| Since the attention of wind as a new energy source causing the rapid development ofoffshore wind farm, the wind farm installation is always a key issue when building anoffshore wind farm. Although the research of wind farm installation vessel has acquired someresults, with the expansion of the sea area which used to explore wind energy and complexityof marine environment, a single form of wind farm installation vessel has been unable to meetthe need of practical engineering. Under this grim situation, it is necessary for us to do thefurther research and exploration on the new ship. This paper will study a new form wind farminstallation vessel which has the function of self-propelled transport ship, bottom supportedplatform and crane ship. Through this research, the author wishes to make a contribution toour country’s wind power industry.In this paper, the wind farm installation vessel’s movement in floating crane condition isanalyzed in the frequency domain and time domain. The frequency domain model is builtbased on the software AQWA, and provides detailed analysis of the vessel’s hydrodynamicperformance. The hydrodynamic database will supply the input date for the time-domaincoupling analysis. The time domain model is built based on the same software，and themooring system of model is also designed. Then, the coupling effect of mooring system andcable-payload assembly on the wind farm vessel are analyzed under various sea conditions.Meanwhile, the reasonableness of the mooring system is verified.The precept research on the lying on the seabed condition is made based on AQWA. Theultimate precept for the lying on the seabed condition is given and the model is also built. Thelateral wave loads of vessel based on the former model and breakwater theory are calculated,through comparing the two results, the reliability of calculating the wave load with the AQWAsoftware is verified. Based on the validate，the vertical storm flow load under various seacondition is calculated and provided scientific basis for researching the anti-adsorptionproperties.The adsorption force of bottom supported structure is studied based on the finite elementmethod. Firstly, the bottom supported model is built based on the ANSYS. Secondly, theeffect rule of different parameters on the limits lifting power is analyzed，then the effects ruleon the adsorption force is obtained. The third, the immersion depth of the bottom supported structure is studied and the ultimate precept for the immersion depth calculation is given.Finally, taking one of the areas where vessels operate as an example, the author studiedthe anti-adsorption properties. Based on the findings above, the adsorption force of theexample is calculated, and then combing with the installation of the ship’s ballast and verticalwave loads calculated above, the calculation of anti-adsorption properties is made. The aidmeasures when breaking away from the seabed and the research method of floating stabilityare also given.The findings of this paper will offer a good reference value to the forecast of wind farminstallation vessel’s motion, and it is important and significant for forecasting the storm flowloads of the bottom supported structure. |
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