tag:blogger.com,1999:blog-3010470568679468360.post3192741808437843024..comments2023-09-11T20:11:20.341+12:00Comments on Profiles of our future in space: The hanging gardens of spaceAndrew Whttp://www.blogger.com/profile/00249167164554047476noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-3010470568679468360.post-43113866082897741292011-08-29T01:47:15.188+12:002011-08-29T01:47:15.188+12:00Hello Andrew,
I've added some calculations on...Hello Andrew,<br /><br />I've added some calculations on hoop stresses in the habitat wall (Torus 1 calculations on my web site) and they impact significantly on the weight of the habitat. For high yield aluminium 150mm wall are required, for a total weight of about 1 million tons. This is directly proportional to air pressure, so a lower air pressure would reduce the requirements. It would also reduce the weight of the air, which would be good. Do you know how low the pressure can be and remain breathable? I expect a higher oxygen ratio would also allow lower air pressure but make everything a lot more flammable... <br />It might also be possible to use fiber reinforced materials, for higher yield strengths. Any ideas?<br /><br />Regards,<br /><br />Michel LamontagneMichelhttps://www.blogger.com/profile/01405756533437775173noreply@blogger.comtag:blogger.com,1999:blog-3010470568679468360.post-22057392486916260382011-08-24T11:37:17.773+12:002011-08-24T11:37:17.773+12:00Hello Andrew,
100 000 tons seems much too light, ...Hello Andrew,<br /><br />100 000 tons seems much too light, since i calculate the atmosphere alone will weight 57 000 tons!<br /><br />Numbers in the Torus1 calculations spreadsheet on my website.<br />https://sites.google.com/site/bdespace/calculs<br /><br />3 or 4 hundred thousand at least. Lower air density might help, though, or i may have screwed up the math !<br /><br />Regards,<br /><br />Michel LamontagneMichelhttps://www.blogger.com/profile/01405756533437775173noreply@blogger.comtag:blogger.com,1999:blog-3010470568679468360.post-69607535666792900522011-08-13T12:06:14.983+12:002011-08-13T12:06:14.983+12:00Hi, Michel, yep, that's what I'm talking a...Hi, Michel, yep, that's what I'm talking about.<br />What're your thoughts on the mass of such a structure and the population it could support? I'm thinking that a structural mass of less than 100,000 tonnes and total mass less than 200,000 tonnes might be possible, with a population, most of whom would be short staying visitors, of 50,000 people. I know that sounds ridiculously light, but I'm trying to push the boundaries of what's possible.<br /> I'll offer some numbers when I've time.Andrew Whttps://www.blogger.com/profile/00249167164554047476noreply@blogger.comtag:blogger.com,1999:blog-3010470568679468360.post-32967640693738626622011-08-12T00:37:39.516+12:002011-08-12T00:37:39.516+12:00Hello Andrew,
I had trouble visualizing the conce...Hello Andrew,<br /><br />I had trouble visualizing the concept, so I drew it. I’ve uploaded a technical illustration of the Hanging Garden Torus on my web site. A 2 km in diameter,100m cylindrical torus in a sun synchronous orbit. The shadeside mirrors are on a non-rotating section, as are the photocells and the docking port for the orbital shuttles. <br />The different levels are cable supported, perhaps a little wider than what you described in the text. Movement in the torus is by a personal rapid transit system, up to the core by elevators. Energy input to the torus, as well as the night/day cycle is controlled by movable shades located on the inside of the window bays. The support cables incorporate some kind of motion damping system for vibration control. There is little radiation shielding, since the station is in low orbit.<br /><br />Hope you enjoy it, regards,<br /><br />Michel LamontagneMichelhttps://www.blogger.com/profile/01405756533437775173noreply@blogger.comtag:blogger.com,1999:blog-3010470568679468360.post-73299594551925440092011-07-26T16:35:30.181+12:002011-07-26T16:35:30.181+12:00Hi Michel,
I've refined the idea a little...Hi Michel,<br /><br /> I've refined the idea a little after a bit more thought.<br /><br /> Like I said before, you start with a Stanford Torus design and hang the rim structure from tethers (or spokes) under tension, a lot of them. they come down through the roof of the "tube" from the axis and are spread to anchor the floor, occupying a volume the shape of a triangular prism or small "mountain range" that extends around the entire rim from floor to roof. platforms are fixed to these tethers, I think in a random pattern to provide a natural appearance which is then covered with flora to give a natural appearance.<br /><br /> The effect I'm thinking of is for it to look like a steep rock face covered with indentations holding homes.<br /><br /> I was thinking of it being located in a dusk to dawn sun-synchronous LEO and so getting away without needing the thick radiation shield that the deep space Stanford Torus that was originally proposed had.<br /><br /> Then, instead of having all the lighting reflected down vertically into the habitat, just have transparent tinted habitat walls, with a space mirror behind the colony so light is coming in both directly from the sun, and from the anti-sunward direction, as the light comes in at a low angle it'll penetrate deep into the indentations in the "rock" face.<br /> Roads and other transport would be deep inside the "mountain range"<br /><br /> If the diameter of the rim or tube were 100m, and the base of the "mountain range" was 30m across, with the platforms separated by 10m vertically you would have a total area of about 60ha over all the platforms.<br /><br /> I think the whole thing could be incredibly light weight, even with a diameter of 2km.Andrew Whttps://www.blogger.com/profile/00249167164554047476noreply@blogger.comtag:blogger.com,1999:blog-3010470568679468360.post-9198226767147792682011-07-25T10:29:57.987+12:002011-07-25T10:29:57.987+12:00Hello Andrew,
I've added a pair of drawings o...Hello Andrew,<br /><br />I've added a pair of drawings of the inside of a mid size oneil cylinder to my web site. In the Napa valley view, the winery in the middle of the picture is a tensioned structure, directly inspired by this essay. I'm a bit worried about the problem of shadow with larger hanging structures. I'll try to make a version of the Barcelona view with more hanging elements.<br />Comments welcome!<br /><br />Regards,<br /><br />https://sites.google.com/site/bdespace/<br />Michel LamontagneMichelhttps://www.blogger.com/profile/01405756533437775173noreply@blogger.com