| The research subject of the thesis stems from the National Natural Science Foundation Project “Research on load sharing mechanism and configuration of super high power wind power gearbox with multi planet gear and flexible pin”(51405048).Planetary transmission system has many advantages,such as compact structure,small mass,strong bearing capacity,high energy density,high transmission efficiency and large transmission ratio.The planetary gear system,as an important part of transmission,is developing towards megawatt power,and the load of the planet gear is increasing.Whether the load is evenly distributed in the planetary gear system will directly affect the working stability and working life of the planetary gear system.Therefore,the study of the load sharing performance of planetary gear system under different influence factors has great theoretical significance and practical engineering value.In this thesis,based on the principles of gear meshing,tooth contact analysis,tribology,heat transfer theory and non-linear dynamics of the system,theoretical analysis and finite element method is used to analyze the load sharing performance of the high-power planetary gear system under the influence of different factors,such as position error,supporting stiffness,input load,the deformation of system components and so on,further,the results verified by tests.The major content is as follows:(1)Considering the friction and heat effects existing in the planetary gear system,the influence mode of the meshing phase,the friction moment and the mesh stiffness on the system is determined.A dynamics analysis model of planetary gear system is established on the basis of the above factors.Further,the solution of dynamic model is studied.(2)Through the model,parameter of the planetary gear system is identified,and the heat flow and heat from the tooth surface which generated by friction and obtained the heat distribution of the tooth surface is extracted.The influence of gear thermal deformation on gear mesh stiffness and extracted the mesh stiffness of gear after thermal deformation is studied.(3)Under the action of flexible components,analysis of the load sharing performance of planetary gear system is completed.The changeable trend of system load sharing performance with different system parameters and operation parameters is obtained after analyzing the influence of factors such as error,support stiffness of floating component,external load and thermal deformation on the load sharing performance of the planetary gear transmission system with flexible components.Based on load sharing performance of the system,the parameter matching,such as sensitivity of system load sharing capacity to different floating forms,are carried out in this thesis.The changeable trend of the system load sharing performance with the number of planet gears is obtained by comparing different load sharing performance of planetary gear system caused by different number of planet gears under same system parameters and operation parameters,.(4)The test is developed for load sharing performance of the flexible supporting planetary gear system.The influence of the change of operation parameters on load sharing performance is discussed under the error impacts of the planetary gear system on a megawatt gearbox test-bed.After that,the theoretical result is validated. |
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