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Re: Damping panel vibrations with a viscous membrane

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Scott Dorsey to Anton Shepelev:

> > I  am   considering  employment  of the Tecsound
> > membrane:
> >
> >    http://www.texsa.com/en/pl39/productos/id62/tecsound.htm
> >
> > to the internal surface of my loudspeaker  cabi-
> > nets to reduce panel resonances.
>
> My  suspicion  is  that this stuff mostly works by
> adding mass, and that the less mass you  add,  the
> less it works.  It may also provide some reduction
> in radiation because of the impedance  discontinu-
> ity but I suspect that isn't much.

In  that  case  it  is  a rather weak solution to my
problem.  I thought it added a good deal  viscosity,
and therefore dissipative energy losses as well, be-
cause this membrane is said to be as effective as  a
layer  of  lead  of identical surface density, and I
think it is mainly due to its viscosity that lead is
a very effective damper:

   http://www.bonavolta.ch/hobby/en/audio/lo_damp.htm

> There  would seem plenty of less expensive ways to
> add mass, some of which might  also  add  rigidity
> too.

My  primiary objective is damping via energy losses.
Sand-filled  sandwiches  are  excellent  but  a  su-
pererogation for my small cabinets.

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Damping panel vibrations with a viscous membrane Anton Shepelev <anton.txt@gmail.com> - 2017-01-10 22:00 +0300
  Re: Damping panel vibrations with a viscous membrane kludge@panix.com (Scott Dorsey) - 2017-01-11 14:00 -0500
    Re: Damping panel vibrations with a viscous membrane Anton Shepelev <anton.txt@gmail.com> - 2017-01-12 19:21 +0300

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