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Acoustic Stealth Technology Finally Created
smitty777 writes "An idea for acoustic stealth technology proposed in 2008 was finally put into practice. The abstract describes taking advantage of the 'transformation acoustics and linear coordinate transformations that result in shells which are homogeneous, broadband, and compact. The required material parameters are highly anisotropic; however, we show that they are easily achievable in practice in metamaterials made of perforated plastic plates.' It is thought this technology might be useful for shielding ships from sonar or creating soundproof rooms."
This is the first I'm hearing of it.
Caffeine is my anti-drug!
Duranin - A NWN2 Roleplaying Persistent World
The prototheoretical framework conceived by the authors involves the use of a minimization strategy with respect to the dampening properties of metamaterial plates, thus ensuring an optimized rendering of the phlogistonic metavariables in the form of an acoustic suppressing superstructure. The aim of this paper is twofold...
Please for the love of $DEITY make this a reality. Right now low frequencies are impossible to block so it's impossible to soundproof a room against those godamn fucking annoying boomcars.
When will I learn to stop clicking all those stupid links!
P.S. / Hint: I grew up in the 80's, so it's only mildly annoying to click those links.
The big problem with modern stealth planes is that they may be invisible to radar, but they make a distinctive rumbling sound when they fly by. They way they deal with this now is they scientifically pinpoint where the sound is statistically likely to be heard, then they'll place a man on the ground to hold out his hand and say "Sounds like rain!"
"I like to lick butts!" by MobileTatsu-NJG (#32700246) (Score:5, Informative)
I imagine they would induce a lot of drag on the hull
Then again, so would huge holes from torpedoes.
"But this one goes to 11!"
No, the goatse ones are real pain in the ass. ;-)
OK, I apologize for that one.
Lost at C:>. Found at C.
I think Mister Whirly was referring to the torpedo holes the enemy installs in your sub.
They say a little knowledge is a dangerous thing, but it's not one half so bad as a lot of ignorance. - Terry Pratchett
Actually, aerodynamics technology can make a supersonic airplane signature (aka "boom") almost silent - the military and NASA has been investing in that for years.
For instance, from NASA's website:
I know Eurocopter is working on a quiet helicopter, but I couldn't find the one I know about (nor can I talk about it, because they are a customer I'm working with). It may be the same technology as I was able to find, but I'm not sure.
This technology has a different application - it bends sound around the object it surrounds, so sonically it appears to not be there. Being able to bend waves of different kinds around objects has fundamental uses - for instance, if you can bend radiation around a spaceship, you eliminate one of the problems with the theoretical Alcubierre drive (though I would say the theory existed before he wrote about it, as people in my physics class discussed it amongst other "further than light" ideas before 1994 - the two that we couldn't debunk were time bubbles and one that is difficult to describe, but I'd call it uncertainty tunneling).
I put my kid in the refrigerator to solve that question. Unfortunately, he became a schrodinger's cat.
This problem was introduced a few months back, and nobody really seems to care. I guess high-end website features like clicking links are pretty low priority in comparison to important Javascript/AJAX-y features like a notification on the bottom of the screen that perpetually informs us that something is "Working...".