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Unformatted text preview: Advanced ADCS Final Presentations Randolph 210 1012 AM, December 1516, 2003 Monday December 15, 2003 10:00 10:25 Optimal Control of A Solar Sail Spacecraft for Interplanetary Missions Mischa Kim The theory of optimal control is applied to obtain minimumtime trajectories for solar sail spacecraft for interplanetary missions. We consider the gravitational force and torque due to the Sun as well as the solar radiation force and torque considering effects such as photon absorption, specular and diffuse reflection. The spacecraft is symmetrically modelled as a point mass m p rigidly connected to a flat, square sail of mass m s . Coplanar circular orbits are assumed for the planets. We solve the optimal control problem via an indirect method using an efficient algorithm based on a cascaded computational scheme. The global optimizer is based on a technique called Adaptive Simulated Annealing. A Quasi-Newton Method performs the terminal fine tuning of the optimization parameters. 10:25 10:50 Coupled Orbital and Attitude Control Simulation Scott Lennox Coupling the attitude and orbital control systems is required for some formation flying missions because of the formation operation requirements or because of the physical constraints of small spacecraft. A nonlinear Lyapunov attitude controller for a spacecraft with three-axis momentum wheels is derived and proven to be globally asymptotically stable. Athree-axis momentum wheels is derived and proven to be globally asymptotically stable....
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This note was uploaded on 01/01/2012 for the course AOE 5984 taught by Professor Devenport during the Fall '08 term at Virginia Tech.
- Fall '08