柔性支承下風(fēng)力機傳動系統(tǒng)動態(tài)特性及軸承疲勞壽命分析
[Abstract]:In all parts of the world, large-scale wind turbine power generation has gradually become the main form of wind energy conversion, and the demand and production of wind turbines have continued to increase. With the increase of energy demand and environmental protection in China, the demand and dependence on mature wind power technology is increasing. At present, compared with advanced wind power technology abroad, there is still a big gap between us and the demand of wind power industry in China. With the increase of the height of large wind turbine foundation support structure, the influence of supporting structure flexibility on the system also increases. Under the action of random wind load, the supporting structure produces elastic deformation, which affects the gearbox transmission system from the machine to the cabin, causes the coupling movement of its internal components, and makes the dynamic load of the system worse. The dynamic response of the system changes with it. The actual service life of the wind turbine is much lower than its design life in 20 years under the influence of the high flexibility of the foundation and the great change of the instantaneous load. It is shown that the traditional design method and concept of wind turbine drive system under rigid support are insufficient in analyzing the dynamic characteristics and reliability of the system. Therefore, the flexible support of tower, the dynamic characteristics of large wind turbine transmission system under random wind load and fatigue life of key components are studied in order to improve the performance of wind turbine gearbox. It is of great significance to solve the bottleneck problems such as the life of wind turbine, and has certain reference value for the study of dynamics and reliability analysis of wind turbine transmission system in China. In this paper, the influence of tower flexible support and random wind load on large wind turbine is considered, and the dynamic coupling model of wind turbine gearbox transmission system is established, and the internal excitation such as time-varying meshing stiffness and meshing error are considered. The dynamic response of gearbox transmission system under flexible support is solved. On this basis, the dynamic meshing force of each gear pair and the dynamic load of the low-speed shaft bearing are calculated, and the static analysis of the bearing is carried out. The results show that the contact stress at the outer corner of the contact region between the rolling body and the inner ring is the largest, and the bearing stress spectrum is obtained by combining the quasi-static analysis method and the mathematical statistics theory. The fatigue life of low speed shaft bearing is estimated based on Miner linear cumulative damage rule. The results are valuable for wind turbine dynamic analysis, fault maintenance arrangement and reliability design.
【學(xué)位授予單位】:太原科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TM315
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