Research on offshore megawatt wind turbine wheel lifting equipment
The wind turbine hoisting device is an important device for hoisting wind turbines in wind turbines.Due to the limited connection surface of the wind turbine hoisting device by the wheel hub structure,the safety factor of the connecting bolts of the wind turbine hoisting device is usually difficult to meet the design requirements under alternating load lifting conditions.Therefore,it is necessary to optimize the hoisting device structure and increase the safety factor of the connecting bolts of the hoisting device.Taking the wind wheel lifting device of a certain MW wind turbine as an example,a three-dimensional software was used to parameterize the modeling of the lifting device.The finite element method was used to numerically analyze the lifting and docking conditions of the wind wheel lifting device.A calculation method for connecting bolts of lifting equipment based on beam body was proposed.By studying the thickness of the main board of the lifting device,the position of the rib plate,the bolt specifications,and the bolt pretension parameters,the strength of the wind wheel lifting device and the bolt were calculated,and the lifting device structure was compared and optimized.The results show that the equivalent stress of the wind turbine lifting device in the docking condition is about 1.2 times that of the lifting condition,and the deformation of the lifting device is half of the lifting condition.Under various test conditions,the maximum equivalent stress and maximum deformation of the wind turbine lifting device occur at the connection of the lifting ear hole of the lifting device.Under various test conditions,the equivalent stress of the connecting bolts of the lifting device fluctuates greatly.After optimization,the maximum equivalent stress of the bolt has been reduced by 20%.The results indicate that for the same lifting conditions,the equivalent stress and deformation fluctuations of the wind turbine lifting device are relatively small.When only calculating the equivalent stress and deformation of the lifting device,the influence of connecting bolts on the equivalent stress of the lifting device can be ignored.The use of upper rib plates,increasing the thickness and bolt specifications of the main board,and appropriately increasing the tensile force of the bolt on the small end of the hub can to some extent reduce the equivalent stress of the lifting bolt.After on-site practical verification,the optimization results are feasible,providing reference and guidance for the subsequent optimization of the lifting device design of the unit.
wind turbineswind wheelfinite element analysisstrength analysis
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