Dynamics and control of tethered formation flight spacecraft using the SPHERES testbed

Soon Jo Chung, Edmund M. Kong, David W. Miller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper elaborates on the theory and experiment of controlling tethered spacecraft formation without depending on thrusters. In dealing with such underactuated systems, much emphasis is placed on complete decentralization of the control and estimation algorithms in order to reduce the dimensionality and complication. The nonlinear equations of motions of multi-vehicle tethered spacecraft are derived by Lagrange's equations. Decentralization is then realized by the diagonalization technique and its stability is proven by contraction theory. The preliminary analysis predicts unstable dynamics depending on the direction of the tether motor. The controllability analysis indicates that both array resizing and spin-up are fully controllable only by the reaction wheels and the tether motor, thereby eliminating the need for thrusters. Based upon this analysis, gain-scheduling LQR controllers and nonlinear controllers by feedback linearization have been successfully implemented into the tethered SPHERES testbed, and tested at the NASA MSFCs flat floor facility using two and three SPHERES configurations. The relative sensing mechanism employing the ultrasound ranging system and the inertial gyro is also described. copyright

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - AIAA Guidance, Navigation, and Control Conference 2005
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages2553-2578
Number of pages26
ISBN (Print)1563477378, 9781563477379
DOIs
StatePublished - 2005
EventAIAA Guidance, Navigation, and Control Conference 2005 - San Francisco, CA, United States
Duration: Aug 15 2005Aug 18 2005

Publication series

NameCollection of Technical Papers - AIAA Guidance, Navigation, and Control Conference
Volume4

Conference

ConferenceAIAA Guidance, Navigation, and Control Conference 2005
Country/TerritoryUnited States
CitySan Francisco, CA
Period8/15/058/18/05

ASJC Scopus subject areas

  • Engineering(all)

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