Abstract: Aiming at the problem of fatigue life prediction for elastic support of wind turbine gearbox,  the numerical simulation technology was applied to rubber fatigue calculation. The elastic support finite element model was established by using rubber model parameters, static stiffness test was carried out, the simulation results were in good agreement with the experiments. The fatigue damage model was selected, the fatigue life of rubber material was tested, then the model parameters were determined. Fatigue damage analysis of elastic support of gearbox under design load of wind turbine was carried out, a fatigue analysis method for rubber under multiaxle variable load condition was proposed. The time series loading of fatigue load was transformed into displacement time series loading, the time series fatigue damage and equivalent fatigue damage were calculated, the distribution of fatigue damage in different parts of elastic support was obtained. The results indicate that the fatigue damage of rubber under the time series fatigue load is greater than that under equivalent fatigue load, the actual fatigue check should be carried out according to the time series fatigue load.
Key words: elastic support; rubber; finite element (FE); fatigue life; multiaxial load