Static Analysis Of SeaStar Tension Leg Basis For Offshore Wind Power Generation

The contradiction between the depletion of fossil resources and the increasing demand for production and life is more and more intense,Wind energy as a kind of clean energy whose development and utilization received widely attention.Among them,the offshore wind energy has more advantage than the land wind energy.Fixed offshore wind turbines have been unable to apply the requirements of deepwater.Floating marine fans are mostly steel structure,while its high cost,high maintenance costs and other issues are highlighted.Therefore,the construction and design of float-ing fan foundation of good mechanical properties and good economy needs to be ad-dressed.SeaStar tension leg basis as the second generation of tension legs basis is devel-oped on the basis of the traditional tension leg basis,It low construction cost is low,it exercise performance is good,it can effectively resist the environmental load,and adapt to the deep water environment.However,the relevant research history of this basis is less than 30 years,so its structure type,movement performance and force characteristics need to be further studied.In this paper,the new SeaStar tension leg basis conducted the following research:Firstly,the engineering background of the SeaStar tension leg basis is introduced.Based on the finite element theory,the 3D finite element model is established by us-ing the finite element software ABAQUS.The geometrical dimensions of the basis,the constitutive model and the interaction between the unit body,the connector and the cable,the type of unit selected,the combination of various loads and the boundary conditions are introduced.Secondly,after the static analysis of the complete structure and the damaged structure of the tension leg basis at 0° wind direction,The causes of the stress in the weak region are analyzed,Adverse effects of cable failure on the force and displace-ment of the tension leg basis.According to the law,increases the cross-sectional thickness of the stress-concentrated area caused by bending,for the shear force caused by excessive stress concentration area set support,for the smaller stress area to reduce the thickness of the cross-section.After the structure optimization,the static analysis of the same load combination is carried out on the tension leg basis,Thi’s optimization method makes the basis have better mechanical properties.Then,in order to explore the influence of wind direction,wind direction angle changes every 15°,and the most unfavorable wind direction angle and the distribution of stress and displacement of various winds are obtained.Finally,on the basis of the above chapters,the strength control conditions under the extreme loads such as earthquakes and storms are obtained,and the stress design value’s of the cables are satisfied.The in-plane displacement of the basis satisfie’s the specification requirements,The law of the buoyant reinforcement design,making the strength of the basis to meet the requirements.Therefore,the reinforced structure of SeaStar tension leg basis which has good mechanical properties,sports performance and economy is suitable for its promotion.The research results of this paper provide a theoretical basis for the design and con-struction of the SeaStar tension leg basis.