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Neutral Bouyancy

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Why? Files segment explaining neutral bouyancy and how NASA scientist simulate a weightless environment in a laboratory.

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I never thought a laboratory would have a swimming pool. 00:00:00
Me either. I wonder what they do here. 00:00:03
I'm glad you asked. You two must be the treehouse detectives. 00:00:06
Yes, we are. 00:00:09
Well, my name is Mr. Utley, and this is the Neutral Buoyancy Laboratory, or NBL. 00:00:11
We use this tank to simulate a weightless environment just like you'd see in space. 00:00:15
It sure is big. Just how big is it? 00:00:19
The NBL is 202 feet long, it's 102 feet wide, and 40 feet deep. 00:00:22
That means it holds just over 6.2 million gallons of water. 00:00:27
That's as big as 12 Olympic-sized swimming pools all put together. 00:00:30
Wow, that is big. Why do you need such a big tank? I mean, laboratory. 00:00:34
Well, the International Space Station components are really big, 00:00:40
so we need to have an environment that was big enough to be able to have astronauts practice putting all the components together. 00:00:43
How do the astronauts train in the NBL? 00:00:48
Well, instructors coach the astronauts on tasks and techniques in spacewalks 00:00:50
that they're going to have to do while living and working in orbit. 00:00:55
Spacewalks? Why would they need to walk in space? 00:00:58
Well, sometimes astronauts have to go outside of their space home to do such things as assemble the space station 00:01:01
or even fix the Hubble Space Telescope. 00:01:07
Is there anything else they do in the NBL? 00:01:10
Yes, as a part of spacewalk training, they train on tasks like connecting power supplies, 00:01:12
deploying radiators, deploying solar arrays, or even changing batteries. 00:01:17
Changing batteries? That doesn't sound very hard. 00:01:21
Why do you have to train for such easy jobs? 00:01:24
It may sound easy, but working in space is very challenging. 00:01:27
There is no up or down, and so objects may not be in the same orientation they were in when they were training here in the NBL. 00:01:30
At least all the heavy stuff doesn't weigh as much as it does on Earth. 00:01:37
Well, actually, even though it's weightless in orbit, objects still have their mass, 00:01:40
so you have to be very careful about moving a large object quickly because it will build up momentum, 00:01:44
so astronauts have to train to be able to move things very slowly and deliberately. 00:01:49
This is a lot more complex than we thought. 00:01:53
Why do you use water? 00:01:56
We create a weightless environment by using the principle of neutral buoyancy. 00:01:58
What is neutral buoyancy? 00:02:01
Well, neutral buoyancy is when an object has the same tendency to float as it does to sink, 00:02:03
and that just hovers in the water, and that is the same property as being weightless on orbit. 00:02:09
So you can take a 190-pound astronaut, put them into a 200-pound spacesuit, 00:02:14
pressurize the suit, and add weights to the chest, back, and arms and legs just so that they're hovering around in the water, 00:02:18
and that gives them the same reactive forces that they would have in orbit. 00:02:25
So when you push yourself away from something, your body is going to continue to float away from it. 00:02:28
If the suit weighs 200 pounds, how do you get them out of the pool? 00:02:32
Actually, we're taking the astronauts out of the water right now. 00:02:35
Wow, those suits are awesome. 00:02:39
If you really want to know more about spacesuits, you should talk to Dr. Ross here at Johnson Space Center. 00:02:42
That would be great. 00:02:46
Well, give her a call and let her know you're coming. 00:02:48
Thanks, Mr. Rutley. 00:02:50
Bye. 00:02:51
Bye. 00:02:52
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Idioma/s:
en
Niveles educativos:
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Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
1245
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
18.08 MBytes

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