Modeling of the aerodynamic moment acting upon a satellite |
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Authors: | A I Maslova A V Pirozhenko |
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Institution: | 1.Institute of Technical Mechanics,Ukranian National Academy of Sciences,Dnepropetrovsk,Ukraine |
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Abstract: | We consider the issues of modeling the moments of aerodynamic forces acting upon a satellite with gravitational system of
stabilization. It is assumed that satellite orbits are almost circular with heights in the range 550–750 km. Simplified analytical
expressions are suggested for the aerodynamic moment in the case when a satellite moves in the regime of gravitational orientation.
Accuracy of the obtained expressions is estimated to be compared with that of expressions derived under the assumption of
constant coefficient of frontal resistance. An analysis is made of short-periodic variations of the atmosphere density occurring
due to orbital motion of a satellite. It is demonstrated that these variations can result in a substantial change of the aerodynamic
moment, and their approximation by a truncated Fourier series is suggested. Estimates of the accuracy of the suggested approximation
are given. |
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