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Dispatched
Joined: 08 May 2004
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 Posted: Tue Aug 02, 2005 6:07 am Post subject: |
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Good response.
I apologise, I think the point I'm trying to get across is clouded by my poor knowledge of physics. So I'll turn to the internet to try and explain better...
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| Experiments with human subjects in centrifuges and rotating rooms have confirmed this. When subjects turn their heads about any axis that is not aligned with the rotation of the environment, they experience vestibular illusions of rotation about a perpendicular axis. The illusions are approximately proportional in magnitude and direction to the vector product of the angular velocities of the environment and the head [23, 24]. The resulting mismatch between the vestibular and visual senses of motion are believed to be a major cause of motion sickness [4, 5]. To minimize these illusions while permitting the normal range of human motion, the angular velocity of the environment should be kept low. |
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In 1960, Clark and Hardy noted that "normal" head rotations may occur at up to 5 sec-1 (that is, 5 radians per second). They performed centrifuge studies and observed that the rotational cross-coupling thresholds were 0.06 sec-2 for vestibular illusions and 0.6 sec-2 for nausea. They proposed to stay completely below the threshold of illusions and concluded that the station rotation should not exceed about 0.01 sec-1 (that is, the 0.06 sec-2 threshold for illusions divided by the 5 sec-1 head rotation). At 0.01 radians per second, a 1-g station would need a radius of 98,000 meters [23].
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In 1973, Stone assumed "normal" head rotations of only 3 sec-1 (rather than 5) and acceptable cross-coupling up to 2 sec-2 (more than three times the nausea threshold predicted by Clark and Hardy), giving a maximum station rotation of 0.67 sec-1. This is 67 times the maximum rate proposed by Clark and Hardy and brings the radius of a 1-g station down to only 22 meters [28].
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http://www.spacefuture.com/archive/artificial_gravity_and_the_architecture_of_orbital_habitats.shtml
A 22 meter radius is a lot smaller than I initially thought so I guess it's do-able for sure.
I still disagree that NASA would go for expensive solutions over cheap solutions in their endeavour to get to Mars(Agree to disagree?). I would think using any way possible to get to Mars to unleash a potential gold mine would more than make up for any possible budget cuts which might result. I'd suggest that if NASA got to Mars easily and cheaply then the givernment would sink more into them to get the full benefits Mars may have to offer. Having said that, I agree that a large government paid organisation, such as NASA, is the poster child for inefficiency.
I also agree that the private sector needs to get some serious financial incentives so that they too can challenge to be the first to Mars.
6 months in a small tin can, knowing that there is no backup, no rescue should something go wrong, knowing that something totally out of your control could kill you at any time. I don't think that anything on Earth can truely compare to that situation. |
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matesol
Joined: 23 Jan 2003
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| Posted: Tue Aug 02, 2005 6:15 am Post subject: |
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| Dispatched wrote: |
6 months in a small tin can, knowing that there is no backup, no rescue should something go wrong, knowing that something totally out of your control could kill you at any time. I don't think that anything on Earth can truely compare to that situation. |
Well, how much worse could it be than driving in Korea? Okay, agree to disagree. I think there are people willing would take the risk though. If I weren't married, I think I would be willing to take the risk and I haven't spent years of my studying science everyday, dedicating my life to it every waking moment of my life. Just my $0.02.
Enjoy the book. It IS fascinating and I think I'll see a mission to Mars in my life time, although I may be old by the time it happens. That and the downfall of North Korea will be interesting events.  |
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