Research on Multi-field Coupling Multiple Nonlinear Vibration Model and Fatigue Failure Mechanism of Deep-sea Mining Hydraulic Riser

doi:10.3901/JME.2025.14.321

Abstract

Abstract: Aiming at the failure problem by flow induced vibration of deep-sea hydraulic mining lifting pipe, a multiple nonlinear vibration model of deep-sea hydraulic mining lifting pipe under multi-field coupling is established by using finite element method and Hamilton variational principle. The model not only considers the multi-field coupling effect between ocean flow field, lifting pipe stress field and internal flow field, but also considers the vertical and horizontal coupling nonlinearity of lifting pipe, vortex induced nonlinearity of ocean load and flow induced nonlinearity of internal flow field, which is numerically solved. The correctness of the model is verified by comparing the calculation results of the theoretical model with the test results of the simulation experiment. Meanwhile, a nonlinear fatigue damage prediction method for riser considering the effect of load interaction and residual strength degradation is established by the Corten-Dolan cumulative damage theory. On this basis, the influence of external velocity, intermediate bin mass, internal velocity and wave parameters on riser fatigue life is explored. It is found that the fatigue life of lifting pipe decreases first and then increases with the increase of external flow velocity, and the external flow velocity with the largest fatigue life appears. However, the current velocity cannot be controlled in reality. Therefore, according to a certain external flow velocity, the established analysis method is used to evaluate the optimal structure parameter settings. With the increase of the intermediate bin mass, the fatigue life of the mining lifting pipe decreases first and then increases. There is an optimal intermediate bin mass configuration parameter on site, which is related to lifting pipe structure and internal and external velocity, and can be determined by the fatigue prediction method established. With the increase of internal lifting speed, the fatigue life of lifting pipe increases first and then decreases, and the optimal lifting speed is 4 m/s. The research results provide an analysis tool for the design of deep-sea mining operation parameters.

Key words: string mechanics, deep-sea mining, multi field coupling, multiple nonlinear vibration model, fatigue failure mechanism

CLC Number:

TE38

GUO Xiaoqiang, Lü Junlin, LIANG Hao, LI Xiao, HU Ning, LIU Jun, GUO Shoujin. Research on Multi-field Coupling Multiple Nonlinear Vibration Model and Fatigue Failure Mechanism of Deep-sea Mining Hydraulic Riser[J]. Journal of Mechanical Engineering, 2025, 61(14): 321-335.

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