Quincke space?

[Dulcamara]

Hello all, nice to meet you.
I am doing my first step in acoustic because of work (my company
assigned me the acoustic products and their development). I am trying
to exploit unusual ways to get acoustic insulation and abosorbtion for
buildings rather than the classical vibration dispersing and soft
porous materials. I would like to exploit wave interference and
diffraction. In particular I have an absurd idea and ask you what are
its flaws: think to a movable panel suspended inside a cavity space
with a more porous material on one wall of the cavity. The disturbing
sounds comes from the porous side, could I obtain interference moving
the panel as the moving of the trombone side in Quincke tube
eliminating so the most disturbing frequences? Thank you very much for
your time :)

[Angelo Campanella]

Post by Dulcamara
Hello all, nice to meet you.
I am doing my first step in acoustic because of work (my company
assigned me the acoustic products and their development). I am trying
to exploit unusual ways to get acoustic insulation and abosorbtion for
buildings rather than the classical vibration dispersing and soft
porous materials. I would like to exploit wave interference and
diffraction. In particular I have an absurd idea and ask you what are
its flaws: think to a movable panel suspended inside a cavity space
with a more porous material on one wall of the cavity. The disturbing
sounds comes from the porous side, could I obtain interference moving
the panel as the moving of the trombone side in Quincke tube
eliminating so the most disturbing frequences? Thank you very much for
your time :)

See the SoundBlox product at

http://theproudfootcompany.com/soundblox-information.html

They modify ordinary hollow cement masonry blocks by cutting a slot into the
hollow cavities where an absorber, as well as the porosity of the
cement-cinder mix, absorb over a specified frequency range.

Angelo Campanella



--- news://freenews.netfront.net/ - complaints: ***@netfront.net ---

[Helmut Wabnig]

On Thu, 8 Apr 2010 13:13:19 -0700 (PDT), Dulcamara

Post by Dulcamara
Hello all, nice to meet you.
I am doing my first step in acoustic because of work (my company
assigned me the acoustic products and their development). I am trying
to exploit unusual ways to get acoustic insulation and abosorbtion for
buildings rather than the classical vibration dispersing and soft
porous materials. I would like to exploit wave interference and
diffraction. In particular I have an absurd idea and ask you what are
its flaws: think to a movable panel suspended inside a cavity space
with a more porous material on one wall of the cavity. The disturbing
sounds comes from the porous side, could I obtain interference moving
the panel as the moving of the trombone side in Quincke tube
eliminating so the most disturbing frequences? Thank you very much for
your time :)

I do not know what you mean by "interference".
Could it be this:
http://en.wikipedia.org/wiki/Active_noise_control

(the Wiki article is rather poor)

w.