Progress in the study of spacecraft dynamics and control at the University of Toronto Institute for Aerospace Studies is reviewed. An upgrade to the Daisy Research Facility, designed to investigate control of flexible spacecraft, is underway. A multibus II real-time computer system, new reaction wheel controllers, and power amplifiers are being integrated into Daisy. The GHM (Golla, Hughes, McTavish) theory, a complete procedure for incorporating viscoelastic material properties into structural finite elements, is complete. This representation of material behavior provides a more realistic model of damping characteristics than current models and retains the matrix second order form of the equations of motion. Viscoelastic modulus data have been measured for use in a GHM finite element model of a truss structure. A study on the control of large space structures using a distribution of gyricity is complete. The resulting control systems are very successful in suppressing structural vibration. An analytical examination of the adverse effects of time delays introduced by a computer on the control of flexible space structures has been undertaken. Work aimed at reducing the order of both the structural model and the control system when controlling flexible structures is continuing. A technique has been developed in which balanced Grammian matrices provide the basis for deleting certain state variables associated with the controller.
Spacecraft Dynamics and Control
1989
2 pages
Report
Keine Angabe
Englisch
Unmanned Spacecraft , Manned Spacecraft , Control systems design , Flexible spacecraft , Spacecraft control , Structural vibration , Vibration damping , Viscoelasticity , Dynamic structural analysis , Numerical control , Dynamic stability , Real time operation , Spacecraft motion , Foreign technology , Large space structures
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