Fluffy fans probably more quiet.

[Skybuck Flying]

Hello,

A few days ago I cleaned the air hole above my furnace. This hole sucks
stinky kitchen air out of the kitchen and blows it up into the sky through
tubes.

I noticed how this hole started to hum after it was cleaned.

Apperently the fluffyness that was on it, either reduced the airflow, or it
simply distorted waves of sound.

So my theory/hypothesis is now basically very simple:

Even surfaces will lead to oscilliation/resonance of sound waves.

The smoother/even a surface is the more sound it will produce.

By adding fluffyness or perhaps other bums/imperfection it will break the
oscilliation and perhaps lead to more distortion/barely noticeable sound.

Or perhaps the fluffyness itself is responsible for petting the sound waves.

It's probably as soft as a feather/hairs... it's composition is probably
human dust and some oil/benzine burned particles from cars and busses.

Not sure if some special grease must be used for the fluffyness.

But it's worth a shot to apply to fans and see if this will actually make
them more quite, or more loud.

I do know if fans get stuff in their shaft that it will produce terribly
sounds... but maybe if it's on the blades it actually reduces sound... my
expectation would be that it increases sound... but perhaps this is wrong.
Or perhaps it depends on the pattern of fluffy.

The fluff looked like little hairs, with air gaps between them... as if it
was stroking the air gently ! =D <- probably breaking sound waves.

Bye,
Skybuck.

 

[[email protected]]

Hello,

A few days ago I cleaned the air hole above my furnace. This hole sucks
stinky kitchen air out of the kitchen and blows it up into the sky through
tubes.

I noticed how this hole started to hum after it was cleaned.

Apperently the fluffyness that was on it, either reduced the airflow, or it
simply distorted waves of sound.

So my theory/hypothesis is now basically very simple:

Even surfaces will lead to oscilliation/resonance of sound waves.

The smoother/even a surface is the more sound it will produce.

By adding fluffyness or perhaps other bums/imperfection it will break the
oscilliation and perhaps lead to more distortion/barely noticeable sound.

Or perhaps the fluffyness itself is responsible for petting the sound waves.

It's probably as soft as a feather/hairs... it's composition is probably
human dust and some oil/benzine burned particles from cars and busses.

Not sure if some special grease must be used for the fluffyness.

But it's worth a shot to apply to fans and see if this will actually make
them more quite, or more loud.

I do know if fans get stuff in their shaft that it will produce terribly
sounds... but maybe if it's on the blades it actually reduces sound... my
expectation would be that it increases sound... but perhaps this is wrong.
Or perhaps it depends on the pattern of fluffy.

The fluff looked like little hairs, with air gaps between them... as if it
was stroking the air gently ! =D <- probably breaking sound waves.

Well, you've just blown your chance to patent the idea, I think, but it sounds like it should work.

You know, it might even decrease prop noise for aircraft, blade noise in jet turbines, or even nuclear submarine props...


Mark L. Fergerson

 

[[email protected]]

Hello,

A few days ago I cleaned the air hole above my furnace. This hole sucks
stinky kitchen air out of the kitchen and blows it up into the sky through
tubes.

I noticed how this hole started to hum after it was cleaned.

Apperently the fluffyness that was on it, either reduced the airflow, or it
simply distorted waves of sound.

{trimmed}

Some fans are made with little grooves at the edges to make them
quieter, in imitation of the feathers of bird whose dinner depends on
stealth.

 

[Lasse Langwadt Christensen]

Well, you've just blown your chance to patent the idea, I think, but it sounds like it should work.



You know, it might even decrease prop noise for aircraft, blade noise in jet turbines, or even nuclear submarine props...

I'm sure everything from hair to simulated feather and scale have been tried
and is used if it works

probably just didn't clean it properly so no it is out of balance ...

-Lasse

 

[cameo]

Well, you've just blown your chance to patent the idea, I think, but it sounds like it should work.

Gun silencer might be a good application for this idea, too.

 

[Mr. Man-wai Chang]

Apperently the fluffyness that was on it, either reduced the airflow, or
it simply distorted waves of sound.
So my theory/hypothesis is now basically very simple:
Even surfaces will lead to oscilliation/resonance of sound waves.
The smoother/even a surface is the more sound it will produce.

I remember doing physics questions about sound wave in a pipe...

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[rickman]

Gun silencer might be a good application for this idea, too.

I think this could be used on the wings of birds of prey that need to
swoop down silently on their victims... oh, wait! Owls already do that,
don't they!

 

[[email protected]]

Hmmm, the navy would not like hairy props !!

If they are significantly quieter than smooth props, they'll like them just fine!


Mark L. Fergerson

 

[Robert Baer]

Hello,

A few days ago I cleaned the air hole above my furnace. This hole sucks
stinky kitchen air out of the kitchen and blows it up into the sky
through tubes.

I noticed how this hole started to hum after it was cleaned.

Apperently the fluffyness that was on it, either reduced the airflow, or
it simply distorted waves of sound.

So my theory/hypothesis is now basically very simple:

Even surfaces will lead to oscilliation/resonance of sound waves.

The smoother/even a surface is the more sound it will produce.

By adding fluffyness or perhaps other bums/imperfection it will break
the oscilliation and perhaps lead to more distortion/barely noticeable
sound.

Or perhaps the fluffyness itself is responsible for petting the sound
waves.

It's probably as soft as a feather/hairs... it's composition is probably
human dust and some oil/benzine burned particles from cars and busses.

Not sure if some special grease must be used for the fluffyness.

But it's worth a shot to apply to fans and see if this will actually
make them more quite, or more loud.

I do know if fans get stuff in their shaft that it will produce terribly
sounds... but maybe if it's on the blades it actually reduces sound...
my expectation would be that it increases sound... but perhaps this is
wrong. Or perhaps it depends on the pattern of fluffy.

The fluff looked like little hairs, with air gaps between them... as if
it was stroking the air gently ! =D <- probably breaking sound waves.

Bye,
Skybuck.

Better yet: add fluffiness to Congress Critters!