A Random Numerical Simulation Method for Launch and Recovery System of Seafloor Drill

doi:10.3901/JME.2018.23.112

Abstract

Abstract: A new random numerical simulation method for evaluating dynamic response characteristics of a launch and recovery system is presented, which takes random irregular wave as input, and the random distribution characteristics of dynamic response of launch and recovery system is analyzed by using rain-flow counting method, and the dynamic laws of the launch and recovery system under different water depths and sea state are obtained. A launch and recovery system of a seafloor drill is chosen as a demonstration, the nonlinear coupling mechanism among the movement of the ship, the umbilical cable, and the seafloor drill caused by random irregular wave are investigated, and the dynamic model that considers the influence of the seawater resistance for launch & recovery system of seafloor drill is established. Based on the dynamic model of launch and recovery system of seafloor drill, the significant wave heights are used to produce excitation of the random irregular wave, and the corresponding dynamic random responses of the launch and recovery system are calculated and analyzed. The pendulum angle and the heaving motion of the seafloor drill and the tension of the umbilical cable are calculated and analyzed for the cases of seafloor drill at different water depths and sea state. The method provides a new tool for the dynamic characteristics of launch and recovery system of other seafloor equipment.

Key words: dynamical characteristics, launch and recovery system, random irregular wave, seafloor drill, statistical analysis

CLC Number:

TH122

JIN Yongping, WAN Buyan, LIU Deshun, PENG Youduo, GUO Yong. A Random Numerical Simulation Method for Launch and Recovery System of Seafloor Drill[J]. Journal of Mechanical Engineering, 2018, 54(23): 112-120.

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