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Natural Science Forum / Physics / Acoustics / March 2006Noise Isolation using Inflatable Disk
Hi all, I'm looking into the possibility of using a 32 feet diameter by 8 feet thick transparent, inflatable disk to provide noise isolation between two spaces connected by a 32 feet diameter overlook. The analysis looks good. Anyone know if this has been done before? - Jon Jon, I know you must know what you are talking about, but it sure is not clear to me. Please clarify. > Hi all, > [quoted text clipped - 6 lines] > > - Jon >>I'm looking into the possibility of using a 32 feet diameter by 8 feet >>thick >>transparent, inflatable disk to provide noise isolation between two spaces >>connected by a 32 feet diameter overlook. The analysis looks good. >>Anyone >>know if this has been done before? The Tl depends only on the area mass of the membrane. By inflating, I presume that two layers of the same membarne are presented. But as you can see, like Noral, I really do not know the geometry of the apparatus you propose. Inflating seals for doors, etc. have long been in use. Might you be more spectific? Ang. C. >>> I'm looking into the possibility of using a 32 feet diameter by 8 >>> feet thick [quoted text clipped - 14 lines] > > Ang. C. Isn't it possible that the structure "works" as a double wall, giving some "extra" TL compared to mass law on certain frequency bands? Further info on structure wellcomed as well:) BR, ari >>>> I'm looking into the possibility of using a 32 feet diameter by 8 >>>> feet thick [quoted text clipped - 22 lines] > > ari Sorry, I'm often accused of being the only one to know what I'm talking about.:-) This is an existing school library with a 32 feet diameter hole in the middle of the floor which overlooks the central hallway. One of the items I propose to plug the hole is an inflatable balloon in the shape of a whoopie cushion or convex lens. The losses appear to be related to the density of the balloon skin with peak frequencies related to the dimensions of the balloon. - Jon Now that I understand it, I would concur with others that a reasonable first approximation would be mass law for the two layers plus the effect of the air space without absorption. It is not likely to give really high isolation, but could be a significant improvement over a full opening. >>>>> I'm looking into the possibility of using a 32 feet diameter by 8 >>>>> feet thick [quoted text clipped - 35 lines] > > - Jon |
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