Hydro-elastic analysis for dynamic characteristics of marine propellers-using finite element method and panel method
LI Jiasheng1,2, ZHANG Zhenguo1,2,HUA Hongxing1,2
1.State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China；
2.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE), Shanghai Jiao Tong University,-Shanghai 200240, China
A mechanical model was built for the double-direction fluid-structure interaction problems of marine propellers by the 3D frequency domain panel method combined with the finite element method.The added mass and damping matrices due to fluid-structure interaction were derived, and effects of propeller’s skew angle and incoming flow velocity on the two matrices were analyzed.The results showed that the incoming flow velocity significantly affects the added damping matrix, but it has little effect on the added mass matrix; when considering the effect of added mass, the larger the skew angle of propeller, the more the first order bending modal frequency of the propeller drops, while the opposite trend is observed for the first order torsional modal frequency of the propeller.The study methods and results provided a theoretical reference for design of low-noise propellers.
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