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N14AZ
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New Markings On A 380 Prototype – What For?

Sat Aug 14, 2010 12:03 pm

When watching some pictures taken on August 11 in TLS I noticed that the A 380-prototype MSN 001 has now some new markings on the tail section and on the forward section:
http://www.aviation-friends-hamburg-forum.de/showthread.php?tid=2593
http://i38.servimg.com/u/f38/11/58/51/09/406511.jpg

Picture of MSN 001 without these markings:

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Photo © Krzysztof Skowronski



Does anybody know the purpose of these new markings?
Is it for the A 380-programme or maybe even for the A 350-programme?

Thanks for your help in advance.
N14AZ
 
474218
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RE: New Markings On A 380 Prototype – What For?

Sat Aug 14, 2010 1:23 pm

They appear to be strain (stress) gages. If you look closely they are all over the fuselage . The dots are the gage and the lines are tape the cover (contain) the wires.
 
WingedMigrator
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RE: New Markings On A 380 Prototype – What For?

Sat Aug 14, 2010 10:56 pm

Quoting N14AZ (Thread starter):
Does anybody know the purpose of these new markings?

Could they be sound pressure transducers (microphones) ?

[edit: looking at it more closely, it's probably a phased array of microphones to precisely map the 3-D sound field coming off the engines, wings, etc. That's my theory.]

Quoting 474218 (Reply 1):
They appear to be strain (stress) gages.

If so, placing them indiscriminately on doors and the belly fairing would be quite odd.

[Edited 2010-08-14 16:03:25]
 
474218
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RE: New Markings On A 380 Prototype – What For?

Sat Aug 14, 2010 11:18 pm

Quoting WingedMigrator (Reply 2):

If so, placing them indiscriminately on doors and the belly fairing would be quite odd.

Whatever they are they have "not been placed indiscriminately". There is definite pattern to them.

Quoting WingedMigrator (Reply 2):
Could they be sound pressure transducers (microphones) ?

You could be right. Maybe Airbus wants to remove some insulation batting to save weight and is checking the difference between the interior and exterior readings?

However, the acoustic tests I was involved with concerned the readings inside the cabin. Exterior readings were picked up on ground stations, not on the fuselage skin?
 
WingedMigrator
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RE: New Markings On A 380 Prototype – What For?

Sun Aug 15, 2010 4:27 am

Quoting 474218 (Reply 3):
Whatever they are they have "not been placed indiscriminately"

Sorry, poor choice of words on my part. I meant that rows of similar sensors were spanning across primary structure and other areas, which to me indicated that they weren't about measuring loads.

Quoting 474218 (Reply 3):
Maybe Airbus wants to remove some insulation batting to save weight and is checking the difference between the interior and exterior readings?

That's an excellent theory, since the A380 is always described as being very quiet on the inside. If it's too quiet, it must be carrying around too much insulation, and there must be a way to squeeze out a few kilos and a few dollars. Where and how much to remove might be revealed by these sensor arrays.

Another theory: aero clean-up... a phased array could build a 3-D image of sound sources, and identify where noise is being generated by the wing, flaps, landing gear, etc.?

Another clue: I've seen the same sensors on the A346 in house colors.


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Photo © T.Laurent

 
tdscanuck
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RE: New Markings On A 380 Prototype – What For?

Sun Aug 15, 2010 5:44 am

Quoting 474218 (Reply 3):
However, the acoustic tests I was involved with concerned the readings inside the cabin. Exterior readings were picked up on ground stations, not on the fuselage skin?

There are a bunch of flavours of noise survey...interior noise is usually done with interior microphones, and community noise is done with ground arrays. But sonic level surveys (important for sonic-fatigue parts) and engine shockcell testing uses arrays of fuselage-mounted pressure transducers that look an awful lot like what this A380 is sporting.

Tom.

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