Parametric study of sound transmission through lightweight floors

A parametric study on the direct sound transmission through lightweight floors was conducted. Parameters changed involved the framing members, ceiling mounting and thickness, and floor topping. This paper presents the effect of these changes on several different standard sources: airborne and light impact (according to ISO 140 parts 3 & 7 respectively) and two heavy impactors, the ball and bang machine (according to JIS A 1418-2). It is found that the changes to the specimen have very similar effects on the sound insulation for all sources except the Bang machine. The different effect is due to the extreme forces the bang machine exerts on the floor-ceiling system driving it into non-linear regions.Une \ue9tude param\ue9trique sur la transmission acoustique directe \ue0 travers des planchers de construction l\ue9g\ue8re a \ue9t\ue9 r\ue9alis\ue9e. Les param\ue8tres chang\ue9s visaient les \ue9l\ue9ments d?ossature, le montage et l?\ue9paisseur du plafond, ainsi que le mat\ue9riau de rev\ueatement de sol. Ce document pr\ue9sente l?incidence de ces changements sur plusieurs sources normalis\ue9es diff\ue9rentes : bruits a\ue9riens et de faible impact (suivant la norme ISO 140, parties 3 et 7, respectivement), et deux (2) machines \ue0 impacts de type intensif, soit la machine \ue0 balles et la machine \ue0 d\ue9tonations (suivant JIS A 1418-2). Il s?av\ue8re que les changements apport\ue9s \ue0 l?\ue9prouvette ont des incidences tr\ue8s similaires sur l?isolation acoustique pour toutes les sources, \ue0 l?exception de la machine \ue0 d\ue9tonations. L?incidence diff\ue9rente est attribuable aux forces extr\ueames qu?exerce la machine \ue0 d\ue9tonations sur l?ensemble plancher-plafond, jusque dans des r\ue9gions non lin\ue9aires.Peer reviewed: NoNRC publication: Ye