T-shaped launching barge HYSY229 is applied to transport the LW3-1 jacket from Qingdao to South China Sea, which is the largest one in Asia up to now. Two tugs are used for the dry-towing. Because the shape of this barge hull is a little special, it is interesting to investigate the motion responses during the transportation. Meanwhile, real-time motion monitoring is very necessary and important for the owner from the view point of the safety of the dry-towing process. Signals of pitch, roll and accelerations of six degree motions of the barge are monitored during the transportation. The measurements lasted 29 days starting from 27th July to 25th August in 2012. The maximum peak-peak value recorded for roll and pitch motions is 1.64 and 2.38 degrees respectively, which is smaller than the threshold of design value. Moses code is adopted to predict the 1/3 roll and pitch motions of the barge. Results of numerical simulation and motion monitoring are compared in short term sea state using the environmental parameters observed. Fair well agreements are achieved.

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