MAKING SOUND ENERGY USEFUL....

I'd have thought there were much bigger sources of wasted energy to extract.

Exhaust heat, energy dissipated in the suspension, engine vibration.
It seems rather contrary to try to extract power from the smallest source...

Del

I'm trying to decrease the pollution... (sound pollution)...

If u have ideas to extract the energy from other source means tell me.... i will try that also...

Sound energy, pressure waves, is extracted every day, via microphones. Try to take one microphone and hook it directly to a speaker, run it to the other room. What do you get? Not much sound, thats why it needs to be amplified.

The problems is, assuming radial distribution of sound, it decreases in terms of log(radius) to log(radius^2), as I recall.

So the further away you get from a sound source the much less its energy per unit area.

Another problem is there is just not that much energy produced by sound to begin with. I don't know this for sure, just intuition. I havn't done the math but you can. Just go to wikiepdia, look up decibels, convert it to pressure, convert pressure to energy to see if you have enough energy to worry about.

1 watt ~ 120 dB @ 1 meter distance from source.

Still interested? Think of another project.