Time-Domain Simulation of Lowering Operation Dynamics of a Mudmat
Aiming at the problem of cable tension and structure motion response during the lowering operation of mudmat,a time-domain simulation model was established by discretizing mudmat,subsea distribution units and mani-folds into cylinder elements.The range of the dangerous lifting state of the mudmat was determined according to the results of the cable tensions from lowering operations in regular waves.Further,the dynamic responses of the cable tensions were analyzed via the slamming of irregular waves under different hoisting states,and the most dangerous state was determined.The rules of dynamic amplification factor in slings and the hydrodynamic load at the most dan-gerous state for irregular waves in the time and frequency domain were analyzed.The results show that there is the most dangerous state when the steel mudmat skirts immersed about 0.2 m,and the dynamic response of the ropes is the largest at this time;In the most dangerous state,the dynamic response of the cable tension is more likely to be af-fected by the wave height,and the dynamic amplification factor of the sub-slings is smaller than that of the main rope,so sub-slings are most likely to slack.
NETL
NSTL
万方数据
维普
