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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
P.C:
310009
E-mail:
meem_contribute@163.com
Abstract: With the development of large-scale wind turbines, the accuracy of strength check of yaw brake discs of wind turbines is becoming more and more strict. Therefore, it is urgent to adopt a more realistic finite element method to check the strength of yaw brake discs.Aiming at the problem that the binding contact algorithm was difficult to obtain the actual force state of yaw brake disc, taking yaw brake disc of a MW wind turbine as the research object,the ultimate strength check, fatigue strength check and comparative calculation were carried out. Firstly, based on GL specification, the node degrees of freedom(DOF)coupling method was used to simulate the actual force state of the yaw brake disc, the ultimate strength of the yaw brake disc in the whole working condition was calculated and the minimum ultimate safety factor was obtained. Then, the unit fatigue condition of yaw brake disc was calculated, the relationship between load and stress was obtained, and the fatigue strength was evaluated by using fatigue analysis software Fe-Safe combined with fatigue load spectrum and S-N curve of plate. Finally, the calculation results were compared with those obtained by binding contact algorithm for yaw brake disc.The results show that the safety factors of ultimate strength and fatigue strength of yaw brake disc are greater than 1, which meet the strength requirements. Moreover, the method of coupling node degrees of freedom can effectively control the load transfer in a certain direction, and more truly simulate the force state of yaw brake disc, which proves the rationality of the result.
Key words: ultimate strength; fatigue strength; mechanical strength; node degrees of freedom(DOF)coupling; binding contact algorithm; contrast calculation; fatigue load spectrum
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