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I Artificial Gravity On ISS

  1. Nov 1, 2016 #1
    When International Space Station is at rest, it revolves around it's axis once per orbital revolution (92.65 minutes). In other words, is tidally locked. Does the spinning around it's axis do create non-zero artificial gravity? Does it have non zero angular momentum?
    Last edited: Nov 1, 2016
  2. jcsd
  3. Nov 1, 2016 #2

    Jonathan Scott

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    Gold Member

    The environment in the ISS is described as "micro-gravity", which means that gravitational effects are roughly of the order of a millionth of the gravitational field of the Earth. These effects include tidal effects (the higher side experiences a slightly weaker gravitational field than the lower side), centrifugal effects (the higher side is accelerating around the orbit slightly faster than the lower side and gravitational effects due to the local masses of the station components and occupants. Most of these effects are larger the further from the middle of the station.

    The relative effect of spinning around its own axis during an orbit is a small part of that. You should be able to calculate the acceleration from ##r \omega^2## where ##r## is the distance from the axis of the rotation and ##\omega## is the angular velocity (##2 \pi## radians per ##93 * 60## seconds).
  4. Nov 1, 2016 #3
    A pointer. Not an actual answer to your question but since you mentioned,
    Tidally locked is an effect of only gravity.

    The ISS uses what is called TEA - Torque equilibrium Attitude - for its orbit.
    Where the effects of gravity and drag from the atmosphere will tend to cancel each other out.

    Better explanation here,
    ( where else, at PF )

    Active control comes from gyros and propellant,
    http://www.boeing.com/assets/pdf/defense-space/space/spacestation/systems/docs/ISS Motion Control System.pdf

    Some data on the orbit, attitude variation,
    Section 3.2 Page 14
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