Nutational damping in satellites

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    Damping Satellites
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Discussion Overview

The discussion revolves around modeling the sloshing of fuel in satellite fuel tanks, particularly focusing on energy dissipation mechanisms and the implications for satellite stability. Participants explore various modeling approaches, including pendulum and mass-spring-damper models, and consider design alternatives to mitigate slosh effects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant seeks assistance in modeling fuel sloshing as an energy sink.
  • Another mentions that NASA has previously modeled this phenomenon using a pendulum model but wishes to include energy dissipation.
  • A typical approach suggested is a mass-spring-damper model, with a reference to a relevant paper discussing a hybrid model.
  • Some participants propose that using a slosh-free tank design, such as a mesh filler, could simplify the issue, though it is noted that such designs do not completely eliminate slosh.
  • It is mentioned that spacecraft designers utilize passive anti-slosh devices, like meshes, but slosh can still occur unless the tank is completely filled with such devices.
  • A participant expresses gratitude for the information shared, acknowledging the complexity of the topic.
  • Another participant inquires about the benefits of using different definitions of damping ratio in their non-dimensional equations, specifically questioning whether to use the total mass of the body or just the mass of the fuel.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best modeling approach or the effectiveness of slosh-free designs, indicating multiple competing views and unresolved questions regarding the optimal damping ratio to use in equations.

Contextual Notes

The discussion highlights the complexity of modeling fuel sloshing and the various factors that influence the effectiveness of different approaches, including the definitions of damping ratios and the design of fuel tanks.

vishal007win
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i want to ask ...how can i model sloshing of fuel in satellite feul tank , to an energy sink model...
can anybody help me?
 
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in one of the experiment NASA has done, they have modeled this to pendulum model...but i want to incorporate energy dissipation to it too
 
Wouldn't it be easier to use a slosh-free tank design, such as a mesh filler?
 
Danger said:
Wouldn't it be easier to use a slosh-free tank design, such as a mesh filler?
A mesh doesn't stop slosh, but it can help attenuate it -- in the right circumstances.

Spacecraft designers do use meshes (isogrids) as one of several passive anti-slosh devices. See http://books.google.com/patents/about?id=cUoHAAAAEBAJ".

Unless the fuel tank is packed jam full with passive anti-slosh devices, there will always be slosh of some sort. Since slosh has resulted in multiple vehicle incidents, it is a very good idea to confirm via analysis and simulation that the passive anti-slosh devices and active slosh controls will work to keep the vehicle under control.

Everything you want to know about slosh: http://sloshcentral.bbbeard.org/.
 
Last edited by a moderator:
Thanks, DH. That was very informative. I never realized how complex the matter is.
 
thanks DH..
i was looking for this only...
but one more thing to ask..
i m working with non-dimensionalzd equations
so wud it be more beneficial to work with damping ratio ς = c/2mω0. where m is the total mass of body...
or damping ratio ς = c/2mω0. where m is the mass of fuel...
hope u r getting what i m tryin to ask...
 

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