Algorithmic Research And Type Selection Design Of Key Basic Components Of Wind Turbine Spindle Drive Chain

With the exhaustion of non-renewable energy,the use of clean energy has been supported by the government.Among them,the wind turbine as a kind of clean energy generation device is developing rapidly.In recent years,with the "industrial strong foundation project" in "China made 2025",basic theory research on basic core components has become the development direction of national key support.wind turbine shrink disk and main bearing are the key components of the spindle drive system of wind turbine,whose performance directly affects the normal operation of wind turbine.In this paper,the two components will be taken as the research object,and the algorithm optimization of multi-layer interference fit and the selection of main bearings will be studied.Equivalent wind turbine shrink disk to multi-layer interference cylinder.Based on the single layer interference fit theory,the matrix expression of interference and contact pressure in the multi-layer interference fit is derived.Based on the theory of multi-layer interference fit,the influence of centrifugal effect and temperature gradient on the interference amount is considered,and the matrix expressions of contact pressure and interference amount of multilayer interference fit under the coupling of multiple factors are derived.Through the finite element software-ABAQUS,the effect of centrifugal effect and temperature gradient on interference amount was explored,which further verified the accuracy of the function expression.The results show that under the two factors,except for a large stress concentration at both ends of the interface,the analytical solution is basically in agreement with the numerical solution.For bearing type selection and design research,bearing type and bearing arrangement are evaluated to determine the bearing type.The fatigue load and ultimate load at the hub are calculated by using the GH-Bladed,and the annual operating conditions of the wind turbine are statistical.The equivalent fatigue load is obtained by dealing with the fatigue load,and the spindle bearing load is solved by force balance equation.Finally,the bearing type selection is carried out to form a complete calculation system of spindle bearing type selection of wind turbine.The three-dimensional model of the selected bearing is established by finite element software,and the static strength is checked according to the ultimate load of the bearing.The results show that the stress distribution of the bearing agrees with bearing contact theory,and the maximum contact stress of the bearing is less than the yield strength of the bearing material.So,the bearing will not undergo plastic deformation during its service.Finally,the bearing fatigue performance analysis is carried out.Firstly,the fatigue failure mode of spindle bearing of wind turbine is analyzed,and the contact surface of inner ring is determined to be the most prone area to fatigue failure.Maximum contact stress of interface between inner ring and roller is calculated under each working condition.The S-N curve of bearing parts is obtained by using the S-N curve correction of bearing materials.Combining with Miner's linear cumulative damage theory,the cyclic life and failure life of bearing inner ring under various working conditions are obtained,and the total damage value of the bearing is finally calculated.The results show that the bearing will not suffer from fatigue damage and can meet the design requirements of 20 years.