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- Title
Influence of oil film stiffness on natural characteristics of single-rotor three-input helicopter main gearbox.
- Authors
Yuan Chen; Ru Peng Zhu; Zai Chun Feng; Guang Hu Jin; Wei Zhang
- Abstract
The elastohydrodynamic lubrication (EHL) contact model is established, the oil film stiffness is calculated based on Dowson-Higginson empirical minimum thickness equation. The vibration model of single-rotor three-input helicopter main reducer is proposed by lumped mass method, and nonlinear factors like oil film stiffness, dynamic meshing force are taken into account. The influence of oil film stiffness on system natural frequency is analyzed as well. The results show that oil film stiffness of the internal and external meshing pairs in the planetary gear system have greater impact on the natural frequency, which tends to destabilize the system. Therefore, the planetary gear train is the most crucial branch regarding the system splash lubrication. When all the oil film stiffness in the system are greater than 4x109 N/m, the natural frequencies tend to be stable. This study can provide the theoretical reference for the lubrication characteristics in the single-rotor multi-input helicopter.
- Subjects
THIN films; ELASTOHYDRODYNAMIC lubrication; ROTORS; THICKNESS measurement; STIFFNESS (Engineering); NONLINEAR dynamical systems
- Publication
Vibroengineering Procedia, 2018, Vol 17, p7
- ISSN
2345-0533
- Publication type
Article
- DOI
10.21595/vp.2018.19707