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Acoustic levitation: how sound can get physical
http://x404.co.uk/forum/viewtopic.php?f=3&t=20991		 Page 1 of 1
Author:  paulzolo [ Wed Jan 08, 2014 2:22 pm ]
Post subject:  Acoustic levitation: how sound can get physical
Quote:
Imagine how much easier life would be if it was possible to levitate objects. Maglev trains, for example, use powerful magnets to repel the carriages and remove the friction of the train on the tracks.
But magnets are just one way of achieving this – and they require the object to have a repelling magnetic force. Now scientists in Japan have shown that a similar effect can be achieved with sound.

http://www.telegraph.co.uk/news/good-to ... sical.html
There’s a video which is rather impressive.
Author:  l3v1ck [ Wed Jan 08, 2014 2:33 pm ]
Post subject:  Re: Acoustic levitation: how sound can get physical
When I read the headline I instantly thought of this
Image
Image
Author:  Spreadie [ Wed Jan 08, 2014 2:54 pm ]
Post subject:  Re: Acoustic levitation: how sound can get physical
l3v1ck wrote:
When I read the headline I instantly thought of this
<snip>

LOL, so did I.

It is fascinating though - it'll be interesting to see how that tech develops.
Author:  Amnesia10 [ Wed Jan 08, 2014 4:40 pm ]
Post subject:  Re: Acoustic levitation: how sound can get physical
So are we expecting trains made of corn starch? Non Newtonian Fluids.

http://www.youtube.com/watch?v=f2XQ97XHjVw
Author:  l3v1ck [ Wed Jan 08, 2014 4:44 pm ]
Post subject:  Re: Acoustic levitation: how sound can get physical
Amnesia10 wrote:
So are we expecting trains made of corn starch? Non Newtonian Fluids.

With a loud base line.
Author:  davrosG5 [ Wed Jan 08, 2014 6:47 pm ]
Post subject:  Re: Acoustic levitation: how sound can get physical
Science is awesome.

That is all.
Author:  snowyweston [ Wed Jan 08, 2014 7:32 pm ]
Post subject:  Re: Acoustic levitation: how sound can get physical
l3v1ck wrote:
With a loud base line.
My immediate thoughts exactly - the bigger the object, the lower the frequencies will need to be to generate wavelength-nodes large enough for them to get trapped in - at which point you'd be looking at some serious displacement - and the (I suspect) electrostatic units they're using would readily need to be replaced with (ever-larger) traditional diaphragm-construction loudspeakers - which are incredibly inefficient with regards what input (electrical) power actually gets converted into soundwaves.

So really, the current employment of electromagnetic tech (like that in the maglev) is already a more refined concept (in that it forgoes the lossy sound-making part) - so as interesting, and fun, a concept as it is - it's smacks a little of scientific fancy.

Also, the video is horribly misleading to suggest they were using Strauss to do any of that - in truth it would have been one, or a harmonic range of, monotone(s).
Author:  Amnesia10 [ Wed Jan 08, 2014 8:40 pm ]
Post subject:  Re: Acoustic levitation: how sound can get physical
Having thought about the video somewhat more. I think that it might have some uses in sorting objects. It would depend on what would happen if the objects are bigger or much smaller than the standing wave.
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