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| Investigation on the modelling and computational algorithm for fluid-structure interactions of propeller-shafting systems |
| LI Jiasheng1,2,3,ZHANG Zhengyi1,2,HUA Hongxing4 |
| 1.School of Naval Architecture & Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
2.Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships (DTSSS), Wuhan 430074, China;
3.Hubei Key Laboratory of Naval Architecture & Ocean Engineering Hydrodynamics, Wuhan 430074, China;
4.State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China. |
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Abstract The interaction between the propeller-shafting system and the fluid around the propeller may significantly affect the dynamic performance of the propulsion system. The traditional methods for investigating this phenomenon are based on the uncoupled fluid-propeller (elastic vibration)/fluid-propeller (six degrees rigid body oscillation)-shafting models, which consider the elasticities of the blades and shaft separately. Since the propeller is attached to the elastic shafting system, the elastic behavior of the shafting system may affect the incoming flows. In addition, previous uncoupled analyses pertaining to this problem were based on the interface conditions of the fluid and the structure, which are imposed on the undeformed blade surface. It is difficult to capture the dynamic behavior of the fluid on the physical surface of the vibrating blades. The vibration characteristics of the propeller-shafting system cannot be accurately predicted by this method. Based on the boundary condition on the fluid-structure interface of the vibrating blades, numerical models are established for two-way strongly coupled fluid-structure interaction analysis of the propeller-shafting system. A stable algorithm of high efficiency and accuracy is developed to study the unsteady hydrodynamic performance of the fluid-propeller-shafting coupled system. It is found that the designers need to consider the elastic coupling effect between the shaft and the propeller for re-evaluation of additional mass/damping and excitation forces at bearings. The developed methods and the results may provide effective theoretical reference and technical support for the design and evaluation of the vibration characteristics of low-speed underwater vehicles.
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Received: 31 October 2022
Published: 28 October 2023
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