@article {Sugie:2019:0736-2935:6430,
title = "Sound insulation performance of double leaf wall improved by inhomogeneous application of adhesive",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2019",
volume = "259",
number = "3",
publication date ="2019-09-30T00:00:00",
pages = "6430-6437",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2019/00000259/00000003/art00050",
author = "Sugie, Satoshi and Nitta, Ryuma and Toyoda, Emi",
abstract = "Double-leaf walls are often made of two or more sheets of gypsum board to offer enhanced sound insulation. Sound insulation depends on how the adhesive that bond the gypsum sheets is applied, even if the adhesive is not a viscoelastic material. This study tested various applications
of adhesive for their effects on the wall's insulation performance for high-frequency sound, including the critical coincidence frequency fc. First, we measured the sound reduction index R for several types of gypsum boards laminated with various application patterns of adhesive, such as dots
and lines. We found that the application pattern affects the bonding area. The sound reduction index R at fc was shifted to lower frequency if the bonding area was larger. Second, the tests showed that R can be improved for the frequency range around fc if adhesive is applied heterogeneously
so that the bonding area is different for each part of the board. Moreover, we have found that the sound insulation performance of a double-leaf wall built of boards bonded with inhomogeneous application is increased by more than 5 dB, in comparison with the performance of a wall with homogeneously
applied adhesive, even if the total amount of adhesive is the same in both cases.",
}