Convert Extreme sound into usable energy

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Discussion Overview

The discussion centers around the feasibility of converting extreme sound from a nearby freeway into usable energy, specifically electricity or heat to power a generator. Participants explore the potential methods and challenges associated with this concept.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant expresses a desire to convert freeway noise into usable energy, questioning the possibility of using sound to generate electricity or heat.
  • Another participant dismisses the idea, suggesting that it is not feasible.
  • A different participant explains that while sound can be converted into electrical current (as with microphones), the scale and efficiency required to generate significant power from noise at a distance are unrealistic.
  • One participant estimates that the power generated would be on the order of microwatts, questioning whether that amount is considered usable.
  • A later reply reinforces the earlier points, stating that significant electrical power generation from freeway noise is not possible and suggests looking into health-related effects of such noise instead.

Areas of Agreement / Disagreement

Participants generally agree that generating significant electrical power from freeway noise is not feasible, though there is some debate about the exact amount of power that could be generated and whether it could be considered usable.

Contextual Notes

Participants note the limitations of sound power conversion and the unrealistic efficiency required for practical energy generation from noise. There is also mention of health-related concerns associated with exposure to freeway noise.

Silentkitty2
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Our backyard backs up to a major freeway u need hear protection to stand at the back gate for to long we r less then 20 feet from the edge of the road id like to turn this extreme noise into usable energy... is there anyway to convert it into electricity or use some kind of aperatise to convert it into heat and then power some kind of a generator to make the electricity or something in those works?
 
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ah.. no... sorry but just give up on that
 
Sound power is small... you can convert sound into an electrical current, that's what microphones do. But in order to have 1 W of power from an engine 20 feet away you'd need a microphone several square meters big, and with 100% efficiency (totally unrealistic). I know something about the price of normal microphones and I don't think it's a good idea... :D
 
I'm guessing results on the order of microwatts. Do you consider that usable?
 
Silentkitty2, Welcome to Physics Forums!  :)

The above responses are correct: you would not be able to generate any significant electrical power from that noise.

That noise is not good for you and your family. You could search using Google for “health-related effects of freeway noise”. For a good overview of the subject and what can be done, see:

"Highway traffic noise barriers"

http://www.fhwa.dot.gov/environment/noise/noise_barriers/design_construction/keepdown.cfm
 

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