The article is pretty light on specifics, but interesting.http://www.popsci.com/why-lockheed-martin-is-blasting-orion-crew-capsule-with-noise-from-1500-speakers
From my days in military avionics, I remember strapping things to 20" voice coils and various other things to test them. There was even a place in SoCal that would load a plucked chicken into a howitzer and fire it at a test unit.
I think jet engine manufacturers still do something similar to simulate bird strikes - not sure it's an actual howitzer for them though.
Turns out it's actually quite difficult to make 30hz at 145+Db. 😀
It depends at what distance the measurement is made at.But it is actually not all that hard.
But are those organic, free-range chickens?
I have a blurry memory of Tom Danley chiming in on a thread on the old LAB talking about his work with NASA back in the day. The thread was originally about what was the most powerful amplifier ever. There was a lot of talk about Crest 10001s and the like and then Tom talked about the amp they built back in the early days of the US space programme.There had been a lot of launch failures in the early days, so a team was put together to reproduce the SPL at launch and see if that would shed any light on the problem.The team did manage to build a transducer which achieved the target and they discovered why the launches were failing. IIRC the spectrum had, as well as a heap of low end, a spiky HF element at 8k(?). When these higher frequencies were introduced to the test signal at the appropriate SPLs, a bunch of machine screws unscrewed themselves. Problem identified.It was a very interesting read. I've tried a search of the Archives but couldn't find the original thread.Cheers,Andy
So once again,like the "brown note" in Mythbusters, the subs are arranged in a circle.I'm sure it's loud but would a wall of them all stacked together not create an even better low freq source?Either way, would not want to be in that capsule...if you dare
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