| Float-over topsides installation has become a cost-effective alternative for offshore construction over the past25-30years, as ever-increasing topsides weight constantly exceeds the lifting capacity of floating cranes. Floatover installation method is widely used in foreign countries, especially in the Middle East. Float-over topsides installation is the trend of the development of offshore installation. This paper investigated the floatover installation process on a jacket with numerical and experimental analysis.Based on numerical calculation software AQWA, this paper studied the barge’s hydrodynamic properties such as the added mass, damping coefficient, wave force and the motion RAO in different water depth and draft ratio, the barge dynamic response in same depth, different directions. and the barge natural periods in vertical planes. Nonlinear time-domain coupling numerical method is adopted, calculated two stages of3.8mPre-Mating (barge entry and docking) and4.4m Load Transfer0%(topside and jacket mating),0°45°90°135°and180°five wave direction, illustrated the fender load effect from various wave direction, various wave heights, nd analysised the barge motion in heave and roll direction.On the other hand, the model test is used for the floatover installation of topside and barge. Using the method of model experiment, analysise the results of model test and numerical simulation, such as, the maximum fender load and the key points heave motion. It is significant to design ocean structures with excellent dynamic performance. The numerical simulation and model test could correctly forecast the hull and platform dynamic performance. and promote the shipping and Marine engineering development. The present paper aims at giving the Naval Architect a few elements enabling him to promote the investigation and development of the floatover. |
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