Computer Science – Performance
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jspro..15..219k&link_type=abstract
Journal of Spacecraft and Rockets, vol. 15, July-Aug. 1978, p. 219-223.
Computer Science
Performance
Attitude (Inclination), Digital Simulation, Mission Planning, Performance Prediction, Skylab 1, Spacecraft Motion, Euler Equations Of Motion, Ibm 370 Computer, Nonoscillatory Action, Orbit Decay, Reentry Trajectories, Remote Control, Solar Activity Effects, Space Shuttle Mission 31-A, Spacecraft Orbits, Teleoperators, Torque, Transfer Orbits, Tumbling Motion
Scientific paper
The objective of the 1979 Skylab revisit mission is to place Skylab into a higher orbit or on a specified re-entry trajectory through the use of a teleoperator propulsion unit. This device will be attached via remote control to the Apollo docking port, provided Skylab's attitude motion is minimal. Digital computer simulations of current and predicted Skylab attitude motion have been developed. Gravity-gradient and aerodynamic torques are the primary disturbances acting on the vehicle. Limited observations of Skylab confirm results which indicate that it is presently oscillating about a gravity gradient-stabilized mode. However, in October 1979, at least large oscillatory motion is predicted, but tumbling motion is highly likely. The expected higher solar activity and lower altitude of the spacecraft cause significant increases in atmospheric density and, therefore, larger aerodynamic torques. Uncertainties in future solar activity prevent accurate predictions of orbital life or the exact time of initiation of tumbling.
Alexander S. G.
Cwynar D. J.
Kaplan Michael H.
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