WIND POWER GEAR BOX ORDER TRACKING METHOD BASED ON MESHING FREQUENCY AND SPECTRUM CORRECTION TECHNOLOGY

摘要

Disclosed is a wind power gear box order tracking method based on a meshing frequency and spectrum correction technology. The method comprises performing discrete sampling on vibration acceleration signals on the surface of a box body of a fan planet gear box to obtain a non-stationary time domain sequence x_n(t) firstly; adding a hanning window w (t) to intercept a section of x n(t) and performing FFT transformation to obtain a power spectrum G(f); performing frequency correction on the meshing frequency f_m of a gear box high-speed shaft in the G(f) by a four-point energy centrobaric correction method to obtain an instantaneous meshing frequency expressed by the formula(I); moving window functions in turn and extracting the formula(I) by the energy centrobaric method repeatedly to obtain a meshing frequency curve expressed by the formula(II); obtaining a high-speed shaft rotating frequency curve according to the relation between the meshing frequency and the rotating frequency, wherein the high-speed shaft rotating frequency curve is expressed by the formula(III); combining with the formula(III) to performing equal-angle resampling on the x_n(t) to obtain a smooth angle domain sequence θ _n(t); and performing correction on the order time and the amplitude by a window length moving method and the energy centrobaric method to obtain an order tracking curves O_i(t). The solution is good in generality, high in anti-noise performance and accurate and reliable and the problems that a method for measuring the fan rotating speed through a tachometer is difficult in installation, high in cost, poor in accuracy and the like can be avoided.