Dynamic Calculation And Gear Fault Analysis Of Gearbox Transmission System Of Wind Turbine

To study the influence on the transmission and characteristics of the vibration signal when the composite fault, Collection and analysis of experimental signal on transmission system of wind turbine gears. The vibration signal of planetary gear transmission is difficult to extract, the multi-body dynamics model and the rigid dynamic model are established to study vibration signal of the gear fault.First, the main gear fault vibration signals in the time domain and frequency domain were analyzed on the basic of theoretical, and introducing the calculation method of fault characteristic frequency of gear.The finite element model of wind turbine gear transmission was established to analyze its low-order natural frequencies and the corresponding modes, mastering resonant frequency range and the corresponding modes of vibration. It provides guidance for the arrangement of measuring point.In test signal, the frequency band near the high-speed level 2 octave is high when the fixed axis high speed driving wheel engages have single failure. When it have complex fault, the speed class mesh frequency double appeared near a high amplitude band and its octave above the basic mesh frequency and fault characteristics in the low frequency region planets are complex, which unable to distinguish. Thus, a multi-body dynamics model of wind turbine gear transmission is established by ADAMS. Analyzing the analog signal in qualitative that the influence of the fixed axis gear fault are clear and the distribution of the frequency domain are consistent. The resault is that the high-speed meshing frequency and medium-level engagement and 2 octave frequency band is strong. When it have composite fault, the effect of planetary gear wheel off nearby sources of error are obvious and the planetary gear mesh frequency and amplitude of 2,3 multiplier are obvious. The side frequency near the mesh frequency and its harmonics are obvious. The fault gear have weak influence on the other position.In the test signal, meshing frequency doubler magnitude are higher than the basic mesh frequency. So that the dynamic model of rigid coupling of the fan drive system were established by ADAMS and ANSYS. To analyze causes that enhancing speed grade mesh frequency amplitude and the feature of planetary wheel failure. Studying the characteristics of planetary gear broken teeth, fixed axis high speed capstan crack-planetary gear teeth broken complex fault, it is good for fault analysis. It draw that broken teeth have obvious impact on the speed gear meshing and resulting in second harmonic amplitudes speed grade mesh frequency enhancement, The magnitude of the planetary gear mesh frequency is high and the multiplier are higher than its engagement. When it has composite failure, the fault gear of given the shaft speed result in enhancing of the frequency band 2 octave amplitude near enhanced.