Mechanism of fluid-structure interaction and algorithm for calculating the bearing force of elastic propellers

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (18) : 1-10.

LI Jiasheng1,2,3,4，ZHANG Zhenguo2,3，TIAN Jin5，HUA Hongxing2,3

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Abstract

The study on hydroelastic problems of propellers is of great importance for the vibration/noise reduction of ships. Two-way strongly coupled fluid-structure interaction model for elastic propellers is established. A three-dimensional panel method in time and frequency domains for fluid combined with the finite element method for the structures is developed. The proposed method can solve the full nonlinear Bernoulli formula to determine the driving force directly, which overcomes the disadvantages of the coupled frequency-dependent panel/finite element method. In addition, the computational cost required by the present method is considerable smaller than that of the coupled time-dependent panel/finite element method. It is found that the added-damping due to the fluid are crucial importance in the design of propeller-shaft-ship system. It is also observed that the non-penetration conditions may be imposed on the undeformed surface of the propellers to predict the unsteady bearing forces in the spatially non-uniform inflow.

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fluid-structure interaction/hydroelasticity / vibration / propeller / finite element method / panel method/ boundary element method

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LI Jiasheng1,2,3,4，ZHANG Zhenguo2,3，TIAN Jin5，HUA Hongxing2,3. Mechanism of fluid-structure interaction and algorithm for calculating the bearing force of elastic propellers[J]. Journal of Vibration and Shock, 2020, 39(18): 1-10

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