Akademik Veri Yönetim Sistemi
50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, Nashville, TN, Amerika Birleşik Devletleri, 9 - 12 Ocak 2012, (Tam Metin Bildiri)
The paper discusses dynamics and control issues related with hover-to-cruise transition maneuver of a small unmanned air vehicle (UAV) designed for operations in confined spaces and cluttered terrains with precise altitude hold. Specifically, a concept of 'aerodynamic vectoring' is formulated such that the angle of incidence of the wing is dealt as an independent control variable. The aircraft motion is studied in longitudinal mode. A nonlinear constrained optimization scheme based on Sequential Quadratic Programming (SQP) is used to generate the optimal maneuver motions. Then, the open-loop stability of the transition maneuvers is studied using, a recently developed tool in nonlinear control, contraction theory. Subsequently, the nonlinear control synthesis is carried out using feedback linearization for two configurations - conventional UAV and 'aerodynamic vectored' UAV. Finally, the transition maneuver simulation with and without aerodynamic vectoring is carried out. The control architecture shows avoidance of singularities and improvement in performance in terms of agility and control from the proposed aerodynamic vectoring during the transition maneuver. Copyright © 2012 by Adnan Maqsood & Tiauw Hiong Go.