Research On Wind Turbine Gearbox Failure Prediction Method

The wind power planetary gearbox is the most widely used transmission system in the field of wind power generation,which can be used in the heavy load environment from low-speed to high-speed.According to the analysis of wind turbine planetary gearbox fault prediction,the overall idea of wind turbine planetary fault prediction based on the fault model is determined.After analyzing a variety of failure models,it is considered that the failure form accompanying the entire life cycle of the gearbox when the wear failure occurs.When the gearbox enters a state of severe wear at a later stage,the overall life of the gearbox cannot be further extended,so the gearbox analyzes the prediction of gear wear failure.Firstly,since the gearbox has a lubrication system,which has an impact on the gear tooth surface wear and gear dynamics,it is necessary to consider that the presence of oil film under mixed lubrication conditions.Oil film has a very significant effect on the gear dynamics,and the mixed lubrication state of the gear.The gear stiffness under the mixed lubrication is analyzed.Secondly,according to the characteristics of planetary gear meshing,the mixed lubrication model of internal and external meshing of planetary gears is modeled,and the torsional vibration dynamic model of planetary gearbox is established.These modls considers the effect of gear stiffness excitation and external load excitation.The time-varying meshing stiffness of the gear under mixed lubrication conditions is calculated,and the time-varying input speed and torque of the wind power planetary gearbox are obtained through the simulation of Balded software.The dynamic meshing force distribution of the gear tooth surface under variable load and timevarying meshing stiffness is solved.Finally,combined with the adhesive wear model,the gear tooth surface wear amount distribution and meshing dynamic performance degradation trend are obtained.The calculation results show that the planet-inner ring gear has a greater load,the oil film rigidity is greater,and the planetary-internal gear meshing comprehensive curvature radius continues to increase,so that the gear oil film rigidity in the exit section will still further increase,making the exit section The gear meshing stiffness will be improved to a certain extent,increasing the gear impact;tooth surface wear has a greater impact on the sun-planet meshing process,which will greatly aggravate the tooth surface impact,resulting in deterioration of gear meshing conditions.