Whining Noise And Vibration Analysis As Well As Experimental Analysis Of Speedincrease Gearbox In Wind Power Generator

The wind speed increasing gear box as a key component in the wind power generation equipment, its performance directly determines the normal operation of wind power plant. Because the wind turbine gearbox is in order to adjust the special environment factors and the strong external incentive, it has held on large load fluctuations, high vibration and noise, and other operating characteristics. The dynamic performance of the transmission system, gearbox vibration and noise characteristics and fault signal analysis are promoted in this paper. This has theoretical significance and engineering value for the preliminary design and improving the operation stability of speed-increase gearbox for wind turbine.This research work is supported by National Natural Science Foundation of China, it takes the 1.5MW speed-increase gearbox of wind power generator as research object. The transmission error calculation of each gear pair, simulation of the gear dynamic meshing force, whining noise and vibration simulation, analysis and testing whining noise signal processing are proposed. The main research work of this paper is as follows:(1) The time-varying meshing stiffness and bearing parameters are calculated with the Romax software. The lumped parameter method is utilized to establish the bending torsion coupled vibration dynamics model of the transmission system of the wind power gearbox, combined with the time-varying mesh stiffness, tooth modification, the gear manufacture precision, tooth surface roughness and other factors, the time domain curves for every degree of freedom are solved, the transmission error curve and the gear dynamic meshing force are estimated.(2) With the kinematics module of LMS software, when the nonlinear parameters, which are all levels gear transmission error, mesh damping, backlash and bearing stiffness, damping, are considered, the rigid-flexible coupled model of the speed-increase gearbox for wind turbine with box, bearings, rollers, gears is established to solve the vibration response of the gearbox by using the modal superposition method. Therefore, the response of the box surface and the bearing force can be got; and the acoustic coupling model is built up for the whining noise estimates by using the finite element method.(3) With the static model of the gear transmission system by Romax software and the lumped parameter dynamics model, the dynamic transmission error is analyzed by the different manufacturing precision and gear tooth profile modification. The rigid-flexible coupled model of the speed-increase gearbox is used with the dynamic transmission error, then the bearing dynamic reaction force will be got by solving the coupled model. Then, the vibration and whining noise of the gearbox is calculated. The influence law of the different manufacturing precision and gear tooth profile modification on vibration and whining noise of speed-increase gearbox is studied.(4) Based on the vibration and noise test of the speed-increase gearbox for wind turbine, the vibration signal of the gearbox and the sites acoustic pressure signal can be extracted; and in order to verify the accuracy of the simulation results, the vibration and noise simulation values of the wind speed increasing gear box are compared with the test results. Aim at the measured vibration and noise signals and simulation values, the amplitude spectrum, cepstrum and envelope spectrum are analyzed to confirm the possible fault characteristic frequency of the speed-increase gear box. In addition, the failure location of the speed-increase gear box is analyzed.