Study of lifting operation of a tripod foundation for offshore wind turbine

[摘要] This study addresses numerical analysis of the installation of a tripod foundation using a heavy lift vessel (HLV). Limiting sea states are firstly predicted in the frequency domain based on crane tip vertical motions using linear transfer functions. Then, numerical modelling and simulations are carried out in the time domain to analyse the coupled dynamic system taking into consideration of the nonlinearities of the system. In time-domain analysis, two lifting phases are brought into focus, i.e., the lift-off and the lowering phases. For the lift-off phase, two scenarios are considered, i.e., lift-off from the own deck of the HLV and lift-off from a transport barge. Moreover, comparative studies using two types of installation vessels, a floating vessel and a Jack-up, are investigated for the lowering process. Critical responses including the motions of the tripod and the lift wire tensions are presented and compared under various environmental and loading conditions.

[发布机构] Department of Mechanical and Structural Engineering and Materials Science, University of Stavanger, Stavanger, Norway^1

[学科分类] 计算机科学（综合）

[关键词] Comparative studies;Coupled dynamic systems;Frequency domains;Heavy lift vessels;Installation vessels;Linear transfer function;Modelling and simulations;Tripod foundations