ABSTRACT
Sound transmission loss (STL) through lightweight double-leaf partitions stiffened with periodically placed studs is modelled theoretically. The model treats the studs as translational and rotational springs with mass, and accounts for the dynamic effects of the stud. Although the model is limited to two-dimensional (2D) partition walling, the close agreement between predictions and test data demonstrates that it can predict correctly the trend of STL versus frequency curve and provide the much-needed physical insight into the mechanisms of sound transmission across such partitions. Many features of periodic model are evident, associated with the structure of pass- and stop-band for structural wave in the partition. The model also reveals that threedimensional (3D) modelling is needed in order to fully address issues such as the nature of stud-panel contact (line versus point), out-of-plane bending stiffness of stud, and boundary conditions.
