Dynamics Modeling and Analysis of Seafloor Drill Hard Landing

doi:10.3901/JME.2023.23.146

Abstract

Abstract: In order to achieve a safe landing for seafloor drill at the underwater deployment stage, a hard-landing dynamic model is established for a deep-sea drilling rig with three supporting-legs. The model has 7-DOF, which are the plane motion of the main-body and the space motion of the footpad, and it elaborates the contact force between footpad and sediment by considering repeated dynamic loading in normal direction and introducing modified friction coefficient in tangential direction, builds the axial force of struts based on equivalent spring damping method, surely considers the friction resistance and hydrodynamic force between drilling rig and seawater simultaneously. Based on above model, the numerical simulation analysis of the hard-landing process of the "Seabull Ⅱ" seafloor drill is carried out, the results show that during hard landing, the maximum deflection angle of the drill’s main-body does not exceed 1 °, the maximum sinking depth of the footpad is about 0.19 m, the maximum axial force on the struts’ hydraulic cylinder is 714.9 kN, which is about 12 times of the static axial load of the strut under the dead weight of the drill, and the maximum resultant acceleration of the center of mass of the main-body is 53.6 m/s² (about 5.5g). To sum up, all dynamic responses are within the design allowable range, so the seafloor drill can achieve safe and reliable landing under the setted working conditions.

Key words: seafloor drill, hard landing, dynamics, deep-sea sediment

CLC Number:

TH122

LIU Peng, JIN Yongping, LIU Deshun, WAN Buyan. Dynamics Modeling and Analysis of Seafloor Drill Hard Landing[J]. Journal of Mechanical Engineering, 2023, 59(23): 146-157.

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