Simulation And Characteristics Analysis Of Misalignment Fault Of Double Fed Wind Turbine Transmission System

In recent years, wind power industry develops rapidly all over the world, while the installed capacity of wind turbine has been increasing quickly. The condition monitoring technology and fault diagnosis technology of wind turbine has become a new industry hot spot followed. And the misalignment fault is one of common faults of the double-fed wind turbine transmission system, which would cause the vibration of equipment, wearing of bearing and bending deformation of shaft. The misalignment fault is very harmful to the operation stability of the wind turbine. So the research on the misalignment fault of double-fed wind turbine transmission system has a very important engineering significance.This research relies on "fault mechanism and diagnosis technology of coaxial degree error of double-fed wind turbine" which is supported by the National Natural Science Foundation of China (51577008). The double-fed wind turbine transmission system is used as the research object, the structure characteristics of which is going to be analyzed. And the virtual prototyping is used to modeling and dynamics simulation to find the response characteristic of the transmission system misalignment fault.The structure and the key motion characteristics of the gear box first, the coupling and the generator are analyzed firstly to determine the gear mesh frequency and contact force of coupling and other important parameters. The frequency response characteristic of parallel-misalignment and angle-misalignment is calculated.Secondly, the three-dimensional model of the transmission system is established by using SolidWorks based on the structural parameters of the transmission system. And the material, constraints, contact force, and drive parameters are going to be added to the model after the 3D model was imported to Adams so that the prototyping model could be built. Motion simulation is carried out, and the key features will be extracted to prove correctness of the model.Then the parallel-misalignment and the angle-misalignment are added to the model in Adams and the dynamic simulation is conducted respectively. The time domain and frequency domain characteristics of the acceleration and the force are extracted in the Post-processor, and compared with the normal model, the frequency doubling vibration response characteristics are analyzed.In the end, the wavelets are used to decompose the results in Matlab to deeply study the impact of misalignment. The change rule of kurtosis is obtained, which provides reference for the detection and diagnosis of the misalignment of double-fed wind turbine transmission system.