| Citation: | XU Hao, XU Yingqiang, GE Changchuang, et al. Dynamic modeling analysis of multiple excitations in aeroengine accessory systems[J]. Journal of Aerospace Power, 2025, 40（8）：20230408 doi: 10.13224/j.cnki.jasp.20230408
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Considering an aero-engine accessory transmission gear system, the multi-excitation (mesh stiffness excitation, error excitation and friction excitation) dynamic modeling analysis under different working conditions was carried out. By introducing the position angle and displacement projection vector, and using the idea of finite element matrix assembly, a 51-degree-of-freedom dynamic model of a certain type of aero-engine accessory gear transmission system was established; using the potential energy analysis method, the meshing stiffness excitation characterization of alternating single and double teeth was completed. The random function was employed to complete the meshing error excitation characterization, and a friction excitation characterization method was established based on the elastohydrodynamic lubrication model; the variable step size Runge-Kutta method was used to solve the dynamic response of the transmission system, and the dynamic characteristics of the transmission system were analyzed by various internal and external excitations. The results showed that the coupling effect of high speed and low stiffness increased the risk of instantaneous overload, tooth surface detachment and fatigue damage between gear pairs; lubrication conditions, precision grades and gear structures had a greater impact on system dynamics; the gear was the most dangerous, and its vibration margin should be paid attention to. This could provide a basis for the follow-up dynamics research of the central transmission system.
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