# Nutational damping in satellites

1. Jul 2, 2009

### vishal007win

i want to ask ....how can i model sloshing of fuel in satellite feul tank , to an energy sink model....
can anybody help me?

2. Jul 2, 2009

### vishal007win

in one of the experiment NASA has done, they have modelled this to pendulum model....but i want to incorporate energy dissipation to it too

3. Jul 3, 2009

### D H

Staff Emeritus
4. Jul 3, 2009

### Danger

Wouldn't it be easier to use a slosh-free tank design, such as a mesh filler?

5. Jul 3, 2009

### D H

Staff Emeritus
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: Apr 24, 2017
6. Jul 3, 2009

### Danger

Thanks, DH. That was very informative. I never realized how complex the matter is.

7. Jul 5, 2009

### vishal007win

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....