2018 Volume 49 Issue 4 Pages 787-792
From 2016 the outside noise regulation becomes severe. And from 2020 fuel efficiency standards will become strict too. However, it is extremely difficult to achieve both further weight reduction and higher performance of soundproofing properties. Therefore, we focused on the material itself of the fibrous porous material. In the development of soundproof materials, prediction method of the acoustic properties is important. The purpose of this study is to formulate the relationship between fibrous characteristic and Biot parameters. Therefore, we prepared 60 samples with different fiber diameter and bulk density and measured Biot parameters of them.
