Abstract: To analysis of 4 semi-submersible drilling platform hydrodynamic performance providing a comprehensive guidance for system selection. The 1:1 3D wet surface model is established by ANSYS and numerical simulation is carried out based on the dynamic analysis software AQWA. Simulation results show that longitudinal waves impact the surge, heaving and pitching motion a lot, beam seas have large effects on the sway, heave, roll motion vertical heave response increases significantly, as will as surge, sway, heave damping coefficient of vector direction and the added mass coefficient of algebraic. We can not only increase the number of columns to improve platform strength and stiffness. The type 2 platform has better hydrodynamic performance, which is a reference for designing.

Key words: AQWA, emi-submersible drilling platform, frequency domain analysis, hydrodynamic properties, damping coefficient, additional quality