Spacecraft Spin Rate Change due to Propellant Redistribution Between Tanks

Details Spacecraft Spin Rate Change due to Propellant Redistribution Between Tanks Spacecraft Spin Rate Change due to Propellant Redistribution Between Tanks

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jass....1...23c&link_type=abstract

Journal of Astronomy and Space Science, vol. 1, no. 1, p. 23-34.

Astronomy and Astrophysics

Astronomy

Scientific paper

A bubble trapped in the liquid manifold of INTELSAT IV F-7 spacecraft caused a mass imbalance between the System 1 propellant tanks and a wobble half angle of 0.38 degree to 0.48 degree. A maneuver in May 14, 1980 passed the bubble through the axial jet and allowed propellant to redistribute. A 0.2 rpm change in spin rate was observed with an exponential decay time constant of 6 minutes. In this paper, moment of inertia, tank geometry and hydrodynamics models are derived to match the observed spin rate data. The values of the total mass of the propellant considered were 16, 19 and 20 Kgs with corresponding mass imbalances of 14.3, 15 and 15.1 Kgs, respectively. The result shows excellent agreement with observed spin rate data but it was necessary to assume a greater mass of hydrazine in the tanks than propellant accounting indicated.

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