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Re: material to make acoustic cover

>> cardboard would be strong enough, but needs something rubbery to absorb >> the >> sound, >> can you get rubberised cardboard ? > > I've seen sponge rubber with a latex(-like) deadening layer in it. > it was used to line printer cabinets (for noisy impact printers) > > It may be rigid enough as it is or you could glue it to some cardboard > etc... > > Bye. > Jasen

yeah that sort of thing but I havent come accros any.

I tried cardboard on its own wich was a marginal improvement, although I think it might of cured a light dependant problem id overlooked !

I think ive come to the conclusion that Il have to make a 2 part thing, Im thinking some 0.3mm tin steel sheet will make a support and outer shell, hopefully this is easy enough to bend into a simple U shape and strong enough to not unbend on its own, and line it with some sound absorbing 25mm foam from RS.

not sure how effective this is, the foam will isolate the outer from the chassis too, and cover most of it exept for the underside, hopefully stop any sound geting past it and deaden the sound inside a bit so it doesnt try get out elsewhere.

Is 1M long but only 4"x4", probably dont need to fix it, although the U section might try to unbend, maybe some velcro.

Colin =^.^=

Reply to
colin
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What is the frequency spectrum of the sound? High frequencies can be stopped by a fairly thin cover. Mids and lows are more problematic, and to be most effective the cover needs mass (a steel plate is good, but I wonder if the .3mm stuff you mentioned might be too thin) and especially for low frequencies, to be sealed airtight. I reread your OP, I imagine bearing noise would be mids and highs. While the foam may help (as in deadening out the resonances of the metal plate it's placed against), the majority of your sound reduction will come from the metal plate. The cover (actually the whole enclosure) would best be mounted in a way that is vibrationally isolated from the bearing blocks, else the mechanical vibrations will go directly through to the place which will then radiate the sound like a loudspeaker.

Reply to
Ben Bradley

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I think I might make a sandwich of the foam between two steel sheets, so the outer is completly isolated by the foam, just adhesive holding it together.

Colin =^.^=

Reply to
colin

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