Speaker
Description
Lightweight building materials such as cross-laminated timber (CLT) are highly susceptible to flanking sound, where vibrational energy is transmitted between two building components across a common junction. Resilient strips or pads can be added at the junction to decouple the components and, as a result, reduce flanking sound transmission. While effective, the performance of these solutions is difficult to predict. Typically, flanking sound transmission is analyzed with models based on plate or shell theory, but these are limited to simple homogeneous junctions with thin panels. While full-scale finite element analysis is possible, its computational cost at high frequencies is prohibitive as very fine element meshes are required. In the current study, an approach is presented which exploits the spatial periodicity often exhibited by CLT junctions. This allows the use of Bloch-Floquet analysis of the junction itself and the connected building components. The junction is treated as an elastic solid with an arbitrary level of complexity and spatial periodicity in the junction direction. Statistical Energy Analysis (SEA) is employed to compute the vibration reduction indices of the junction. The prediction model is applied to varying CLT junctions with rigid connections, continuous strips or discrete pads.