The study on the effect of the lateral vibration of shafting on underwater structural acoustic radiation

摘要

For the propeller running in the non-uniform wake fluid field, the lateral vibration of shafting is caused by the lateral propeller-excited force. The lateral vibration of shafting is transmitted through bearing supporting to underwater structure, which causes strong radiated noise from underwater structure. In this paper, the finite element method is adopted to build the finite element model of underwater structure with shafting, and calculate the vibration response of nodes on the interface between the structure and the fluid. The direct boundary element method is used to calculate the underwater structural acoustic radiation. Base on the finite element model, the effects of different stiffness of front or rear shafting bearing and different stiffness of supporting structure on reducing underwater structural acoustic radiation caused by the lateral vibration of shafting are discussed.