关键词: 航空起动电机, 转轴寿命, 随机振动, Workbench

Abstract: Aiming at the safety of the structural life of the rotor shaft of the aerospace starter motor, a starter motor with a rated speed of 6 000 r / min was taken as the object of study, and the effects of the eccentricity of the shaft end mounting and random vibration on the fatigue life of the rotor shaft were investigated based on the multi-physical field simulation platform of Ansys Workbench. The effects of hole diameter, hole position and chamfer radius on the life of the shear section of the rotor shaft were analysed, and optimization measures to improve the life of the shear section of the rotor shaft were given in terms of structure, material and process. Based on the special characteristics of the operating environment of the
aerospace starter motor, the life under random vibration load was analysed in combination with the linear fatigue accumulation theory. The reliability of the simulation results was verified by building a test platform. When the coupling and spline connection were eccentric, the rotor shaft breaks at 4 356 load starts, and the simulated fracture trend of the rotor shaft’ s shear section life was basically the same as that of the experiment, which was a reference for the design of rotor shafts of the same type of products.

Key words: aviation starter motor, shaft life, random vibration, workbench