Prediction of structure-borne sound of fluid-loaded structure

This paper presents the theoretical method to predict the propagation of structure-borne sound of fluid-loaded structure by using Statistical Energy Analysis (SEA). The effects of fluid on sound transmission are considered as the change of mode number and the increase of internal loss factor of fluid-loaded elements in the specified frequency range of SEA model. The complex-valued added mass is used to describe the fluid loaded effect and the sound pressure propagation to the adjacent plate in the fluid is evaluated as the change of transmission coefficient at L and X-type junction consisting of fluid-loaded plates. These analytical procedures are applied to determine the vibration energy transmission in the plate structure containing the water tank. The calculated results agrees well with the measured one and the availability of this method is confirmed.