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Testing Aircraft - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect segment exploring the process of flight testing. The segment features the Hyper-X and answers questions pertaining to its test stage.

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Okay, we've learned how geometry is important in designing an experimental aircraft. 00:00:00
We've also learned some steps in the aircraft design process, but there's still one more 00:00:09
step to go. 00:00:13
Scott mentioned earlier that the last stage in designing an aircraft is flight testing. 00:00:14
Well, the lead center for flight testing is NASA Dryden Flight Research Center in Edwards, 00:00:19
California. 00:00:25
Let's take a look and see what they're doing with the Hyper-X. 00:00:26
How will the Hyper-X reach its test altitude? 00:00:31
How do the Hyper-X engineers collect their research information? 00:00:34
Why is algebra important in Hyper-X research? 00:00:38
Hi, I'm Lori Marshall. 00:00:42
I'm a research engineer in the aerodynamics branch here at NASA's Dryden Flight Research 00:00:45
Center. 00:00:49
I'm one of the engineers responsible for getting the Hyper-X ready for flight. 00:00:50
In order to do this, we perform tests on the vehicle to ensure that the instrumentation 00:00:55
system will measure the necessary data. 00:01:00
We make sure that the control room is set up properly to record this data during flight. 00:01:03
We also perform inspections of the Hyper-X during assembly and testing to ensure that 00:01:09
the systems are operational and that no damage has occurred. 00:01:13
You see, the Hyper-X is a thermal protection system, similar to the space shuttle. 00:01:16
The exterior is covered with special tiles that allow it to withstand the high temperatures 00:01:21
of high-speed flight. 00:01:26
If any of the tiles were damaged, not only would the vehicle structure be compromised, 00:01:27
but the aerodynamic shape that we've tested during the design process could also be altered, 00:01:32
and this could affect the flight. 00:01:36
How do they flight test the Hyper-X at such high speeds? 00:01:38
Great question! 00:01:42
The Hyper-X is a very small vehicle, about the size of two kayaks side-by-side. 00:01:44
As Scott told you earlier, it will fly at about Mach 10. 00:01:50
Now because of its size, we only have enough fuel for use at the test conditions or when 00:01:54
the Hyper-X reaches Mach 10. 00:01:58
How do you get Hyper-X to reach Mach 10? 00:02:00
The Hyper-X is attached to the nose of a rocket. 00:02:04
The rocket is mounted under the wing of a B-52 jet. 00:02:06
Let me explain what happens. 00:02:10
The B-52 takes the Hyper-X, which is attached to the rocket, up to a preset altitude and 00:02:11
speed, and releases it. 00:02:17
Then the rocket ignites and flies to an altitude of approximately 100,000 feet, traveling to 00:02:19
the test conditions. 00:02:25
Next, the Hyper-X separates from the rocket and the scramjet engine ignites. 00:02:26
This is when the flight test begins. 00:02:32
The Hyper-X generates over 600 measurements that are sent to the control room during the 00:02:34
flight. 00:02:38
These measurements allow the research engineers to determine the success of the flight. 00:02:40
Each engineer can access their data on specially designed displays, which are also recorded 00:02:44
for post-flight analysis. 00:02:49
How do they analyze all these data? 00:02:50
Well, we use several different methods, but algebra is the foundation for all of these. 00:02:53
We use algebra throughout the design, flight testing, and post-flight analysis phases of 00:02:58
the experiment. 00:03:03
The Vehicle Stability and Control System is a good example of how algebra is used during 00:03:05
flight testing. 00:03:09
For example, take a seesaw. 00:03:10
A seesaw consists of a board and a pivot point, or fulcrum. 00:03:11
Suppose we have Norbert on one side of the seesaw and Zot on the other side. 00:03:18
Here, the seesaw is not balanced. 00:03:22
How do you balance the seesaw? 00:03:25
Well, to balance the seesaw, the product of the weight and the horizontal distance on 00:03:28
the left side of the pivot point must equal the product of the weight and the horizontal 00:03:33
distance on the right side of the pivot point. 00:03:37
By moving Norbert on the left side of the pivot point closer in, you can see the seesaw 00:03:40
becomes balanced. 00:03:45
In mathematical terms, the weight of Norbert times his horizontal distance to the pivot 00:03:46
point is equal to the weight of Zot times his horizontal distance to the pivot point. 00:03:51
Now in the case of the HyperX, the flight computer controls the wings and the tails 00:03:57
to keep the vehicle flying and stable throughout the experiment. 00:04:02
Not for these calculations, we wouldn't be able to fly and get the necessary data. 00:04:06
Have you flight tested the HyperX? 00:04:10
As a matter of fact, we did. 00:04:13
Unfortunately, like many experiments, this one didn't go as planned and the HyperX never 00:04:15
made it to the test conditions. 00:04:20
Sometimes when performing experiments, unforeseen events can occur. 00:04:22
However, we were able to receive data from the HyperX before the test was terminated. 00:04:27
We will use this data to successfully flight test the HyperX again and achieve our mission 00:04:33
of testing scramjet technology. 00:04:38
Wow, if the HyperX program is so successful, how will it affect the future of flight? 00:04:41
Well, let's see. 00:04:46
Recently, I flew from NASA Langley in Virginia to NASA Dryden here in California. 00:04:47
It took about five hours. 00:04:52
If the commercial aircraft were using the same technology used on the HyperX, my flight 00:04:54
time would have been reduced to 30 minutes. 00:04:59
If you ever plan to go into space, the same technology would allow for larger cargo capacity 00:05:02
so space travel would cost less. 00:05:08
This technology would also allow for reusable vehicles at a much lower cost. 00:05:10
This means we could see more launches and more exploration of space. 00:05:15
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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:
305
Fecha:
28 de mayo de 2007 - 16:53
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
05′ 20″
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:
32.02 MBytes

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