Re: [ATM] new type of floating cell

["Nils Olof Carlin" <nilsolof.carlin@telia.com>]

Jan,

> In the recent issue of Yvan Krastev's ATM letters is an article about
> placing a (large) mirror on a rubber mat with a central hole. It's
> calculated that the deformation is much less the deformation of caused by
> an
> 18 and 27 point PLOP-type cell. I tried to go through the math, but I
> don't
> understand most of it. If it's true, building cells will be very easy from
> now. Krastev's  website can befound at
> http://members.kabsi.at/i.krastev/atmlj/ .

Could you give us a clue as how that mat is supposed to work? Obviously, the
more evenly you can spread out the supporting forces, the less deformation -
always provided you can actually get the forces really evenly distributed.
Bubble wrap, carpet and astroturf give more or less useful approximations -
but wih a rubber mat, as I see it (Krastev's rubber mat may be different),
the force at any point is proportional to the compression of the rubber
there - fine if you can really assure that the back of the mirror, the
support and the rubber are all uniform and flat - and the problem of cooling
still must be handled.

Nils Olof


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