Akademik Veri Yönetim Sistemi
AIAA Information Systems-Infotech At Aerospace Conference, 2017, Texas, Amerika Birleşik Devletleri, 9 - 13 Ocak 2017, (Tam Metin Bildiri)
Dynamic soaring is the process of acquiring energy available in atmosphere vertical wind gradients and is commonly exhibited by soaring birds. Dynamic soaring maneuvers have been investigated in the past for formulating optimized trajectories for powered/unpowered aerial vehicles having fixed platform configuration. Analysis of soaring bird flight, however, reveals that soaring maneuver is performed under morphing condition, as the bird rest on its wings with a shoulder lock and skillfully varies wing planform and twist. This clearly indicates that a biologically inspired aerial platform with the capability to morph will best imitate bird flight and will be able to acquire maximum energy from the atmosphere by adapting to the most befitting configuration during the maneuver. In this paper, we are presenting preliminary results of a study for implementing dynamic soaring for a morphing capable UAV which can modify its planform configuration by varying wing sweep. Three-dimensional point-mass UAV equations of motion and linear wind gradient profile are used to model flight dynamics. Utilizing UAV states, controls (both conventional and morphing), operational constraints, initial and terminal conditions that enforce a periodic flight, the dynamic soaring problem is formulated as non-linear optimal control problem. Numerical solutions with morphing are obtained to evaluate distant UAV performance parameters. A comparative analysis is subsequently carried to determine the benefit of morphing over fixed-wing configurations.