Multibody coupled dynamic response analysis of a dual barge float-over operation system with motion compensation equipment under a passive operational mode

The classic dual barge float-over technology has limited applications in marine operations due to its high complexity and risk of integrated system transporting and load transferring procedures. To improve its operational feasibility, a novel dual barge float-over concept and technology with motion compensation equipment (MCE) are studied. Because MCE changes the connection properties between the structures, the dynamic behavior of the new Operational becomes difficult to predict. A multibody coupled hydrodynamic and dynamic numerical model of the operation system is developed in the present study. The MCE is modeled as a spring and damper under a passive operational mode. The hydrodynamic interactions are analyzed using a frequency-domain approach, and the effects of the equipped MCE and resonant fluids on multibody motions and contact forces based on time-domain simulations are investigated. The results indicate that MCE could lead to relatively large yaw motions of the topside structures in quartering waves and roll motions in beam waves. Moreover, the resonant fluid motions significantly affect the horizontal contact forces of the MCE. The developed numerical model can capture the dynamic behavior of the novel operation system in detail, and the analyzed results provide initial knowledge for MCE design.