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Stealth Is Echo Control Stealth does not mean the aircraft stops scattering radar. It means the shape tries to keep the strongest echo from going back to the radar that sent it. Of course theres the issue of absorbing material as well. Here a pulsed radar wave hits the... show more

Mathelirium

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16,685 просмотров • 3 месяцев назад •via X (Twitter)

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The B-2 Spirit in action! This giant of stealth technology is capable of penetrating enemy defenses without being detected by radar. Note the detail of the landing gear and the incredible engineering of this aircraft. 📹: cupula_3.0

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🇺🇸 The F-22 is the stealth king of fighter jets, but why does it have 2 thrust-vectoring nozzles instead of 3 like Russia’s Su-57? Because 3 nozzles require a round exhaust, and round shapes reflect radar straight back, making the jet easier to detect. The F-22 uses 2 flat, rectangular exhausts, which scatter radar waves away and help keep the jet stealthy. The trade-off: a bit less extreme maneuverability, but far better stealth, which is why it’s still one of the most advanced fighters in the sky. Source: Aviation Insider

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maurer8photography

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In 1996, James Sethian showed something almost unfair...you can find shortest routes through a messy world by letting a wave expand once...no trial paths, no search beams, just one growing front. Here’s how: we solve for an arrival-time field T(x,y) so that T literally means how long the wave needs to reach this point. The rule is ||∇ T|| = 1/F, where the medium is fast (F large) the front sprints, where it’s slow it trudges, and obstacles are speed ≈ 0, so the front wraps around them because that’s the only way forward. Then comes the satisfying part: once T exists, a path doesn’t need to search at all...drop a bead anywhere and let it follow ẋ ∝ -∇ T, it slides downhill on the time landscape and traces a globally fastest route back to the source. This “wave = optimal control” viewpoint is exactly what Tsitsiklis (1995) made precise from the Hamilton-Jacobi side...compute the value/arrival-time function and the optimal trajectories fall out from it. #FastMarching #EikonalEquation

In 1996, James Sethian showed something almost unfair...you can find shortest routes through a messy world by letting a wave expand once...no trial paths, no search beams, just one growing front. Here’s how: we solve for an arrival-time field T(x,y) so that T literally means how long the wave needs to reach this point. The rule is ||∇ T|| = 1/F, where the medium is fast (F large) the front sprints, where it’s slow it trudges, and obstacles are speed ≈ 0, so the front wraps around them because that’s the only way forward. Then comes the satisfying part: once T exists, a path doesn’t need to search at all...drop a bead anywhere and let it follow ẋ ∝ -∇ T, it slides downhill on the time landscape and traces a globally fastest route back to the source. This “wave = optimal control” viewpoint is exactly what Tsitsiklis (1995) made precise from the Hamilton-Jacobi side...compute the value/arrival-time function and the optimal trajectories fall out from it. #FastMarching #EikonalEquation

Mathelirium

766,230 просмотров • 8 месяцев назад