The floating crane vessel can be applied to install the offshore topside module of the platform during the lifting operations. If the motions of the topside are large due to the severe ocean environments, the topside will frequently collide with the jacket structures, which will threaten the safety of lifting operations. As the coupled motions are not easy to be predicted accurately due to the complex coupling system, including the waves, the mooring system, the crane vessel, the crane sling and the topside, model tests are carried out to study the motions of the mooring vessel LANJING during lifting operations.The model tests are carried out in the port and coastal basin of Tianjin University. The model scale is set to 1:60. Motions of LANJING and the topside, tension forces of the 8 mooring lines and waves are measured in regular and irregular waves. The coupled motions with resonance phenomena are clearly observed and the physical mechanism is revealed. The obtained experimental results can be used to validate the numerical results, and thus ensure the safety of lifting operations.
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