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Ice and Aircraft - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment that explains how meteorology, specifically icing, effects the ground operations of aircraft. Explores research being conducted to study the effects of icing by using refrigerated wind tunnels.

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We've already mentioned the many types of meteorological conditions that can affect 00:00:00
aviation operations. 00:00:04
For the remaining portion of this program though, we're going to learn our focus on 00:00:05
one type, icing. 00:00:09
Icing can have a profound effect on both the in-flight and ground operations of aircraft. 00:00:12
Let us visit two NASA research centers that are involved in various icing research studies. 00:00:17
We'll start our icing travels by visiting NASA Lewis Research Center in Cleveland, Ohio 00:00:22
and its Icing Research Tunnel. 00:00:27
Now this facility is the world's largest refrigerated wind tunnel. 00:00:29
So bundle up, let's go visit this giant cooler and have a closer look at icing effects on 00:00:34
aircraft and the icing research being conducted. 00:00:39
Listen to learn how one measures the effects of ice on aircraft performance. 00:00:42
Thanks, Shelley. 00:00:47
My name is Dr. Judy Foss-Vanzanti and I'm standing in the test section of the Icing 00:00:49
Research Tunnel. 00:00:54
Right now it's nice and warm in here, but later on it's going to get really cold. 00:00:55
What this tunnel was built for was to simulate down here on the ground what it's like for 00:01:00
an airplane to fly through an icing cloud up there. 00:01:05
We do this by creating a cloud that mimics what you see up there. 00:01:08
As one of the research engineers, I asked the operators to select five parameters. 00:01:13
One is the airspeed coming past the model. 00:01:18
One is the temperature, how cold it is, always below freezing. 00:01:21
Two parameters are about the cloud density, how much water I have in the cloud, and also 00:01:25
how big each drop size is. 00:01:30
The final parameter I select is the time that I'll be flying through that cloud. 00:01:32
I select the cloud conditions, I select the model, I either select an engine, which provides 00:01:36
the airplane forward thrust, or I select a wing, which provides the plane lift, and I 00:01:41
want to see one of three things. 00:01:46
One is what kind of ice do I grow on my model? 00:01:49
What does it look like for the given cloud condition? 00:01:52
Another thing I might want to look at is how to keep ice from growing on that, an ice 00:01:55
protection system. 00:01:58
And a third thing I might want to look at is to see how well I can predict what the 00:02:00
ice shape is going to look like using a mathematical model and a computer. 00:02:04
All these three functions are done in the tunnel. 00:02:09
I use this tunnel along with Tom Ratfosky for the tailplane icing program. 00:02:11
What we did there was to see how ice contamination affects the operation of the tailplane. 00:02:16
Let's take a look at what the tailplane is and how it affects the aircraft operation. 00:02:21
What we have here is an animation of an airplane in flight. 00:02:27
The forces acting on this airplane are the weight, which acts through the center of gravity, 00:02:31
the upward lift is provided by the wing, and the tailplane on the right side of the screen 00:02:37
provides a downward lift. 00:02:41
In equilibrium flight, we've got the following force and moment balances to consider. 00:02:44
We've got the weight, which acts through the center of gravity, which is also the aircraft's 00:02:49
pivot point. 00:02:53
That's always forward of the wing's center of lift. 00:02:55
Those two forces acting together create a nose-down pitching moment. 00:02:58
The tail comes in to provide a downward lift. 00:03:02
As you can see, that's a simple geometry problem. 00:03:06
The plane acts an awful lot like a seesaw. 00:03:09
The tailplane icing project that Tom and I worked on investigated the question, what 00:03:12
happens if you move that wing's center of lift further back? 00:03:16
How does that affect the tailplane if you've got an ice shape on it? 00:03:19
We at NASA Lewis Research Center took this information and gave it to the pilots so they 00:03:23
can make better and safer operating decisions. 00:03:27
Back to you, Shelley. 00:03:30
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Idioma/s:
en
Materias:
Matemáticas
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:
368
Fecha:
28 de mayo de 2007 - 16:52
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 33″
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:
21.39 MBytes

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