Structural Design And Safety Assessment Of Integrated Development System Of Marine Cage And Wind Power

Shandong Province has a vast sea area,unique marine resources,and huge potential for the development of the marine economy.In order to gradually improve the ability of deep sea development,maximize the economic advantages of offshore wind power industry and aquaculture,maximize the utilization rate of the sea,and explore a new mode of integrating the development of offshore wind power and net tank farming,which has important practical significance and application prospects for green low-carbon development and supply-side structural reform.At present,the research on the combination of marine cage and offshore wind turbines all over the world is in its initial stage,and there are no mature related technology reports yet.Drawing on the design and construction methods of marine platforms,combined with the sea conditions of the Yellow Sea,we design an integrated development system of marine fishery and electricity suitable for China’s national conditions and research on its safety to improve the overall independent innovation capability and development level of marine equipment.The main work of this paper includes.1.Large-scale cage scheme design: Taking the installed capacity of 30 MW power generation and 30 m operation water depth as technical indexes,based on the existing 5MW fan size,layout,relevant industry specifications and extreme environmental loads,combined with the existing large cage design experience at home and abroad,the structure,material,mesh size and other characteristics are designed.2.Suction bucket foundation solution design: The design of a set of “one-tow-many”(single foundation,multiple turbines)suction cylinder foundations in a dotted arrangement.Based on the geological conditions of the Yellow Sea,the failure modes of overturning,sliding and instability of the suction cylinder foundation are analysed and the moment balance equations of the individual suction cylinder foundation under different failure modes are established to derive its ultimate load bearing function.The ultimate environmental loads of the upper wind turbine and the central grid box under the action of wind and wave currents are calculated by means of the relevant code theory.On the basis that the ultimate load carrying capacity of the suction barrel foundation is sufficient to resist the ultimate environmental loads of the upper and central structure,the structural dimensions of the suction barrel foundation are designed for different arrangements,taking into account the sensitivity analysis results of the number of foundations,spacing,length to diameter ratio and other influencing parameters in the foundation design process.3.Safety assessment of the integrated marine cage and wind power development system:In view of the preliminary design scheme of the integrated development system of marine fishery and electricity,the finite element models of cage and suction bucket foundation are established with the help of the finite element software ANSYS.The accuracy of the model is verified by comparing the theoretical and software calculation results.The static analysis,modal analysis and transient dynamic analysis results of the model are carried out,and the strength and stiffness of the analysis results are checked according to the design requirements of relevant specifications,so as to ensure the structural safety of the integrated development system of marine fishery and electricity.