During transfer orbit the vehicle comprised of EXOSAT and the ARIANE fourth stage is unstable due to rotation around the axis of least inertia. The principle cause of this divergence in the angular movement is directly related to the behavior of onboard liquids (two liquid propane tanks and a hydrazine tank with a diaphragm, representing approximately 4% of the total mass). For each type of tank the principle modes affecting the vehicle are modeled and the divergence time constant is evaluated. Results are used to formulate propositions for ground tests. One test involves a turning table for determining the sloshing frequency of the hydrazine tank while another employs gas bearing and is to be used for both the hydrazine and propane tanks.


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    Title :

    Influence des Liquides Embarques sur la Stabilite du Vehicle Exosat Plus Quatrieme Etage d'Ariane en Orbite de Transfert (Influence of Onboard Liquids on the Stability of Exosat Plus the Ariane Fourth Stage During Transfer Orbit)


    Contributors:

    Publication date :

    1979


    Size :

    75 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English