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Netherlands Audio Speakers: Loud Enough to be heard in Space

retroworks (652802) writes | about 6 months ago

2

retroworks (652802) writes "Located in Noordwijk, Netherlands, and part of ESA's ESTEDC Test Center, is the Large European Acoustic Facility (LEAF). I09, Gizmodo Australia, and The Mail Online run stories about the awesome power of sound amplification system "powerful enough to kill a human being".

LEAF is capable of generating more than 154 decibels, the sound equivalent to standing next to several jets taking off. It is used to blast satellites and spacecraft with sound. Large horns are housed in a sound-proofed room that is 16.4metres tall. One wall of horns stands 11 m wide by 9 m deep and 16.4 m high. The nitrogen that's shot through the horns can produce a range of noise up to more than 154 decibels.

LEAF requires all the doors to be closed, operating in steel-reinforced concrete walls to contain the noise. The walls are coated with an epoxy resin to reflect noise, producing a uniform sound field within the chamber. The article doesn't say whether the knobs go past 11."

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Nothing to do with... (1)

dpilot (134227) | about 6 months ago | (#46134601)

..."loud enough to hear in space" - that's silly, with near-vacuum.

The setup is for simulating the "sound" of liftoff and early atmospheric flight. There was serious concern about the sound level of the engines shaking the rocket apart at liftoff, which is part of why there's the flood of water. Even though the water is loud, it helps dampen the sound of the rocket exhaust. Then there's the "sound" of flying through the air, to the point that they have to throttle the engines back for a portion of the flight - because of "dynamic pressure." The Challenger disaster happened right after this inteval - the last normall communication was, "go for throttle-up", meaning that they were high enough for the dynamic pressure to have dropped enough that they could put the pedal to the metal, again.

Best sound balance (1)

Okian Warrior (537106) | about 6 months ago | (#46135677)

Researchers further note that the best sound balance is usually to be heard from within large concrete bunkers some thirty-seven miles from the installation.

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