Research on Mechods of Reducing Underwater Structure Acoustic Radiation Caused by Longitudinal Vibration of Shafting

摘要

In this paper, three methods that can reduce the underwater structure acoustic radiation caused by longitudinal vibration of shafting are mainly discussed. The finite element model of underwater structure with shafting is built, and the vibration response of structure is calculated by ANSYS. The characteristics of structural acoustic radiation are investigated by the direct boundary element method. Based on the finite element model, the effects of the vibration and acoustic radiation of underwater structure are discussed. They are caused by different excitation force propagation paths and the introduction of vibration isolator or dynamic vibration absorber. The results show that the acoustic radiation of underwater structure can be reduced effectively by the proposed methods.