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Models and Testing

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment exploring the engineering design process involving models and how models are tested.

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I'm here at the NASA Langley Research Center's model shop to look into the design process 00:00:00
involving models. 00:00:06
Hello, RJ. 00:00:07
I read your friend's email, so I understand you want to learn more about making a model. 00:00:08
Yes. 00:00:14
Now, we're doing an assignment on transportation and what it would look like in 100 years. 00:00:15
Now, I understand that in the engineering design process that making a model is very 00:00:19
important. 00:00:23
I'm not exactly sure why. 00:00:24
Okay. 00:00:26
Say if you want to test your own design. 00:00:27
Would it be a good idea to just go and build it? 00:00:29
Probably not, because it would cost too much, and you don't even know if it will work. 00:00:32
Exactly. 00:00:36
What if your plane or car doesn't work properly? 00:00:37
Then you will also risk losing a human life during the testing phase. 00:00:40
Wow. 00:00:44
I didn't think of that. 00:00:45
But why are the models so small? 00:00:47
When we build model airplanes, the engineer determines what scale is needed. 00:00:49
What is scale? 00:00:53
Scale is the ratio or measure between the size of the model and the full-size version. 00:00:54
For an example, take a look at this F-18 model. 00:00:58
The scale is 5%, which simply means it's 1 20th of the full-size airplane. 00:01:02
So if an airplane is 10 meters long and I want to build a model about 1 10th in size, 00:01:07
then the model would be about 1 meter for a scale of 1 to 10. 00:01:12
Very good. 00:01:15
What scales are normally used when building models? 00:01:16
Well, one rule of thumb to follow is that the smaller the scale, the less expensive 00:01:18
it is to build and the easier it is to modify. 00:01:23
However, the size varies depending on the design and how the model is tested in the 00:01:25
various wind tunnels. 00:01:30
Aren't all wind tunnels the same? 00:01:31
Not at all. 00:01:33
We have 38 wind tunnels, and they vary in size, and they test different functions. 00:01:34
Some tunnels are large enough to test a small airplane, while others are only a few centimeters 00:01:39
in size. 00:01:43
Why does NASA build airplane models? 00:01:45
Here at NASA Langley, we conduct research on model airplanes in order to make them safer, 00:01:46
quieter, energy efficient, and more environmentally friendly. 00:01:52
We also want to find ways to make them less expensive to build and maintain. 00:01:56
Using models make this research easier and less costly. 00:02:01
Wow, that model over there looks really cool. 00:02:04
It's called the Blender Wayne Body, BWB for short. 00:02:08
It's a futuristic airplane with a unique shape that would cause the entire plane to generate 00:02:11
lift and minimize drag. 00:02:15
We learned about lift and drag in the case of the Challenging Flight. 00:02:17
They are two of the four forces of flight. 00:02:19
If you want to learn more about flight, check out the NASA Eiffel's website. 00:02:22
Very good. 00:02:26
And the design of this airplane is more efficient and will consume 20% less fuel while cruising 00:02:27
at high subsonic speeds. 00:02:32
Wow. 00:02:34
It looks like the wingspan on this is about 88 centimeters, or .88 meters, on a scale 00:02:35
of 1 to 100. 00:02:41
So the full-size version is going to be 88 meters across. 00:02:43
That's one huge plane. 00:02:47
It will be slightly less than the length of a football field. 00:02:49
It's being developed to carry 800 passengers, but recent studies have focused on vehicles 00:02:52
in the 450 passenger class. 00:02:56
This model here is expected to fly in the year 2020. 00:02:59
2020? 00:03:02
Let me see, I'll be about 29 years old. 00:03:03
And I'll be...never mind. 00:03:08
Thanks Mr. James. 00:03:11
I never knew models could be so useful. 00:03:12
You're welcome. 00:03:15
And I wish you good luck on your assignment. 00:03:16
All right, bye. 00:03:17
Bye-bye. 00:03:18
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Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
224
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 19″
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:
20.11 MBytes

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