Mathematics – Logic
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.516s&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Mathematics
Logic
Scientific paper
The effects of gravity can be undesirable if experiments are conducted want to understand certain physical or biological phenomena or to study the complex interactions of different forces involved in a process. Although the steady residual acceleration provided by the satellite FOTON is one of the best available, the induced convection is not necessarily negligible for some class of investigations, e.g. when the characteristic time is large as in diffusion controlled phenomena. A residual gravity with small amplitude and low frequency variation exists due to the atmospheric drag, the stabilizing rotation and complex motion of the platform along the orbital trajectory. They are causing accelerations for payloads out of the center of gravity. The frequencies caused by the motions of the satellite are rather low, about f(0.3-3.1) - 10-3 Hz. Somehow the realistic values of Microgravity level was not clearly defines up to this latest study. And the post flight analysis of some experimental data has shown that the knowledge of gravity level it is really important for the complete explanations of physical phenomena. ESA, DLR, CNES and Rosaviakosmos provided the different scientific payloads on Foton-12. Besides the facilities with scientific experiments, different instruments for measuring the micro accelerations have been arranged in the re-entry module. Apart from the fact that the different accelerometers have worked at the different time intervals, any instrument has positive and negative points. These points are discussed in present study. Two external torqueses have an influence upon the spacecraft attitude motion: gravitational and aerodynamic. These momentums define the rotational and vibrational motions of the SpaceCraft with respect to the center of mass. The possible orientation of Foton-12 under influence of these two torques is suggested. The μg-levels on Foton-12 were increasing throughout the mission, although the attitude of Foton became more regular at the second part of the flight. The residual acceleration itself oscillates with a time, and the amplitude of oscillations is about 10% of the mean value.
Kazakova A. E.
Legros J.-Cl.
Melnikov Denis E.
Shevtsova Valentina M.
Verga Alberto
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