Abstract：Propeller-shaft systems and hull stern coupling vibration is the most important factor for hull vibration and noise reduction. To find out the basic excitation mechanism has important significance to the recognition and efficient control of vibration and noise. According to the operating state of shafting, the factors such as operating conditions, alignment state, and exciting force which have an effect on shafting-base-hull coupling vibration are based on FEM rotor dynamic theory to analysis. Under the straight alignment, the oil and water film 8-dynamic coefficients are calculated by Reynolds equation for four shafting operating states, the stiffness and damping matrices of single multipoint support bearing are established, the FEM of shafting-base-hull is established. Based on this, alignment state effect on shafting-base-hull coupling vibration is analyzed by FEM power flow, according the result of system dynamic response. The result shows that different operating states can induce different internal stress, different bending deformation and then the change of bearing characteristic. With the corresponding, the power flow passed hull can change which induce system coupling vibration and cause different noise.
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