Converting noise into electrical energy

sophiecentaur

How much energy is floating around as 'vibrations'? Unless you can quote some actual figures the notion is groundless.
And which "other waveforms" did you have in mind? You need to specify if you want to be taken seriously.

sophiecentaur

Listen, chaps. IFFFFF there were enough 'free energy' floating around then could someone explain to me how incredibly weak broadcast signals can be picked up and understood, despite all this energy being out there? The amount of 'FREE' RF power in all the broadcast bands just HAS to be a lot less than the TOTAL Power that can be received in the form of broadcast signal energy.
Just tune up and down the bands and you will get a good indication of what signals are available. Most of those receivable signals will have powers of 1microWatt or less. So, if you could receive AND USE a million of them, you'd have just ONE WATT to play with.
Ye Gods - get real. If it could be done, it WOULD be.

How can anyone seriously argue otherwise.

Mahipat Singh

Could we collect Sound waves in a machine or any sonic instrument ?

If yes, than we can reproduce it in Electric energy !

sophiecentaur

The answer is, as said earlier, YES - - - BUT.
And that 'but' is so very relevant, because it's all a matter of 'how much energy?' These things are only worth doing if you get back the cost of doing them.

All microphones convert the sound that hits them into electrical energy. If you put a microphone at the focus of a large paraboloid reflector then you will direct more sound energy onto it and, hence, get more electrical energy out of it. However, the principle always applies that you will never get more energy out of a system than is put in.

Having established the principle then you have to consider whether it's a worth while exercise. How much sound power is available? Let's get things in proportion. We sustain permanent hearing damage if we're exposed to sound at a level exceeding 1mW per square metre. To collect just 1W of power from sound at that level, you would need 1000m² of collecting area. (Worth it? - I don't think so) And, in any case, where could you fit a collecting area of that size or what source would actually be that loud at a suitable distance where you could fit a reflector that big?
Normal levels of sound noise around us are around one thousandth of this level so, without deafening ourselves, we would get just 1mW from the same collector. People don't seem to realise just how important the actual NUMBERS are in discussions like this.

There are places where the sound levels are higher than the level for hearing damage. A jet engine (an old fashioned noisy type,I suspect), 30m away, produces 1kW per m² in the 'loudest' direction but how would you gather it? There's no way you could have a 30m/30m collector anywhere on an airport (start of a runway?????? Joke) and for how long per day would it be collecting this energy? The fact is that modern jet engine design has vastly improved efficiency, due to the fact that the air flows through it differently and it just doesn't produce so much noise. This has reduced sound noise AND all the time the engine is running on less fuel! There is far more benefit from preventing the production of sound noise than you could ever get by (trendy word coming up) 'Harvesting' sound energy.

People are quite happy to believe that Engineers get it right when designing electronic systems, aeroplanes and electrical power distribution. They get it right because they Do the Sums with the available Figures. They don't say "let's build a power station - I've drawn a sketch of what it will look like so let's get started". They do serious calculations involving structure, fuel supply and expect levels of generation eetc.. If just one part of the design is not right then the power station (aeroplane / TV / city / car) will FAIL and cost someone a lot of money (or a life).

The Figures involved in Harvesting sound energy indicate that it is just not worth it. If someone can suggest a situation where it should be considered and there is actually a significant amount of free, 'concentrated' sound energy around then they need to suggest some figures for just how much power would actually be available and what it would cost to 'collect it'. I am not aware of a single 'sound harvesting' scheme anywhere (and there are some very wacky alternative energy schemes about) and I am not at all surprised, because the numbers just don't add up. When the total energy needed to produce a system is greater than the total energy it will produce over its life then you need to ask questions. (Oh boy, did someone say Nuclear?)

Mahipat Singh

Sound has waves and it needs to collect in the machine or instrument like a room where we can get lot of noise from outside. If this process we can keep than it will become mini electric power station and sound/noises pollution will reduce.

But little bit experiments are happening in world, the exact results are awaiting or taking time !

As i wrote my formula : E=V (electric energy = sound energy), this energy we can transfer one place to other place without wire.

sophiecentaur

Absolutely right. The question is HOW MUCH energy?
If someone tells you they have opened a business which earns them money, you would be impressed it it involved £10,000 per week but not so impressed with 10p a week. It's the same with these free energy sources. No one has demonstrated any significant AMOUNT of energy around us because there isn't any more than we can hear. That wouldn't raise a flicker in a small LED.

Mahipat Singh

Hello, Sir,

thanks to your reply,

I am searching someone who can work on WI-FI electric transmission generated from "Sound Waves" for routine work purpose ?

Like we are getting heat from Sun Rays.

sophiecentaur

It is well known that we receive around 1kW from the Sun on every metre square of the Earth's surface. This means that we have a viable source of 'free energy' (pretty much the Only Energy source the Earth ever had).
The sums tell us that solar energy is viable and it is. The sums tell us that there is NOT enough energy in the form you describe. If you have aspirations of ever becoming a 'real' Scientist or Engineer then you must acknowledge that the Actual Values are at least as important as the arm-waving general principles. Adjectives are not enough in arguments like this. You don't run a motor on adjectives - it needs real power.

You seem to be combining two concepts here - Free Energy from background sound and Wireless power transmission. Neither of these is very well established. Perhaps you should look at one at a time.

Mahipat Singh

Hello, anyone can tell me now what are the frequencies of sound in environment ?

If there are varying sound in diff. frequencies, than we are capable to collect and re-use it by help of machine.

sophiecentaur

Have you actually read any of this thread?
How much energy do you need? How much is available? Which number is greater? That is the answer to your question.
I really hope that you don't approach your personal finances in the same way that you are looking at this 'free energy idea'.

gani11vlr

ya....it is possible......but i think small amount of electricity is produced.....but it is applicable for cell phones.....used for charging while talking........every particle is disturbed by a force...our sound signals disturb the particles...due to vibration of atoms....electrons are moved....under this condition we can able to produce electricity.....

maimonides

Well, if you know it can be done:
don´t talk, DO IT!
You can buy noise powered electric generators for little money. They are called dynamic microphones. (Or you might use a loudspeaker, works just the same or even better: more area, more energy.) Get one, connect your phone to it and wait for "fully charged".
Or try to power a 1ma LED first and then go bigger/optimize.
Have fun with it.

sophiecentaur

You really should try to get real about this idea. There is only enough power in your voice to move the microphone transducer. This is followed by am amplifier which needs a POWER SUPPLY. Where's your free energy?
Afaik, the only device ever used which was powered by speech was the old wax cylinder recorder. Shouting at it would produce enough mechanical vibration to record a pattern in the soft wax. You still had to turn the cylinder with added power.
If you are not prepared to include figures in your argument, your opinion has no weight

satheeshg89

Thanks for helping with my ideas. here i do have some suggestion of using a transducer which can convert any form of energy into electrical energy. though the 2nd law of thermodynamics prevent us by using the sound energy as an electrical energy here comes a device sonea. dn y dnt we try for another device which would be a combination of both sonea and transducer.
plz do mail me @ satheeshg89@gmail.com. i think if we all work hard with a cordination our project will be a successfull one.

i suggest every member who work for it to share their details for a combined work

sophiecentaur

You still don't seem to be getting the basic flaw in what you are saying. There are many transducers that produce electrical energy from sound. The fact is that there is NOT ENOUGH ENERGY available to make it worth while. Stand and listen. Does the sound around you knock you off your feet or even make leaves tremble? If there isn't sufficient energy for this then there isn't enough to produce a useful amount of electrical Power.
You are not suggesting anything New. You are just revisiting something that has already been considered and discarded with good reason.

sophiecentaur

With respect, why can you not have the courtesy to use proper spelling? There is no limit to the number of characters allowed on this site and much of what you write is unintelligible. You are not just talking amongst your friends on this forum. If you look at what other people write, you will see that they, mostly go to some trouble to write properly and in full.

What are you actually talking about?

Khashishi

Sorry, there's prior art on this one. I saw some people working on something like this in some energy conference at MIT Museum of Science. They were hoping to power some small lights in a tunnel off of traffic noise, I think.