The subsea suspended manifold designed to replace the traditional foundation structure with the buoys is a new gen- eration subsea production system that can be suspended at a certain height from the seafloor and rapidly recycled by its own buoyancy. Due to complex environmental conditions, its hydrodynamic performance in the splash zone is extremely important for the safety of the whole installation process. In this paper, the mathematical model for the dynamic analysis of the seawater ingress process of the single-layer pre-set horizontal cabin is proposed based on the different center of gravity positions of the buoy. Meanwhile, the theoretical analysis of fiber cable is divided into infinite differential units by the discretization method, and the formulae of the horizontal displacement of the subsea suspended manifold are presented. In addition, the simulations are carried out to verify the rules of the dynamic responses on the subsea suspended manifold system with the consideration of the environmental conditions in the South China Sea. Comparing with the calculated value of the mathematical model of the cabin water ingress, the error of the simulation result by use of FLUENT is about 5.47％. Furthermore, the wave height is greater than the current impact on the lowering manifold system and the azimuth angle of the installation vessel is aligned with the direction of the environmental load.

College of Safety and Ocean Engineering, China University of Petroleum-Beijing, Beijing 102249, China;Deepwater Drilling and Production Technology Company, CNOOC Energy Technology & Service Limited,Zhanjiang 524057, China;China Vessel Scientific Research Center, Wuxi 214028, China

[1]WANG Ying-ying;YANG Chao;YANG Zhong-shan;ZHAO Xiao-yu;YIN Jian-xi;HU Yang-dong-.Dynamic Analysis of A Subsea Suspended Manifold Going Through Splash Zone During Installation)[J].中国海洋工程（英文版）,2022(04):553-564

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