| Due to the abundance and the increasing maturity of technology, offshore wind power has the potential of large scale development and is one of the most valuable commercial utilization of renewable energy. It can transport four 6MW engine through the integrate installation of offshore turbine. Up the deck, it has the lifting device and can realize the installation of the integrate turbine. Compared with the traditional installation method, it saving time and can improve work efficiency by integral installation of wind turbine, which reduces the working time and simplifies the process.Due to the big size of 6MW engine, the truss which can fix and lift turbine engine must be designed. In integral installation design,the cooperation of the ship and truss design is needed.Meanwhile,with the rising size of offshore turbine,the huge size of operation truss is required,which contributes to the increase of the gravity center of truss as well as the ship.As a result the stability of the ship is also reduced. So the design of the operation truss should not only satisfy the requirement of turbine operation, but also make little change in the main dimensions of meet the demand of stability under the circumstance of making little change in the main dimensions.(1) According to the special requirements and working characteristics of offshore integrated transportation and installation, the integrated transportation and lifting operation scheme is designed. What is more, the overall design of lifting device is conducted.The basic parameters of hoisting mechanism are given. The lifting device and lifting trolley is designed.The preliminary calculation of main components in lifting device and lifting trolley is conducted.(2) According to the preliminary calculation, suspended lifting trolley is designed.Moreover, according to the operation requirements of offshore turbine, service condition of suspended lifting trolley is analyzed.The FEM model of suspended lifting trolley is established by finite element analysis software——ANSYS,The structure strength is analyzed by ANSYS.The stress and displacement are obtained.Last, the structural improvement is conducted, which the weight is reduced by 45.6%.(3) Through the analysis of the transportation and lifting condition of offshore wind turbine,the truss that can fix and lift turbines is designed.Cooperated with loading cases of truss,the FEM model of the truss is established by ANSYS and the maximum stress and maximum displacement under different working conditions are calculated.The results showthat the maximum stress of the truss is less than the allowable stress of the material, the strength of the truss is satisfied with rules.According to the result,some suggestions of integration operating of the wind turbine lifting devices are given.(4) At last, the size of the truss structure is optimized by using the advanced application technology of ANSYS.Then the optimal scheme of the truss structure is obtained.The strength and stiffness of the truss are analyzed, and the results show that on the premise of guarantee the strength and stiffness, the weight of the truss is reduced by 8%,as well as the manufacturing cost.The stability of vessel is improved, which is satisfying. |
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