Timeline for What is the minimum number of RCS thrusters capable of stabilizing a satellite against an arbitrary rotation?
Current License: CC BY-SA 4.0
12 events
| when toggle format | what | by | license | comment | |
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| Jun 8, 2021 at 3:40 | comment | added | uhoh | I've just asked [Could this three-thruster spherical spacecraft de-tumble itself with zero final velocity? | |
| Jun 1, 2021 at 13:53 | comment | added | Joshua | @Hannes: I was unable to mix that with the principle "rotational energy can always be expressed in terms of two axes" as opposed to the expected three axes and still get a coherent result. | |
| Jun 1, 2021 at 9:59 | comment | added | Hannes | @Joshua: I think that would only be possible if the mass distribution is unequal because in the case of a sphere or a point mass the equations could be separated and it would be $$M=I\dot{\omega}=r\times F$$ and you cant use the other rotations anymore. If the mass is not symmetrical i think you are right. (Altough i am not sure if one can get rid of all the pertubations introduced at the end) | |
| May 31, 2021 at 15:00 | comment | added | Joshua | @Hannes: I think it can. If you preterb the axis of rotation by burning in some rotation you end up with the axis of rotation somewhere else that you can cancel. | |
| May 31, 2021 at 12:34 | comment | added | Hannes | I have stumbled upon the same problem and I think it could be possible to use this to get to any position you need to I think it cannot be used to decelerate any random rotation. If a rotation exists around the axis through the thruster block and the Center of the Spacecraft I think there is no way to stop that rotation? | |
| Dec 31, 2020 at 23:26 | comment | added | uhoh | This is a different question altogether, but related: Does a single off-axis thruster firing continuously eventually stabilize attitude gyroscopically? | |
| Dec 31, 2020 at 23:16 | comment | added | Joshua | @uhoh: I don't have a proof that an asymmetrical two-thruster unit doesn't work, but I couldn't get one to work. | |
| Dec 31, 2020 at 23:02 | comment | added | uhoh |
Great! Thank you :-) I have a hunch that this is the/a right answer, but it may take some time for a mathematical proof to be forthcoming. +1
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| Dec 31, 2020 at 22:46 | comment | added | Joshua | @uhoh: I tried to diagram it. I am a bad artist. | |
| Dec 31, 2020 at 22:45 | history | edited | Joshua | CC BY-SA 4.0 |
added 361 characters in body
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| Dec 31, 2020 at 22:33 | comment | added | Joshua | @uhoh: If you make a thruster block and omit one of the four thrusters a thruster block normally will have, two will be opposed and one will not be. | |
| Dec 31, 2020 at 21:36 | history | answered | Joshua | CC BY-SA 4.0 |