give us some ideas on the conversion of sound into energy: I still do not see anything precise
I put in the past scientific links, this time this one with a course of essential essentials succinct:
http://www.sft.asso.fr/Local/sft/dir/us ... stique.pdf
traveling-wave thermoacoustic electricity generator
original:
http://arxiv.org/PS_cache/physics/pdf/0 ... 0086v1.pdf
more efficient:
http://www.springerlink.com/content/y33h67h067146367/
http://en.wikibooks.org/wiki/Engineerin ... oacoustics
http://data.mecheng.adelaide.edu.au/avc ... as2005.pdf
http://digital.library.adelaide.edu.au/ ... ers1-4.pdf
http://www.acs.psu.edu/thermoacoustics/ ... atents.htm
http://www.acs.psu.edu/thermoacoustics/ ... ations.htm
Serious articles published:
http://www.mendeley.com/research/a-100- ... generator/
I never put it because I see it for the first time.
There is a variety of English in memory.
The basic principles are those of the resonators, often 1 / 4 of wave size given by the speed of the sound 330m / s for the air and the quarter of the wavelength. like organs, flutes, 1 / 4m = 25cm = 330 Hertz, if at standing wave.
but there is a progressive wave, so a wider band.
Like feedback waves and oscillators, we can have very complex, chaotic modes of operation, such as electronics, radio, short wave and microwave, which I know better; but similar.
Then the impedance adaptation is crucial, with pipes of variable section, resonances, or even expansive flag, which have a broad band so well built and which exist in large industrial productions shown in photos, (similar technique to that in radio, and microwave that I know better).
This allows to adapt displacements and forces for the transducer which can be what one wants, if adapted, piston, membrane and coil speaker, piezoelectric.
http://fr.wikipedia.org/wiki/Onde_stati ... s_un_tuyau
http://fr.wikipedia.org/wiki/Imp%C3%A9dance_acoustique
http://fr.wikipedia.org/wiki/Son_%28physique%29
http://www.quarter-wave.com/Horns/Horn_Physics.pdf
http://fr.wikipedia.org/wiki/Tube_de_Kundt
http://fr.wikipedia.org/wiki/R%C3%A9son ... _Helmholtz
http://www.ventsdefolie.fr/Zeff/Articles/LCCCM07.pdf
http://petoindominique.fr/php/hp.php
http://fr.wikipedia.org/wiki/Tuyau_d%27orgue