Assembly simulation and testing of dual TRB main bearings for large wind turbines
During the operation of wind turbines,there is often a problem where the preload of the shaft system can not reach the design value due to inadequate installation.A transmission system model of a certain MW wind turbine was established,and simulation analysis was carried out for the assembly process of the main bearing.Firstly,the axial movement of the shaft system caused by the interference fit between the bearing rings and related structures,and the influence of the bearing seat on the preload under vertical installation status were studied.Then,the preload generated by the shaft system under different clamping amounts and operating temperatures was compared and analyzed.Finally,displacement testing was carried out during the assembly process of the main bearing at room temperature to measure the relative displacement of the inner and outer rings of the front bearing from the fitting of the front bearing to the locking process of the compression cover.The research results show that the axial displacement of the shaft system is directly proportional to the interference of the bearing ring.The gravity of the bearing seat in a vertical installation state can cause a certain degree of preloading of the main bearing.The preload during bearing operation is positively correlated with the temperature difference between the inner and outer rings during bearing operation,and is independent of the average temperature of the shaft system.The error between the measured results and the simulation values is 5.3%,it verifies the accuracy of the finite element simulation method and the reliability of installation.
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