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Research on vibration and underwater radiated noise of ship by propeller excitations

FU Jian;WANG Yong-sheng;DING Ke;WEI Ying-san;College of Marine Power Engineering, Naval University of Engineering;  
The finite element method(FEM) and boundary element method(BEM) are used to calculate the structure vibration and underwater radiated noise of ship structure caused by the propeller excitations. It is analyzed and compared that the influence of vibration and underwater radiated noise are caused by three direction forces(shaft, transverse and vertical). The study shows that the vibration response appears line spectrum at axial passing frequency(APF), blade passing frequency(BPF), 2BPF and ship nature frequencies. The underwater radiated noise is the biggest excited by the transverse force, then is the vertical force, last is the shaft force. The biggest radiated noise power of ship hull by three forces is mainly excited by transverse force at BPF, then is excited by shaft force at APF. It mainly berceuses that the BPF of transverse force is approach with ship nature frequency.
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