Vibration Analyses And Noise Prediction Of 94.8m Container Ship

Extensive vibration of ships can not only cause damage of structural components and malfunction of on-board devices, but also influence ship comfort and crew’s health. Thus, they all necessitate the implementation of ship vibration and noise control treatments. Previously, empirical formulas from cods or books were used to approximately evaluate the vibration levels, which is hardly to satisfy the design requirement for vibration and noise reduction. As the progress of computing technology, finite element method(FEM) and statistical energy analysis(SEA) methods become popular in the vibration analysis and noise prediction of complex structures.In this paper, a 94.8 m container ship has been targeted for vibration analysis and noise evaluation under two cases of fully loaded TEUs departure and ballast arrival. Firstly, a 3-D finite element model of the whole ship is established, the dynamic characteristics of the ship are computed, and the vibration responses of the stern and superstructure are predicted under the propeller-induced surface force. Then, the sound pressure levels in stern and superstructure cabins are calculated by using SEA method. The results show that, when the ship is navigating, the noise induced by structural vibration plays a dominant role.The predicted results can provide useful indicators for selecting vibration and noise control strategies during the preliminary design of the targeted ship. And the methodology and procedures developed in this paper will also be useful for some practical engineering applications.