The vibroacoustic behavior of a commonly used floating floor installed in an actual multifamily housing unit was investigated to determine the factors that influence impact sound transmission at low frequencies. A finite element vibration model of the floor structure and an experimental sound field against a rubber ball impact were analyzed in combination. The results indicated that, in addition to isolation of the impact energy above the system's natural frequency, the aspect of coupled and decoupled wave fields of the floating floor influences the impact sound transmission. The coupled wave field below the natural frequency is dominated by the bending wave field of the base slab and exerts a strong influence on the sound field, in which the sound field is dependent on the modal space and impact location of the coupled motion. The decoupled wave fields generated in the floating plate or the base slab above the natural frequency may disturb the vibration isolation. The non-rectangular acoustic cavity is considered to mitigate the influence of axial room modes on the impact sound field.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) Grant (no. 2011-0018360 ) funded by the Korea Government ( Ministry of Science, ICT and Future Planning (MSIP) ). The authors are grateful to SK Engineering & Construction for the use of the experimental field.
© 2015 Elsevier Ltd.
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Civil and Structural Engineering
- Geography, Planning and Development
- Building and Construction