Aerodynamic stabilization of satellites

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Discussion Overview

The discussion revolves around the concept of aerodynamic stabilization of satellites, particularly in the context of low Earth orbit. Participants explore the implications of aerodynamic forces and torque on satellite stability, as well as the challenges in finding relevant literature on the topic.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant seeks assistance on aerodynamic stabilization of satellites but expresses difficulty in finding accessible information.
  • Another participant suggests searching for "torque equilibrium attitude" as a potential avenue for research.
  • A participant questions the use of "aerodynamic" in the context of space, noting the absence of air and asking for clarification on the type of stability being researched (spin stability vs. orbit stability).
  • There is a discussion on the relevance of atmospheric drag in low Earth orbit, with one participant arguing that aerodynamic effects are significant due to the exoatmosphere extending beyond low Earth orbit.
  • Several approaches to managing atmospheric drag are proposed, including torque equilibrium attitude, minimum drag attitude, and a more pragmatic "Ah f*** it" attitude that accepts the need for fuel expenditure to maintain mission parameters.

Areas of Agreement / Disagreement

Participants express differing views on the applicability of aerodynamic concepts in space, with some arguing that the term is odd while others assert its relevance due to atmospheric effects in low Earth orbit. The discussion remains unresolved regarding the specific definitions and implications of aerodynamic stabilization.

Contextual Notes

Participants highlight the difficulty in accessing research papers, with some being behind paywalls. There is also a lack of clarity on the specific definitions and types of stability being discussed, which may affect the understanding of aerodynamic stabilization in satellites.

giber
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i need to do a work about aerodynamic stabilization on satelites.. can anyone help

thanks
 
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Try googling "torque equilibrium attitude".
 
i don´t find anything about it... all papers to pay, not even examples of satellites... the only information was that URSS send one (cosmos 149) with gravitational and aerodynamic control.. nothing much...
 
giber,
giber said:
i don´t find anything about it... all papers to pay, not even examples of satellites... the only information was that URSS send one (cosmos 149) with gravitational and aerodynamic control.. nothing much...

What, precisely, do you mean by aerodynamic stabilization of satellites? I would presume you know that there is no air in space, and as such any form of aerodynamic control surfaces (such as used on aircraft) are ineffective. And I think you should also define what specific form of stability you are researching: Spin stability or Orbit stability? Suffice it to say that use of the word "aerodynamic" whenever it comes to space (or anything above about 200,000 feet in altitude) is odd.

Rainman
 
giber said:
i don´t find anything about it... all papers to pay, not even examples of satellites... the only information was that URSS send one (cosmos 149) with gravitational and aerodynamic control.. nothing much...


So bypass the pay sites. This one, for example, is free.
http://www.lerc.nasa.gov/WWW/MMAP/PIMS/MEIT/MEIT_pdfs/meit2002/Section19.pdf"


RainmanAero said:
Suffice it to say that use of the word "aerodynamic" whenever it comes to space (or anything above about 200,000 feet in altitude) is odd.

It is not odd at all. The exoatmosphere extends well beyond low Earth orbit. The Space Station's orbit, for example, decays by a few hundred meters per day due to atmospheric drag.

Approaches used by vehicles in low Earth orbit to address atmospheric drag include
  • Torque equilibrium attitude. Atmospheric drag imparts force and torque on the vehicle. The torque depends on attitude. If the vehicle has a non-spherical mass distribution, the gradient in the gravitation field also exerts a torque on the vehicle. Torque equilibrium attitude is the attitude that results in the smallest net torque on the vehicle from the combined effects of atmospheric drag torque and gravity gradient torque.
  • Minimum drag attitude. This is the attitude that minimizes the drag force on the vehicle.
  • Ah f*** it attitude. The vehicle has some science to perform. It pays the penalty and expends fuel to maintain the altitude and attitude needed to carry out its primary mission.
 
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