Finite Element Analysis And Structural Optimization Of Large-Scale Wind Turbines Hub

With the wind turbine installed capacity increasing, it suffered more and more complex load, the security issues of wind turbine and its component parts become particularly outstanding. To ensure that wind turbines can operate normally within its design life, the key components of wind turbine should be design and its strength should be check, the structure of the corresponding parts should also be optimizated on this basis.Hub is one of important component parts of wind turbine, its structure is relatively complex and bears variable aerodynamic loads. The normal operation of the wind turbine will be affected directly by the design quality of hub, it is difficult to simulate its stress value and distribution accurately by using classical mechanics, it also brought a lot of inconveniences for design work.Therefore, the finite element method is introducted within the strain and stress analysis of hub in this paper, and the hub of wind turbine SUT-3000 model is meshed regularly and conveniently into hexahedral element with finite element analysis software Hypermesh, stress status analysis of hub is finished by using MSC.Patran/Nastran as analysis platform.Ultimately the stress distribution state of the whole hub can be gained, and a more accurate stress and deformation of hub can be obtained as well as related nephogram, the most dangerous parts of the hub can be found directly, providing a reliably design basis for the hub. The results of strength analysis show that the maximum stress value 56.1 MPa of hub less than allowable stress, the maximum deformation value is 2.75mm, both meet the design requirements.The partial structure of hub is optimizated based on the ultimate strength analysis. Based on the optimization results which are given by optimization software, combined with practical experience in the design, the SUT-3000 hub is re-modeled and analysised for its strength, its analysis results still meet the design requirements, the purpose of reducing its weight and manufacturing costs is also reached. This article provides more reasonable scientific basis for analysis and self-design of large power wind turbine hub, development time is shorten and the design cost is saved. The important theoretical significance and engineering value can be proveded for enterprises as well as the security problems of hub can be solved, it establishs a solid foundation for independent intellectual property right of domestic wind turbine.