RE: Solar array configurations

From: Lloyd Wood (l.wood@eim.surrey.ac.uk)
Date: Tue Dec 24 2002 - 17:49:25 EST

  • Next message: Matson, Robert: "More on GEOSAT solar arrays"

    On Tue, 24 Dec 2002, Matson, Robert wrote:
    
    > > They're the same thing - and they rotate the same.
    
    to be clear - the panels rotate the same to follow the sun.
    They're topologically equivalent - with equivalent moments of inertia.
    
    L.
    
    >
    > I think you're missing the point.  As far as how a *dead* satellite
    > ends up spinning, they are most definitely NOT the same thing.  How
    > the arrays articulate is immaterial.  If the X-axis in these
    > diagrams points to the right (in the plane of your monitor) and
    > the Y-axis points up (also in the plane of your monitor), then the
    > "I" configuration will always end up spinning around either the
    > Y-axis (paddlewheel fashion) or Z-axis (flat spin) as I have it
    > drawn.  The "H" configuration has moments of inertia that are
    > less clear, and could end up rotating about the X-, Y- or Z-axes
    > or anything in between depending on the masses and dimensions.
    >
    > H-configuration (S = satellite body)
    >
    >  ***       ***
    >  * *       * *
    >  * *  SSS  * *
    >  * *--S S--* *
    >  * *  SSS  * *
    >  * *       * *
    >  ***       ***
    >
    >
    > I-configuration
    >
    >  **************  SSS  **************
    >  *            *--S S--*            *
    >  **************  SSS  **************
    >
    > The vast majority of communications satellites have the I-configuration,
    > probably because it simplifies array deployment.  See the following
    > Loral site showing all their GEO spacecraft in orbit:
    >
    > http://www.ssloral.com/html/satexp/onorbitpic.html
    >
    > --Rob
    >
    
    <http://www.ee.surrey.ac.uk/Personal/L.Wood/><L.Wood@ee.surrey.ac.uk>
    
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