Comparison and analysis of dynamic effect for mooring system of semi-submerged platform in deep water

As the operation depth of semi-submerged platform extends to deep water,the taut mooring system is applied widely.Dynamic behavior of the mooring system is impostant in calculating the response of the platform.The main difficulty in solving the problem is that no closed-form solution is available for the dynamic equations of motion of mooring line;in addition,the presence of quadratic hydrodynamic drag complicates the analysis further.The basic character of the taut mooring system is presented in this paper.The platform′s motion and dynamic effect of mooring lines with catenary mooring and those with taut mooring are compared.The relationship between drag coefficient and dynamic effect of mooring lines is also studied.The results show that the motion behavior of the points on catenary mooring line is different from taut mooring line.The conclusion in the paper can be used for improving the dynamic behavior of the mooring system.