Venting analysis on satellite payload/electronic box
Venting analysis on satellite payload/electronic box
(OP)
Hello everyone,
I have to do a venting analysis on an electronic box that will go into space. My question is if anyone has ever performed such an analysis and can give me some guidelines? I am wondering if there are any formulas that I can use and check the dimensions of the venting holes. I would not like to do any flow simulation and looking for some quick analytical solutions to this problem. Does anyone have any recommendation on how to do this or any handbooks/standards that I can use, NASA or ECSS?\
Thanks.
I have to do a venting analysis on an electronic box that will go into space. My question is if anyone has ever performed such an analysis and can give me some guidelines? I am wondering if there are any formulas that I can use and check the dimensions of the venting holes. I would not like to do any flow simulation and looking for some quick analytical solutions to this problem. Does anyone have any recommendation on how to do this or any handbooks/standards that I can use, NASA or ECSS?\
Thanks.
RE: Venting analysis on satellite payload/electronic box
TTFN (ta ta for now)
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RE: Venting analysis on satellite payload/electronic box
RE: Venting analysis on satellite payload/electronic box
RE: Venting analysis on satellite payload/electronic box
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Venting analysis on satellite payload/electronic box
There are FEA tools for doing this ... decompression analysis.
On the face of it it seems a "pointless" anlaysis ... the question should be easily with a picture and an opinion "how can this thing support internal pressure ?"
There is a minor technical question about air currents as the payload compartment adjusts to outside pressure. I'd've thought this was more a question for the payload compartment, where your involvement would be to provide a model of your payload component then they run the fully assembled payload compartment.
There's a way to punt the question back ... what is the pressure profile (over time) in the payload compartment ?
Possibly you could show that your box cannot support even a small pressure difference, like 0.1psi, with the surrounding compartment ?
But I think the real question is, again from the payload compartment, what loads does your box experience as the rocket climbs (and depressurises) ? The payload compartment is depressurising, not your box. This will create loads on your box, probably peanuts, but this is a box that needs ticking.
It would be interesting to get a previous analysis report covering this requirement.
another day in paradise, or is paradise one day closer ?
RE: Venting analysis on satellite payload/electronic box
TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg
FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm
RE: Venting analysis on satellite payload/electronic box
I think I will do a static pressure analysis on the box based on maximum depressurization rate (considering that value times a safety factor, the pressure difference between inside and outside of the box at a certain point in time), this should tell me if the box will withstand the pressure drop. For the venting I will calculate to see if there is any possibility of the flow being obstructed/chocked, based on A. Mironer, "Venting of Space Shuttle Payloads)", article.
RE: Venting analysis on satellite payload/electronic box
yeah, I get what you're trying to show, but I still think a picture of your "leaky" box should be enough.
I'd love to see a previous report. How do you even set up this analysis ? I know something of decompression analysis, a pressurised fuselage venting into a lower pressure volume. I looked at your link quickly ... section 3.2.8 seems applicable ? But that "only" says pressure in the payload volume over time. If the pressure falls by 0.1bar in 5 seconds, what does that mean to your "leaky" box ??
and IR ... I'm using "box" in it's non-shape specific sense ... I could've said "widget".
another day in paradise, or is paradise one day closer ?
RE: Venting analysis on satellite payload/electronic box
another day in paradise, or is paradise one day closer ?
RE: Venting analysis on satellite payload/electronic box
I would suspect that micro vent holes... covered/backed by metallic foams to bleed-off EE energy to the metal body structure... could be built into satellite base-mounts that would vent most/all of interior gasses during launch. Then this system of metallic foams and micro-holes would prevent any arcing/static/corona from entering the satellite body... much like fuel vent flash/explosion suppression grids do. AND this would also allow predictable long-term venting of ANY gasses/ions on a discreetly-aligned 'thrust' orientation.
Regards, Wil Taylor
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RE: Venting analysis on satellite payload/electronic box