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Sonic power

 Power generation from sound of engine exhaust gases
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fit transducer before silencer meant for engine discharge gases discharge noise reduction. the transducer would converter sound waves (noise) into power. of course, it would create some back pressure but that can be compensated by slightly reducing silencer length. this arrangement would be easier from maintenance point of view. alternatively, integrate sound to power transducer with silencer itself.
—vedarshi, May 28 2004

A discussion of acoustic energy http://www.quiet.org/tatum.htm
[ldischler, Oct 04 2004, last modified Oct 05 2004]

New Device Turns Waste Heat [into sound and then] into Electricity http://www.livescie...nd_electricity.html
[ldischler, Jun 09 2007]

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       if it is vibration of air molecules, let's consider piezoelectric pwoer generator. whatever small be the magnitude of power generated, it would be energy recovery. also if you remove the silencer,you may (or may not be able to) listen to the noise produced by engine.
—vedarshi, May 28 2004
   

       If the output is at 120 dB, that’s equivalent to one watt per square meter—in other words, nada. (see link)
—ldischler, May 29 2004
   

       if 1 watt per sq metre can be generated with 120 dB, imagine about railway tracks and the rattling sound due to gap kept at regular intervals for expansion.this situation still exists in many countries & not going to change in near future. any estimate about the noise level due to rattling & the weight of piezo system per watt generation capacity ?
—vedarshi, May 29 2004
   

       Unless you measure it at the wheel itself, the clack of a train is a whole lot less than 120 dB, with the sonic energy proportionally less. And what you could somehow extract will be a minute part of that. So the whole notion is unworkable.
—ldischler, May 29 2004
   

       I think it's easier to see that next to no energy comes from sound by the fact that such little energy is necessary tomake sound. You can nick a bell with your fingernail and it's audible for a hundred feet, but your finger hardly even notices the energy lost in the nick.
—Cheekio, May 31 2004
   

       [cheekio]excellent explanation using simple example. i highly appreciate that.
—vedarshi, May 31 2004
   


 

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