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."

Comments

Odd...

[Kirin Fenrir]

This is the first I'm hearing of it.

Um... what?

[Anonymous Coward]

'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.'

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...

Summary of the Article...

[MobileTatsu-NJG]

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!"

Re:submarine use?

[Abstrackt]

I think Mister Whirly was referring to the torpedo holes the enemy installs in your sub.