The INTELSAT VIII / VIIIA program consists of six communication satellites (of two different designs) being produced by Lockheed Martin Astro Space for the International Telecommunications Satellite Organization (INTELSAT). Two spacecraft level thermal vacuum test facilities were required to test the first four spacecraft due to schedule constraints. The two facilities selected were the East Windsor, NJ (EW) 35 foot chamber and the 39 foot chamber at Lockheed Martin's Valley Forge, PA (VF) facility. INTELSAT 801 was tested in the EW 35 foot chamber which utilizes eight independently controlled shrouds to perform IR (hot wall) testing over an environmental temperature range of -180 to +80°C. INTELSAT 802 was tested in the VF 39 foot chamber which consists of shrouds flooded with LN2 at -180°C. Cal rods were used to independently control the thermal environments of the six spacecraft faces for this facility. A typical cal rod test approach measures cal rod fluxes via calorimeters at discrete locations and controls the applied fluxes based on a correction from the calorimeter to Optical Solar Reflector (OSR) or blanket thermo-optical properties. For INTELSAT 802, an equivalent sink test approach was developed for use with the cal rod test setup. A calibration of equivalent sink temperature to cal rod power was performed for each face of the cal rod test assembly. Three thermal balance cases, simulating equinox beginning of life, winter solstice end of life, and inverted spacecraft winter solstice end of life were common to the 801 and 802 test profiles. A comparison of these three balance cases confirms that the developed cal rod equivalent sink test technique is a good substitute for the hot wall test approach when chamber multiple zone temperature control is unavailable.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    A Comparison of INTELSAT VIII Spacecraft Thermal Vacuum Test Techniques


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Conference On Environmental Systems ; 1997



    Erscheinungsdatum :

    1997-07-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    A comparison of Intelsat VIII spacecraft thermal vacuum test techniques

    Mackey, R. J. / Bouchez, J.-P. | British Library Online Contents | 1997


    A comparison of Intelsat VIII spacecraft thermal vacuum test techniques

    Mackey, R. J. / Bouchez, J.-P. / European Space Agency | British Library Conference Proceedings | 1997


    INTELSAT VIII

    Neyret, P. / Nadkarni, P. / Rush, T. et al. | AIAA | 1994


    Intelsat-VIII spacecraft antenna testing using the Dornier compact range

    Jensen, Lars / Steiner, Hans-Juergen | AIAA | 1996


    INTELSAT V spacecraft design

    Rusch, R.J. / Dwyre, D.G. | Elsevier | 1977