Research on the Dynamic Characteristics of Wind Turbine Gear System with Dynamic Conditions Induced Dynamic Response-Lubrication State Coupling

doi:10.3901/JME.260466

Abstract

Abstract: The strong time-varying working condition excitation under random wind loads on gear transmission system of wind turbine leads to the switching of the lubrication state between gear teeth and affects the dynamic parameters，and the final dynamic response. Existing studies have overlooked the significant changes in gear dynamic parameters under different lubrication states and the resulting changes in meshing dynamic characteristics，as well as the complex coupling behavior that feeds back to the lubrication state，affecting the accuracy of dynamic analysis. A multi-degree-of-freedom dynamic differential equation group for the translational-torsional coupling of the wind turbine gear transmission system is firstly established，and the expression of the dynamic oil film thickness between gear teeth to determine the lubrication state of the meshing pair is derived. Then，the key dynamic parameters such as contact stiffness，damping coefficient，and friction coefficient under different lubrication states are modeled. Subsequently，the real-time relative elastic deformation of the meshing pair is solved to update the dynamic oil film thickness，forming an iteration. Based on this dynamic response-lubrication state coupling model，the dynamic characteristics and lubrication characteristics of the wind turbine gear system are analyzed. The research shows that compared with constant working conditions，time-varying working conditions significantly increase the amplitude of the meshing pair and the frequency of lubrication state switching. Compared with the meshing of the sun gear and planet gear，the meshing of the high-speed helical gear is less affected by time-varying working conditions. The surface roughness of the gear teeth also plays a role. When the roughness increases，the meshing pair is more likely to enter the boundary lubrication state，and causes the vibration amplitude to increase. The research results can provide a theoretical basis for the condition detection and fault diagnosis of the wind turbine transmission chain.

Key words: wind turbine gear, lubrication state, time-varying operating conditions, dynamic response, dynamic model

CLC Number:

TH113

YU Xin, SHEN Zihan, SUN Yunyun, WU Shijing, LIU Sheng. Research on the Dynamic Characteristics of Wind Turbine Gear System with Dynamic Conditions Induced Dynamic Response-Lubrication State Coupling[J]. Journal of Mechanical Engineering, 2026, 62(12): 33-46.

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