WingedMigrator From United States of America, joined Oct 2005, 2301 posts, RR: 56
Reply 4, posted (4 years 7 months 2 weeks 1 day 6 hours ago) and read 2626 times:
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.
tdscanuck From Canada, joined Jan 2006, 12710 posts, RR: 80
Reply 5, posted (4 years 7 months 2 weeks 1 day 4 hours ago) and read 2607 times:
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.