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Investigating the flow-field characteristics of gears under various lubrication conditions, a fluid-solid multi-body dynamic model considering the coupling effect between lubricant and gear was established. Traditional models mainly consider lubrication effects by introducing a constant friction coefficient, making it difficult to accurately reflect the gear’s actual operating conditions under mixed lubrication. Therefore, to address the complexity of aircraft engine accessory gear conditions and insufficient studies on lubrication simulation, this study obtained oil pressures in the meshing region through flow-field simulations and integrated these data into a multi-body dynamic model, accounting for lubricant-induced impacts and loads during meshing, to examine the effects of lubrication conditions on dynamic responses. The results indicate that lubrication intensifies meshing force fluctuations, oil pressure increases with rotational speed, and vibration acceleration amplitudes become more pronounced under harsher operational conditions. Specifically, spray lubrication produces greater impacts on gears, whereas oil-churning lubrication is more significantly influenced by operational conditions.

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Analysis of Dynamic Response of Aeroengine Accessory Gear Systems Considering Lubrication-Induced Excitation Based on Fluid-Solid Coupled

  • 会议论文

  • 发表日期：

    2026年

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  • Hao Xu,
  • Yingqiang Xu,
  • Youwei Liu,
  • Li Xiao

摘要

Investigating the flow-field characteristics of gears under various lubrication conditions, a fluid-solid multi-body dynamic model considering the coupling effect between lubricant and gear was established. Traditional models mainly consider lubrication effects by introducing a constant friction coefficient, making it difficult to accurately reflect the gear’s actual operating conditions under mixed lubrication. Therefore, to address the complexity of aircraft engine accessory gear conditions and insufficient studies on lubrication simulation, this study obtained oil pressures in the meshing region through flow-field simulations and integrated these data into a multi-body dynamic model, accounting for lubricant-induced impacts and loads during meshing, to examine the effects of lubrication conditions on dynamic responses. The results indicate that lubrication intensifies meshing force fluctuations, oil pressure increases with rotational speed, and vibration acceleration amplitudes become more pronounced under harsher operational conditions. Specifically, spray lubrication produces greater impacts on gears, whereas oil-churning lubrication is more significantly influenced by operational conditions.