; Predictions; Projectiles; Trajectories

Source: NASA