| In the era of vigorously developing new energy,wind power depends on its advanced technology,low cost,high safety factor to become the most commonly used new energy production methods.In order to make full use of new energy sources throughout the country,China in the "13th Five-Year Plan" put forward a lot of wind energy development and utilization of the wind and the establishment of the principle,In 2017 the State Electric Power Investment Corporation's first mountain wind power belt program(Lingqiu County,400,000 kilowatts of wind power heating demonstration projects? Guangxi Xing'an County first and second stage wind farm project? Fujian Jianning Ganjia wind power project,etc.)has also been implemented,while the coastal cities continue to carry out offshore wind power planning,and toward large-scale,high power,deep sea and other trends,is expected to 2020 offshore wind power Development potential of 32 million kilowatts.With the wind farms in the land,the overall construction of the sea,the fan parts of the large volume,heavy quality to the transport installation problems such as trouble also highlights,so the production of light weight,reliable performance of the parts is necessary.In this paper,through the re-selection of the hub and structural design,through the UG to establish the hub model,the use of ANSYS Workbench simulation verification,the main results are as follows:1)According to the actual size of 2MW horizontal axis fan hub,UG is used to build three-dimensional modeling,which is ductile iron,and its finite element analysis is used to obtain stress and strain distribution law,natural frequency and vibration mode.2)According to the principle of parts selection,the ductile iron wheel hub material optimization,and ultimately determine the new wheel of the material for the casting of low alloy steel and redesigned its structure.The finite element analysis of the original model shows that the dangerous part of the hub is in the leaf hole and the part connected with the spindle,and the curved surface of the hub has a lot of room for optimization.Therefore,it is possible to reduce the wall thickness of the dangerous part Parts designed into a hollow structure,to achieve the hub of the lightweight design.3)The design scheme of cast steel wheel was studied.According to the theory of fan design,six new design of the hub was developed.The stress of the new design was tested by ANSYS Workbench finite element analysis software.Regularity and quality reduction.Considering the ratio of the maximum equivalent stress and the quality reduction in the design scheme,the scheme 3 is chosen as the optimal design scheme.4)The dynamic characteristics of the hub are studied,and the natural frequency and vibration modes are obtained by the prestressed modal analysis of the hub.It is found that the natural frequency of cast steel is lower than that of ductile iron but larger than that of impeller The rotational frequency does not resonate at this excitation frequency.5)The fatigue properties of the wheel are studied.The fatigue life analysis results show that the fatigue damage is less than 1 and the life is above 107,which satisfies the service life of 20 years. |
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