| The energy crisis and the deterioration of the living environment caused by the excessive use of non-renewable energy sources such as fossil fuels have caused governments to pay more and more attention to clean and efficient renewable energy.Speeding up wind power technology research has become a basic consensus and measure for countries around the world to promote the transformation of energy structure and actively respond to global climate governance.The hub is not only an important connecting piece of the wind turbine system of a wind turbine,but also a main bearing component;it not only connects the blades and the motor shaft,but also carries variable aerodynamic loads.The comprehensive performance of the wind turbine hub structure will directly affect the overall normal operation and service life of the unit.Therefore,it is necessary to analyze the strength of the initially designed hub structure to determine its stress and strain distribution under extreme load conditions,and to provide theoretical and data support for the subsequent topology optimization and secondary design of the hub structure.Based on the results of the calculation of the ultimate static strength of the hub,the topology optimization of the hub is carried out to achieve the purpose of reducing the weight of the hub and reducing the casting cost of the hub.The research results of the thesis will provide a set of finite element analysis and topology optimization design schemes for related enterprises and institutions in the subsequent development of wind turbine related equipment,which has engineering practical significance.Based on Germanischer Lloyd(GL)classification society certification specifications and International Electrotechnical Commission(IEC)standards,this paper takes a certain type of wind turbine hub as the research object,and based on the finite element method,systematically and comprehensively aligns the hub The ultimate strength and topology optimization of the research have been carried out.The main contents of this article are as follows:(1)According to the dimensional parameters of a certain type of 3MW horizontal axis wind turbine hub provided by an enterprise,the solid works modeling software is used to establish a three-dimensional solid model of the hub,and part of the structure is simplified without affecting the finite element analysis.deal with.(2)Based on the finite element method,use the analysis modules under the analysis software ANSYSY Workbench to perform pre-processing operations such as meshing the simplified wheel hub model.For a single finite element model of the hub,the main shaft and blade prosthesis are added to be close to the actual operation of the hub.According to the load data of actual operating conditions,the strength of the hub was analyzed,and the distribution of stress and strain of the hub was obtained,which pointed out the direction for the subsequent topology optimization design of the hub.(3)Analyzed the calculation results of the ultimate static strength of the hub,and selected four working conditions of Mx-max,My-max,Mxy-max and Fx-max,used TOSCA software for topology optimization,based on the topology calculation results and design experience The structure of the wheel hub has been redesigned.And again use ANSYS Workbench to check and analyze the ultimate strength of the reconstructed wheel hub model.The results show that the strength and stiffness of the newly designed wheel meet the requirements.(4)The hub is used as a structural connection.In order to prevent resonance with other parts,a modal analysis of the new hub structure is carried out.The results show that the natural frequency of the reconstructed hub avoids the excitation frequency of the wind wheel,and no resonance occurs. |
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