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<p>The engine power is transmitted to the tail rotor via the tail drive shaft system without redundancy. Characterized by complex structure, long shafts, and intricate vibration behaviors, excessive vibration-induced failure may lead to uncontrolled drivetrain dynamics, severely compromising flight safety. This study incorporates internal excitations of spiral bevel gears in intermediate and tail reducers. A 162-degree-of-freedom (DOF) dynamic model is established using hybrid finite element and lumped-mass modeling techniques, discretizing the system into shaft segment unit, gear unit, and bearing-casing unit. The nonlinear dynamics are solved through combined Newmark-β and conjugate gradient methods, yielding nodal shaft trajectories and vibration accelerations. Experimental validation on reducer test benches demonstrates a maximum 14.01% deviation between simulations and measurements, confirming model validity.</p>

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Hybrid dynamic modeling and characteristic analysis of helicopter tail drive systems

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Jiayi Ren,
  • Sunquan Mao,
  • Wenbin Pan,
  • Fengxia Lu

摘要

The engine power is transmitted to the tail rotor via the tail drive shaft system without redundancy. Characterized by complex structure, long shafts, and intricate vibration behaviors, excessive vibration-induced failure may lead to uncontrolled drivetrain dynamics, severely compromising flight safety. This study incorporates internal excitations of spiral bevel gears in intermediate and tail reducers. A 162-degree-of-freedom (DOF) dynamic model is established using hybrid finite element and lumped-mass modeling techniques, discretizing the system into shaft segment unit, gear unit, and bearing-casing unit. The nonlinear dynamics are solved through combined Newmark-β and conjugate gradient methods, yielding nodal shaft trajectories and vibration accelerations. Experimental validation on reducer test benches demonstrates a maximum 14.01% deviation between simulations and measurements, confirming model validity.