Having trouble sleeping so here's a data sci nerd story for you all.
A dynamics tunnel requires more than blow-down designs. And the tunnels are so complex tbat non-rigid models are a no-no. If one breaks...
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So most of the aerospace research is done at Langley's TDT. For an operating cost of about $270,000/hr, iirc.
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A while back, I got a chance to play with some data pulled off a test done there. It was for the F-35 tail empennage.
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The tests cost in the eight figures to run. The resulting dataset was nothing more than an Excel file.
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So when you're complaining about hashtag horribleness with some cloud based database service or something...
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Just remember that the US government dropped $10+ million to acquire some data and then shoved it unorganized into a .xls file.
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To study just one part of a fighter jet. And then they paid another $1.5 million for me to re-analyze the data... to yield the same result.
End of conversation
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please, do go on! I just learned the word “transonic” and I'm fascinated
Like e.g. what does a dynamics tunnel do that's so complicated? -
Dynamics here means non-rigid models, so aeroelastic analysis is possible, e.g. flutter, control surface movement, etc.
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Aeroelasticity is hard, and every aircraft has a flutter limit at which point the loading can break the structure.
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This would be bad in a multi-million dollar tunnel with air moving at 700mph.
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Transonic refers to the range betwern Mach 0.7ish and Mach 1.2ish, depending on structure.
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In transonic flow, air moves at > Mach 1 at some parts of the model, and shockwaves form, but not everywhere
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The transonic range is poorly understood and even our best computational models today perform v poorly.
End of conversation
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