| Compared to other energy, the biggest advantage of wind energy is renewable and with few pollution. As a kind of clean energy, it has large-scale development prospects and commercial development prospects. The ocean area accounts for more than 70% of the surface area of the earth. Not only the space is wilder for building wind farms on the sea, but the wind power and the wind energy density is larger. The wind energy has higher efficiency and more stability, therefore has greater potential for development. Offshore wind power generation technology is a comprehensive technology, involved multiple subjects of variety of fields. Developing from the low-power wind turbine to the high-power wind turbine and from the shallow water to deep water are the key to obtain economy energy. Building the supporting structure adapted to the trend of offshore wind turbines (OWTs) is one of the main technology of the offshore wind energy development. To reduce costs and improve reliability is the key point of the development and research.According to the engineering characteristics of the stationary OWTs supporting structure, this paper does some research. The research is based on the related domestic and foreign research results, study on the dynamic characteristics and optimization technology of the OWTs tripod structure.Compared to the monopole structure, tripod has better stiffness. Tripod structure can effectively reduce the diameter of the pile and the difficulty of construction. It is more conducive to the stability and anti-fatigue properties, also more suitable for the construction ability of Chinese construction equipment. So it can be used for the deeper waters, the specific contents are as follows:Using ANSYS,a finite element program, the optimum simulation platforms of tripod support structures of OWTs are developed by parametric language and build finite element model of tripod support structure described in the main kinetic parameters. The mechanical property of the soft-stiff support structure are greatly improved, so the stress and deformation of the soft-soft support structure are greatly improved, and the structure materials usage is similar. In contrast, the soft-soft support structure has larger deformation and less safety, though the stiff-stiff support structure is not economic. And give out the adaptation of a tripod support structure with a 5MW wind turbine with hub height of 100m in different water depth (10m-50m) through a numerical optimization example.● The tripod support structure with a 5.0MW wind turbine with 100m hub height has good applicability for different water depth. However, due to the complexity of the social economic and biophysical systems, economic or environmental choice is not necessarily the best. Therefore, in the decision-making process, Application of multi-objective decision analysis method to considering the conflicting attributes at the same time, and to provide the best option. The TOPSIS method was applied to the comprehensive decision on the OWT support structure. Considering engineering and environmental standards at the same time, and provides a better objective evaluation method on the choice of the different supporting structures.● Make Comparative analysis of performance optimization of monopile and lattice support structures by examples., build the relationship between the wind dynamic characteristics and the main scale of the structure. Combining the TOPSIS, an Ordinal preference method which is Close to the ideal solution in the multi-criteria decision, evaluate internal connection between the security property, economic property, environment property and the water depth. |
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