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Nonlinear Control in Aerospace

Future spacecraft are envisioned to operate under very stringent pointing specifications, and will have increased power requirements. Such design objectives impose constraints at the controller design level. A method to address both of these problems has been proposed recently via the use of flywheels as mechanical batteriesboth for attitude control and energy storage on board the spacecraft. Recent US Air Force studies, in fact, have predicted mass savings of the order of 30-40% using such an integrated power and attitude control system (IPACS). In this work we propose a series of nonlinear control designs for an IPACS using variable speed single-gimbal control moment gyroscopes (VSCMGs). These control algorithms perform both the attitude and power tracking goals simultaneously, and without sacrificing any of the original, separate attitude/power operational specifications. Both model-based and adaptive controls laws for a VSCMG cluster will be presented, along with a complete singularity analysis, including appropriate singularity avoidance strategies. Control modules to stabilize a spacecraft when one or more VSCMG actuators fail will also be given. The success of the proposed control designs will be demonstrated through numerical simulations and experimental tests on the three-axial spacecraft simulator of the DCSL lab at Georgia Tech.
Type of Seminar:
Public Seminar
Prof. Panagiotis Tsiotras
Georgia Institute of Technology, Atlanta, USA
Dec 20, 2005   16:30

ETH-Zentrum, Main Building Room HG F 33.1 , Rämistrasse 101, Zurich
Contact Person:

Prof. L. Guzzella
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