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| Multi-field and multi-scale coupling nonlinear vibration characteristics of hydraulic riser in deep sea mining |
| WANG Pucheng1, 2, GUO Xiaoqiang1, LIU Jun3, LUO Jie3, ZENG Linlin3, HE Yufa4 |
1.School of Machanical Engineering, Hebei University of Technology, Tianjin 300401, China;
2.Advanced Millimeter Wave Technology Research Institute, University of Electronic Science and Technology of China, Chengdu 611700, China;
3.School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;
4.State Key Laboratory of Natural Gas Hydrates, CNOOC Research Institute Co., Ltd., Beijing 100028, China |
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Abstract Aiming at the problem of flow induced vibration failure of deep-sea hydraulic mining riser, a nonlinear vibration model of deep-sea mining riser under multi field and multi-scale coupling action is established by using finite element method, Hamiltonian variation and virtual work principle. Wake oscillator model is used to simulate the nonlinear fluid force of external flow of deep-sea mining riser with large length diameter ratio. The longitudinal-transverse coupling effect, external ocean vortex induced effect and internal flow-induced vibration effect are considered. The validity of the model is verified by comparing the theoretical calculation results with the measured data of the simulation experiment. The research shows that, considering the nonlinear factors such as longitudinal-transverse coupling, vortex induced vibration and large deformation, the cross flow (CF), in-line (IL) and longitudinal direction vibration of the mining riser have highly nonlinear characteristics. With the increase of the quality of the intermediate silo, the downstream offset and root-mean-square (RMS) stress of the mining riser decrease, and the axial force on the top of the mining riser increase. Small-period and large-value w0aves have obvious effects on the vibration, stress and axial force at the top of the mining riser.
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Received: 08 October 2021
Published: 15 June 2023
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