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As an important component of aero-engine, the performance of aero-accessory transmission system directly affects the normal operation of aero-engine and even the whole aircraft. However, the gear transmission system and accessory casing are often studied separately, ignoring the coupling characteristics between them and the influence of casing on the system nonlinear dynamic characteristics under the action of complex load spectrum. Therefore, based on the generalized finite element method, this paper divides the accessory transmission system into several coupling sub-elements, and introduces the excitations of backlash, time-varying meshing stiffness, transmission error and torque fluctuation, and establishes the bending-torsion-axis coupling dynamic equations of each sub-element by combining lumped parameter method. Then the substructure method is used to extract the dynamic structural parameters of casing, and the casing-foundation element and the bearing element formed by the coupling of casing and bearing are formed, then the nonlinear dynamic equation of the whole system is assembled according to the coupling relationship. The influence of casing flexibility in different working conditions on the system vibration characteristics under complex load spectrum is studied. Finally, the effects of input speed on the system dynamic characteristics under complex load spectrum are studied. The research shows that the flexibility of casing has greater influence on the operational performance of bevel than helical gear pair, and the meshing dynamic load of each gear pair will suddenly increase at the sudden change of load. The vibration acceleration of casing has a nonlinear relationship with load and input speed. At high speed, the flexibility of the casing can eliminate the superposition of multiple periodic motion and chaotic motion, which makes the system in a single periodic motion. The related results have important theoretical support and practical value for the vibration demping design of an aero-engine accessory transmission system.,

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Research on Dynamic Characteristics of an Aero-Engine Accessory Transmission System

  • 会议论文

  • 发表日期：

    2026年

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  • Zhibin Li,
  • Linlin Liu,
  • Jinde Zheng,
  • Sanmin Wang

摘要

As an important component of aero-engine, the performance of aero-accessory transmission system directly affects the normal operation of aero-engine and even the whole aircraft. However, the gear transmission system and accessory casing are often studied separately, ignoring the coupling characteristics between them and the influence of casing on the system nonlinear dynamic characteristics under the action of complex load spectrum. Therefore, based on the generalized finite element method, this paper divides the accessory transmission system into several coupling sub-elements, and introduces the excitations of backlash, time-varying meshing stiffness, transmission error and torque fluctuation, and establishes the bending-torsion-axis coupling dynamic equations of each sub-element by combining lumped parameter method. Then the substructure method is used to extract the dynamic structural parameters of casing, and the casing-foundation element and the bearing element formed by the coupling of casing and bearing are formed, then the nonlinear dynamic equation of the whole system is assembled according to the coupling relationship. The influence of casing flexibility in different working conditions on the system vibration characteristics under complex load spectrum is studied. Finally, the effects of input speed on the system dynamic characteristics under complex load spectrum are studied. The research shows that the flexibility of casing has greater influence on the operational performance of bevel than helical gear pair, and the meshing dynamic load of each gear pair will suddenly increase at the sudden change of load. The vibration acceleration of casing has a nonlinear relationship with load and input speed. At high speed, the flexibility of the casing can eliminate the superposition of multiple periodic motion and chaotic motion, which makes the system in a single periodic motion. The related results have important theoretical support and practical value for the vibration demping design of an aero-engine accessory transmission system.,