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<p>The wet friction clutch in aviation, serving as a central hub in the helicopter transmission system, involves a friction pair composed of mating steel plates and friction discs. Under high power and high-speed operating conditions, these components rub against each other, generating a significant amount of heat, which leads to a high propensity for warping deformation and thermal failure of the friction pair. Based on the principles of heat generation and heat transfer, the thermal flux density and heat source distribution coefficient of the friction pair were calculated. The convective heat transfer calculation methods for rectangular oil grooves and concentric circular grooves, as well as the friction pair’s annular surface and contact surface, were derived. A thermo-mechanical coupled model for the wet friction clutch with multiple friction pairs was established in ABAQUS, revealing the distribution and temporal variation of the temperature and stress fields during engagement. Transient temperature measurement experiments were conducted on the MM6000 test rig to validate the model, and the results obtained, including the trend of temperature rise and peak temperature during engagement, were found to be consistent with the ABAQUS simulation calculations. The maximum temperature difference between the simulation temperature and the test temperature is 7.86 °C, and the maximum temperature difference percentage is 4.37 %.</p>

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Transient thermal characteristic analysis and experimental validation of aviation wet friction clutch

  • 期刊论文

  • 发表日期：

    2025年4月2日

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  • Zezong Huang,
  • Heyun Bao,
  • Yexin Xiao,
  • Yanan Wei

摘要

The wet friction clutch in aviation, serving as a central hub in the helicopter transmission system, involves a friction pair composed of mating steel plates and friction discs. Under high power and high-speed operating conditions, these components rub against each other, generating a significant amount of heat, which leads to a high propensity for warping deformation and thermal failure of the friction pair. Based on the principles of heat generation and heat transfer, the thermal flux density and heat source distribution coefficient of the friction pair were calculated. The convective heat transfer calculation methods for rectangular oil grooves and concentric circular grooves, as well as the friction pair’s annular surface and contact surface, were derived. A thermo-mechanical coupled model for the wet friction clutch with multiple friction pairs was established in ABAQUS, revealing the distribution and temporal variation of the temperature and stress fields during engagement. Transient temperature measurement experiments were conducted on the MM6000 test rig to validate the model, and the results obtained, including the trend of temperature rise and peak temperature during engagement, were found to be consistent with the ABAQUS simulation calculations. The maximum temperature difference between the simulation temperature and the test temperature is 7.86 °C, and the maximum temperature difference percentage is 4.37 %.