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Zhejiang Machinery and Electrical Group

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Simulation of wind turbine main shaft strength based on meshless method
Published:2023-11-27 author:NIE Xinyu, WANG Xiaofang, LIU Yong, et al. Browse: 211 Check PDF documents
Simulation of wind turbine main shaft strength based on meshless method

NIE Xinyu1,2,3, WANG Xiaofang1,2, LIU Yong1,2, BAI Conger1,2, SUN Zhejie1,2, XIA Guojun1,2

(1.Zhejiang Windey Co., Ltd., Hangzhou 310012, China; 
2.Key Laboratory of Wind Power Technology of Zhejiang Province, 
Hangzhou 310012, China; 
3.College of Energy Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract:  The finite element analysis of the main shaft strength of wind turbines has complex and time-consuming problems. In order to improve the design efficiency of the main shaft which is a key component for transmitting load in wind turbines, the calculation reliability of the meshless method on the main shaft assembly and its advantages in modeling process and calculation time were analyzed using the main shaft structures of single SRB and double TRB models as examples. A main shaft structure design method that utilizes the meshless method to improve iteration efficiency was proposed. Firstly, taking two types of main shaft assembly structures containing double row self-aligning roller bearing (SRB) or single row tapered roller bearings (TRB) as objects, finite element models based on simplified bearings through link elements were established. Then, based on external finite element approximation theory, boundary conditions and contact relationships suitable for 3D prototypes were established, and research of the modeling process of meshless simulation method was conducted. Finally, the deformations and concentrated stresses of the two types of main shaft structures under four typical ultimate load conditions were calculated and analyzed respectively. Comparing with the recognized finite element strength analysis method in the industry, the applicability and effectiveness of the meshless simulation method for wind turbine main shaft structures were validated. The results show that the relative errors of the maximum displacements of the whole structures between finite element models and meshless simulation models are within -6.06%~2.28%, and the relative errors of concentrated stresses of the two types of main shafts are respectively within -2.36%~2.94% and -6.71%~4.76%, indicating good agreement. While ensuring the accuracy of the stiffness and stress, the meshless simulation modeling process is much easier, and the calculation time is reduced significantly, which can improve the design efficiency of the main shaft effectively.

Key words: wind turbine; mechanical strength; main shaft design efficiency; finite element strength analysis; meshless method; SimSolid

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