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Russell Croman
Добавлен 27 апр 2008
AI for Astrophotography (2022 AIC Presentation)
By gracious permission from the board of the Advanced Imaging Conference, this is a presentation I did in 2022 introducing convolutional neural networks for astronomical image processing. The main goal is to demystify AI and neural networks and show you how they work.
Check out more great AIC content at www.advancedimagingconference.com. All content online can be accessed by creating a free account.
This video is copyright © 2022 by the Advanced Imaging Conference. It may not be reproduced in whole or in part without prior permission.
Check out more great AIC content at www.advancedimagingconference.com. All content online can be accessed by creating a free account.
This video is copyright © 2022 by the Advanced Imaging Conference. It may not be reproduced in whole or in part without prior permission.
Просмотров: 4 352
Видео
What Machine Learning Looks Like
Просмотров 6093 года назад
This is what training a convolutional neural network to remove the stars from astronomical photographs looks like. Neural networks are amazing, but there is nothing magical or "intelligent" about them. In essence, they are sophisticated mathematical functions that can "learn" to do various tasks through training. It requires an intelligence at the keyboard to define them, coax them through trai...
Shock Wave Formation in Transonic Flight
Просмотров 145 тыс.8 лет назад
Formation of a shock wave above the wing of a Boeing 737. The aircraft itself isn't going supersonic, but it's going fast enough (probably around Mach 0.8) that the local airflow over a portion of the top of the wing is supersonic. This is called "transonic," and results in the formation of a shock wave at a right angle to the surface of the wing. The air in front of the shock is supersonic, an...
Asymmetric Spiral Dive Slow-Mo
Просмотров 9 тыс.10 лет назад
An asymmetric spiral dive is a basic acrobatic maneuver in paragliding. Part of each rotation is spent steepening the dive, and the other part is spent recovering from the dive with opposite brake input and weight shift. Each time the dive is re-entered, the wing can go quite low below the horizon, and the pilot is briefly above the wing, which I find quite exciting. During this time there is e...
Shock Wave Formation in Transonic Flight
Просмотров 634 тыс.11 лет назад
Formation of a shock wave around the engine cowl of a Boeing 767 at high speed. The aircraft itself isn't going supersonic, but it's going fast enough (probably around Mach 0.8) that the local airflow around the engine cowl is supersonic, in a small area. This is called "transonic," and results in the formation of a shock wave at a right angle to the surface of the plane. The air in front of th...
First CTSW Lesson
Просмотров 40 тыс.12 лет назад
A brief clip from my first lesson in my Flight Design CTSW light sport airplane. Good times!
CTSW
Просмотров 5 тыс.12 лет назад
My buddy Kent putting my new Flight Design CTSW through its paces... sweet!
GoPro Hero2 Slow-Mo Test
Просмотров 20912 лет назад
A quick test of the 120fps mode of the new GoPro Hero2...
Lake Travis Powered Paragliding
Просмотров 2,8 тыс.13 лет назад
Super fun evening flying around Lake Travis near Austin, Texas. It's a shame the lake is so low due to the drought, but it's fun having little islands here and there to shoot touch-and-goes on.
Pack Bats
Просмотров 16313 лет назад
Very pleasant evening soaring at Packsaddle, joined at sunset by some of the bats central Texas is famous for!
Awak Airspeed
Просмотров 1,2 тыс.13 лет назад
Some airspeed measurements of the Awak 18 mini-paraglider with Flat Top 120 paramotor.
Big Whacks.m4v
Просмотров 1 тыс.13 лет назад
My first really big whacks on an EN-D glider. Probably the gnarliest air I've ever flown in.
Full Stalls
Просмотров 99813 лет назад
A couple of my first full stalls. Woo hoo! Took me quite some time to work up the nerve to do this (they can go badly). Perfect coaching by Chris Santacroce... thanks! By the end of the weekend (this flight) they were going rather routinely with not too much loss of altitude.
2010-10-10 Bobcat Strong-Wind Soaring
Просмотров 1,5 тыс.13 лет назад
2010-10-10 Bobcat Strong-Wind Soaring
38:00 Extremely important point -- the neural network is NOT a model of conscious thought or even explicit knowledge representation. It's patterns of numbers. I wish more people realized this.
Thanks very much for starting with the broad definition of AI! I spend far too much time trying to convince people that my career hasn't been ChatGPT :)
I've seen them on the wing of a 747. The wave is a little weird to watch, they shift forward or backward fairly slowly. Until you realize just how fast that wing is moving forward,
Been watching cgi animations, but here is the math in the flesh . . . in the obvious line dancing on cord. SCIENCE!!!!!!🤓
That’s just the sun reflecting on the wing
Cool....
transonic pressure wave like this causes poseidal resonance within the engine clear to see in the video
What planet do you live on mate? That’s a Subsonic Wing of a B737. They cruise at around .74-.78. Mach. There’s absolutely no way is there going to be any form of shockwave at those slow speeds!! You need to be up around .99 for that to start!!!
Before you start attacking people, check if you are actually correct because I can tell you, that you are wrong in this case. You have become a victim of the Dunning-Kruger effect, so please be humble because it is embarrassing to throw around falsehoods. First of all, I would recommend you to search up "transsonic flight". There is I believe even a neat wikipedia page which explains what it is. So basically, we have an airliner cruising at around M 0.8, some a bit faster, some a bit slower. They cruise within the transsonic flight regime. What does transsonic mean? A wing has a high-pressure zone underneath and a low-pressure zone above. Airflow is not static, it is highly variable around aerodynamic surfaces. As air gets into the low-pressure zone, it accelerates to supersonic speeds causing the boundary layer above the wing to break off creating turbulent air and making the wing buffer due to those turbulences. This is the reason why airliners of today have supercritical wings and swept wings. It is because they want to increase the speed at which this phenomena happens (called critical Mach number) and decrease drag from flying inside that transsonic flight regime. Having a chaotic boundary layer going into supersonic speeds and creating turbulence is very draggy. Those wings are a tradeoff because such a wing also needs a good Lift-to-Drag ratio. The Convair 990 was a plane built to fly especially fast inside that transsonic regime. They had such a problem witv supersonic airflow that they had to install huge pods on their wings to keep the airflow attached and reduce drag. May be that you have heard of WW2 planes getting out of control when picking up speed and diving down. That was because they had straight wings and upon approaching transsonic flight, the wing couldn't handle supersonic airflow at all which caused high-speed stalls and planes tumbling out of control.
Sorry but those aren't shockwaves. You can also observe this at the wingtips or flap edges during landing. Those are simply "transparent" air vortices.
I'm sorry, but they are in fact normal shock waves. Modern Airliners have swept wings because they are transonic airplanes, designed to be flown at high Mach # where local flow is in fact at mach 1 due to the acceleration of the flow around the wing and fuselage. These shocks are visible when the sun is high overhead and the change in density refracts the incident light. I was first informed about this visible phenomena in my introduction to aerodynamics course at Cornell University, taught by William Sears, who incidentally was the Chief Aerodynamicist at Northrop during the heady days of the XB-35 and the XB-49 flying wings. Great guy, Great teacher. Vortices are another set of visible flow phenomena, but completely different.
44 seconds completed wasted watching that
Nice catch! I've spotted this myself.
👍🏻
Where am I supposed to be looking at?
Cant see it. Its air.
Its soo cool
We not only serve peanuts.....We also bend light with air.....yeah we're pretty cool.....now put your F%&KIN tray table up you peasant 😂😅😂😅
Nonsens There are no shockwaves and a 767 can not flight transsonic
shocking
was soll der Scheiß ???
Also,I do not believe that "trans sonic" flight is within the 767's flight parameters. That is unless it's in a Steep dive right before the wings rip off.
Yep.That thar's a wave thingy alrighty. Funny how air can destort light. I thought only gravity could do that.
awesome video, great to actually see a shockwave! there are not much of these on youtube, fortunately I found this one :)
Very fuel consuming at the air speed.
Dang!! I blinked and missed it!! 😂
"these graphics are so fake, look there's a glitch above the engine cowling right now"
Would a passenger jet like this begin to function normally again if it was mach 1.1 or more so the shock wave isn't occurring over the ailerons/elevators
That is so cool!
That's bloody awesome
At least somebody studied hard. Thank you comment nation
I always know I am close to home when I see the Red River.
The prevatanater frop coalinator was designed to prevent this, but as you can see the overwhelming friction from the air hyperblurrifies and surrounds 3.7° photoneutems.
Saw this on a first generation 747. Local airspeed over some surfaces can be much faster than indicated airspeed.
Pretty cool to think that if you manipulate geometry and air in a certain configuration you can make a lense or distortion with the light passing through.
That’s something funny in the glass.
I never had a window clean enough to observe that...
Shocking! Absolutely shocking!
this blows my mind
Wow
Low throttle but still high Mach in the early descent, lots of spillage. The nacelle will shock free in the cruise…
I think it’s a normal effect that at some points of surfaces of wings, fuselage ect. some local airflow is faster than speed of sound even if the hole plane is slower what we definitely have here with an subsonic flyin’ 767.
I disagree with the "Transonic" speed assumption by the plane. You are seeing the induction of turbine engine and it[the turbine] attaining a "Transonic" wave induction.
Yes I can. Thanks
I get transonic flow when I shake out my rug.
Had to watch the video a couple of times ... but finally saw it ! Fantastic !!
Wow, thanks for sharing, very interesting.
Observing this in a wind tunnel is how they tune wings or airfoils on planes and race cars…..
Wow! Thank you for this. I will look for this and point this out. I've only ever seen that in photographs. So cool thanks.
dont see it
why it distorts light?
Below 10k feet you cannot exceed 250 knots in controlled airspace. At 10k feet mach 1 is around 700 knots. There is no way there is laminar flow even approaching mach 1 on any surface of this aircraft. The phenomenon you are seeing here is more akin to hot air rising off a hot surface in the distance.