Mitigating sound transmission through double-panel partitions at low frequencies is investigated, by using an optimally designed long T-shaped acoustic resonator array embedded along the boundaries. Design procedure of such a system is systematically presented. First, the control mechanism using acoustic resonator in different frequency bandwidths is studied. It is found that in a relatively broadband control, the absorption by the resonator damping governs the control performance; on the contrary, in a narrow band control, the interaction between the air gap and resonators plays a dominant role. Second, the effectiveness of the resonator in the sound transmission reduction through the double-panel partition is evaluated at different frequencies of interest. It is found that most resonance peaks can be well controlled by properly tuning and locating acoustic resonators, with a few exceptions. Third, an optimal design tool for determining the locations of resonators is developed. Finally, a series of tests are carried out to validate the analytical and numerical findings under laboratory conditions.
ASJC Scopus subject areas
- Acoustics and Ultrasonics