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Effects of Flexibility and Suspension co.figuration of Main Shaft on Dynamic Characteristics of Wind Turbine Drivetrain

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Chinese Journal of Mechanical Engineering 2019年第2期32卷 224-238页

作者： Jianjun Tan Caichao Zhu Chaosheng Song Huali Han Yao Li The State Key Laboratory of Mechanical Transmissions Chongqing University csic (Chongqing) haizhuang windpower Equipment co. Ltd

The current research of wind turbine drivetrain is mainly co.centrated in dynamic characteristics of gearbox with a specific suspension of main shaft, such as one-point and two-point suspension. However, little attention is paid to the e ects of these suspension co.figurations on the dynamic responses of wind turbine gearbox. This paper investigates the influences of suspension co.figurations of main shaft on the dynamic characteristics of drivetrain. For evaluating the dynamic behaviors of drivetrain with multi-stage transmission system more realistically, a dynamic modeling approach of drivetrain is proposed based on Timoshenko beam theory and Lagrange's equation. co.sidering the flexibility and di erent suspension co.figurations of main shaft, time-varying mesh sti ness excitation, time-varying transmission error excitation and gravity excitation, etc., a three-dimensional dynamic model of drivetrain is developed, and the dynamic responses of drivetrain are investigated. Results show that with the one-point suspension of main shaft, the resonance frequencies in gearbox, especially at the low-speed stage, obviously shift to the higher frequency range co.pared to the gearbox without main shaft, but this trend co.ld be inversed by increasing main shaft length. Meanwhile, the loads in main shaft, main shaft bearing and carrier bearing are greatly sensitive to the main shaft length. Hence, the load sharing is further disrupted by main shaft, but this e ect co.ld be alleviated by larger load torque. co.paring to the one-point suspension of main shaft, there occurs the obvious load reduction at the low-speed stage with two-point suspension of main shaft. However, those advantages greatly depend on the distance between two main bearings, and co.e at the expense of increased load in upwind main shaft unit and the co.responding main bearing. Finally, a wind field test is co.ducted to verify the proposed drivetrain model. This study develops a numerical model of drivetrain

关键词： Wind turbine drivetrain Flexible shafts Suspension co.figuration Dynamic responses Experimental study

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Effects of elastic support on the dynamic behaviors of the wind turbine drive train

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Frontiers of Mechanical Engineering 2017年第3期12卷 348-356页

作者： Shuaishuai WANG Caichao ZHU Chaosheng SONG Huali HAN The State Key Laboratory of Mechanical Transmissions Chongqing University Chongqing 400030 China csic (Chongqing) haizhuang windpower Equipment co. Ltd.Chongqing 401122 China

The reliability and service life of wind turbines are influenced by the co.plex loading applied on the hub, especially amidst a poor external wind environment. A three-point elastic support, which includes the main bearing and two torque arms, was co.sidered in this study. Based on the flexibilities of the planet carrier and the housing, a co.pled dynamic model was developed for a wind turbine drive train. Then, the dynamic behaviors of the drive train for different elastic support parameters were co.puted and analyzed. Frequency response functions were used to examine how different elastic support parameters influence the dynamic behaviors of the drive train. Results showed that the elastic support parameters co.siderably influenced the dynamic behaviors of the wind turbine drive train. A large support stiffness of the torque arms decreased the dynamic response of the planet carrier and the main bearing, whereas a large support stiffness of the main bearing decreased the dynamic response of planet carrier while increasing that of the main bearing. The findings of this study provide the foundation for optimizing the elastic support stiffness of the wind turbine drive train.

关键词： wind turbine drive train elastic support,dynamic behavior frequency response function

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A Review of Research Status and Scientific Problems of Floating Offshore Wind Turbines

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Energy Engineering 2022年第1期119卷 123-143页

作者： Zhen Lei Xinbao Wang Shuni Zhou Zekun Wang Tengyuan Wang Yingjian Yang China State Shipbuilding co. Ltd.Beijing100097China Institute of Engineering Thermophysics Chinese Academy of ScienceBeijing100190China csic haizhuang windpower co. Ltd.Chongqing401122China

With the co.tinuous utilization of offshore wind resources,the installation depth and capacity of offshore wind turbines are *** order to meet co.struction requirements of renewable energy,offshore wind farms are bound to develop further and deeper into the *** a result,a novel kind of power generation equipment,Floating Offshore Wind Turbines(FOWT),emerges as the times ***,this paper provides an objective co.ment on some key scientific ***,The statistics and forecast of the market demand and installed capacity of offshore wind energy show a steady *** that,the advantages of co.structing FOWT and most floating projects in various co.ntries are *** then,the reco.struction design of blades is reviewed under“Reynolds number”and“Froude number”similarity criterion,which is a prerequisite for achieving specific aerodynamic *** far,this paper focuses on aerodynamic researches,including aerodynamic forces and flow *** this basis,pitch angle co.trol strategies are proposed to reduce aerodynamic forces on the premise of ensuring power ***,some other joint science problems to be solved are *** theoretical analysis,numerical simulations,ocean engineering basin tests,wind tunnel experiments or prototype sea measurements,FOWT is expected to break through various obstacles and finally achieve efficient and stable co.mercial operations.

关键词： FOWT scale effect motion response load co.trol

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