Research On Fault Diagnosis Of Gearbox In Wind Turbine

In recent years,with the large-scale development of wind power generation technology in my country,the total installed capacity of wind power has been greatly increased.The gearbox is the key component of the wind turbine.The structure of the gearbox is complex and the working environment is harsh,so the probability of failure of the gearbox is high.And when the fault occurs,because of environmental interference and other factors,it is difficult to find in routine inspection and maintenance.Therefore,it is of great significance to study the fault characteristic information of the wind turbine gearbox in order to ensure the steady operation of the wind turbine and enhance the generating capacity.Based on this background,this paper takes the wind turbine gearbox as the research object,and studies the dynamic model of the wind turbine gearbox and the fault feature identification method according to the structural characteristics and fault types of the gearbox,in order to improve the accuracy of fault feature identification.The main conclusions of the study are as follows:(1)The structural characteristics and working principle of the gearboxes of the firstlevel planetary-level-second-parallel and the second-level planet-level-parallel wind turbines are analyzed.The calculation method of the characteristic frequency of the wind power gearbox is given when the different components are out of order.The fault feature extraction method based on vibration signal analysis is classified and sorted,and the vibration evaluation method adopted by the wind turbine in this study and the installation and selection of sensors in the vibration signal acquisition are determined.(2)The signal processing methods of traditional time domain method,traditional frequency domain method,short-time Fourier transform and Wigner-Ville transform are used to accurately identify the fault types that generate fault signals in the actual field.On the one hand,the feasibility of the traditional time domain method,frequency domain method and time-frequency domain method in the fault diagnosis of wind turbines is clarified.On the other hand,the advantages and disadvantages of several methods are fully compared.A feasible method for fault diagnosis of Wind Turbine Gearbox is summarized.(3)According to the structure of the gearbox of the wind turbine,the threedimensional modeling software of SolidWorks is used to construct the gearbox structure model under the normal state of the first-level planet and the second-level parallelism and the broken tooth fault state,respectively including the kinematics.model and dynamic model.The research results show that the fault diagnosis results obtained from the analysis of the actual fault signal data in the field are in good agreement with the fault diagnosis results obtained from the simulation analysis of the constructed model,thus verifying the reliability and accuracy of the model.In addition,the calculation of meshing force and frequency between gears is carried out by using ADAMS,and the corresponding and mutual verification of kinematics and dynamics are realized.