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Non-rotating Airlock
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Gourdhead
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PostPosted: Wed Jan 17, 2007 8:59 am 
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So if you have a radius of 100 m and the averaged normal force between the 2 rotating sections is 100 N and the coefficient of friction is 0.3, then the apparatus would dissipate 18 840 J per rotation.
What did you use for N? In an interplanetary vehicle I would expect the value of N to approach zero (free fall environment) and the coefficient of dynamic friction, when the best lubricants are used, to be nearer 0.003. When the vehicle is being accelerated by the thrust engines, thrust bearings will be required for the centrifuge and N will be proportional to the thrust force (from f = ma; where m is the mass of the centrifuge).
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scienceguy
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PostPosted: Wed Jan 17, 2007 8:38 pm 
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I used 100 N for N. You probably can estimate this better than me, Guordhead. I didn't know you could get a coefficient of friction of 0.003 for a rotating mechanism.
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Gourdhead
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PostPosted: Thu Jan 18, 2007 9:12 am 
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I didn't know you could get a coefficient of friction of 0.003 for a rotating mechanism.
I don't know it either; I was guessing. 100 newtons seems like a reasonable guess.
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AjaxWoji
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PostPosted: Wed Mar 14, 2007 9:57 pm 
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I looked at everyone elses solutions, and they look really good, but here is another. The red sections and blue sections should be able to spin at the joint, where presumably there would be a bearing and a seal as indicated in the picture. A Spherical bell would surround that joint, and would have seals also.

At 760 Torr, the red and blue sections will experience Viscous gas flow. At considerably less than 100 Millitorr, the green section that is a spherical shell that surrounds the bearing and seal joint for the red and blue sections will experence Molecular flow. As long as a the seal at the joint between the red and blue sections is not leaky, and as long as a small vacuum pump can keep pulling the small amount of leakage back into the red and blue sections, very very little gas will leak out of the green section into the higher Vacuum of the space environment. With Molecular flow, the molecules do not push each other towards the opening (Seal). Instead, for a molecule to get out of the green section into the space environment, it has to bounce towards the seal, and somehow find it's way through it.

Supposing it was maintained well, and a small amount of replacement gas were provided periodically, it would work ok. It's not perfect, but workable.
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MirariNefas
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PostPosted: Thu Mar 15, 2007 11:35 pm 
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and as long as a small vacuum pump can keep pulling the small amount of leakage back into the red and blue sections,


I'm pretty sure that gas can't be corralled with a vacuum pump under molecular flow conditions.

On the other hand, there may be other ways of capturing this leakage. Perhaps the green chamber could have a material which reversibly reacts with the compounds which might leak into it. After a long while it becomes saturated, and then that material would be cycled along to a reprocessing plant where conditions are right for it to release the bound molecules.

It would be like those little packs that come with dried foods which absorb moisture, except we'd periodically take the pack back to a little area where the moisture is boiled out and reused. The chamber would be kept "dry" of oxygen and nitrogen, while preventing them from escaping to the outside void.

I think I'm liking this system overall. It's an active system which will require input and maintenance, which is bad, but the effort should be small enough that it isn't much burden to a large space colony.
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AjaxWoji
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PostPosted: Sat Mar 17, 2007 1:16 am 
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My idea of a most useful habitat. Simple diagram. Three rotating spheres (Red). Each sphere inside a stationary sphere. The space between the spheres (Green) evacuated with roughing pumps to reduce air friction. The coatings of all surfaces of the green spaces teflon or the equivalent, so in the case of disastor where surfaces rub accumulative can be reduced. All stationary spheres are anchored to the cylinder in which they reside.
The three do not have to rotate in the same directions. One should generate Earth simulated gravitation. The others can be set to the simulation desired. If it costs X$ to make one sphere, then the other two should be built for a lesser cost per sphere, since the techniques and equipment would have already have been worked out. Food production can be anywhere, but inside the spheres, it will have to be under artificial lighting. Seals around different twisting junctions should keep the leakage into the green areas to a minimum. Access between each presurized section should be possible without stopping rotation. Extensive experiments could be carried out before actually trying to settle people on the Moon and Mars and other places and expecting them to live a lifetime and raise a family in those gravitational environments. Also, visitors from such planets could reside in such habitats at each world. A leak to the green evacuated areas from a pressurized area should not result in life threating conditions in that depressurizing area. However a big leak might damage the bearings of the spinning spheres. In such a situation, I would suppose the spheres would be allowed to cease rotation.

The whole thing would be expensive, but useful and rather safe.
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Fridamimi
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PostPosted: Mon Nov 07, 2016 5:13 am 
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Bettymaf
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PostPosted: Tue Nov 08, 2016 9:35 am 
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What are some of the tactics pregnant women can use to share the pregnancy experience with non biological family?
What are some of the names/titles used and is there anything that can be done to make it a more integrated experience?

Natja



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B76otDP
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PostPosted: Tue Nov 22, 2016 12:28 am 
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Hi amy, i just pm a moderator on there and explained everything.
Couldnt contact the mod i wanted, just have to wait and see what responce i get now?. hopefully a good one.
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