Load Characterization and Fatigue Reliability Prediction of Large Aerospace Planetary Gear

The reliability level of large aviation planetary mechanisms, serving as the cornerstone and essential component for various heavy aircraft transmission systems, significantly impacts aircraft affordability and service safety. Before predicting the fatigue performance of the gear transmission system, it is necessary to develop a comprehensive simulation model of the gear system and calculate the stress values for failure modes such as tooth contact fatigue and tooth root bending fatigue. In addition, By using hierarchical finite element technology, the coupling effect of the global elastic behavior of the system on the fatigue load history of the gear teeth is analyzed in depth, and accurate calculations are carried out based on this to fit the probability fatigue strength of the gear teeth. This provides both economical and efficient load and strength input variables for the construction of the system reliability prediction model, and innovatively establishes a new series system reliability model. Finally, the computational findings from the new model is contrasted with the traditional one to show the superiority of the proposed model.