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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. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Ａｉｍｉｎｇ ａｔ ｔｈｅ ｐｒｏｂｌｅｍ ｏｆ ｔｈｅ ｗｅｌｄ ｃｒａｃｋｉｎｇ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ｉｎ ＭＷ ｗｉｎｄ ｔｕｒｂｉｎｅꎬ ｔｈｅ ｍｕｌｔｉ￣ｂｏｄｙ ｄｙｎａｍｉｃｓ ａｎａｌｙｓｉｓ ａｎｄ ｔｈｅ ｆｉｎｉｔｅ ｅｌｅｍｅｎｔ ａｎａｌｙｓｉｓ ｔｅｃｈｎｏｌｏｇｉｅｓ ｗｅｒｅ ａｐｐｌｉｅｄ ｔｏ ｔｈｅ ｓｔｒｅｎｇｔｈ ａｎａｌｙｓｉｓ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘꎬ ａｎｄ ｔｈｅｎ ｔｈｅ ｓｔｒｕｃｔｕｒｅ ｏｐｔｉｍｉｚａｔｉｏｎ ａｎｄ ｓｔｒｅｎｇｔｈ ａｓｓｅｓｓ￣ ｍｅｎｔ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ｗｅｒｅ ｃａｒｒｉｅｄ ｏｕｔ. Ｆｉｒｓｔｌｙꎬ ｔｈｅ ｄｙｎａｍｉｃｓ ｍｏｄｅｌｉｎｇ ａｎｄ ｓｉｍｕｌａｔｉｏｎ ａｎａｌｙｓｉｓ ｏｆ ｔｈｅ ａｓｓｅｍｂｌｙ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ｗｅｒｅ ｍａｄｅ ｂｙ ｔｈｅ ｄｙｎａｍｉｃｓ ａｎａｌｙｓｉｓ ｓｏｆｔｗａｒｅ Ｓｉｍｐａｃｋ ｔｏ ｄｅｔｅｒｍｉｎｅ ｔｈｅ ｃｒｉｔｉｃａｌ ｌｏｃａｌｔｉｏｎｓ ｗｈｅｒｅ ｔｈｅ ｖａｒｉａｔｉｏｎ ｏｆ ｔｈｅ ｓｔｒｅｓｓ ａｍｐｌｉｔｕｄｅ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ｗｅｌｄ ｗａｓ ｂｉｇｇｅｓｔ. Ｔｈｅｎ ｔｈｅｓｅ ｌｏｃａｔｉｏｎｓ ｗｅｒｅ ｕｓｅｄ ａｓ ｔｈｅ ｃａｌｃｕｌａｔｉｏｎ ｃｏｎｄｉｔｉｏｎｓ ｏｆ ｔｈｅ ｆｉｎｉｔｅ ｅｌｅｍｅｎｔ ａｎａｌｙｓｉｓꎻ Ｓｅｃｏｎｄｌｙꎬ ｔｈｅ ＦＥ ｍｏｄｅｌ ｉｎｃｌｕｄｉｎｇ ｔｈｅ ｐｉｔｃｈｂｏｘ ａｎｄ ｓｕｐｐｏｒｔ ｗａｓ ｂｕｉｌｔ ａｎｄ ｔｈｅ ｓｔａｔｉｃ ｓｔｒｅｎｇｔｈ ａｎａｌｙｓｉｓ ｗａｓ ｃａｒｒｉｅｄ ｏｕｔ ｂｙ ｔｈｅ ｆｉｎｉｔｅ ｅｌｅｍｅｎｔ ａｎａｌｙｓｉｓ ｓｏｆｔｗａｒｅ ＡＮＳＹＳ. Ａｎｄ ｔｈｅｎ ｔｈｅ ｅｘｔｒａｐｏｌａｔｉｏｎ ｓｔｒｅｓｓｅｓ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ｗｅｌｄｓ ｗｅｒｅ ｃａｌｃｕｌａｔｅｄ ｂｙ ｔｈｅ ｗｅｌｄ ｈｏｔ ｓｐｏｔ ｓｔｒｅｓｓ ｍｅｔｈｏｄ ａｃｃｏｒｄｉｎｇ ｔｏ ｔｈｅ ＧＬ ａｎｄ ｔｈｅ ＩＩＷ ｓｐｅｃｉｆｉｃａｔｉｏｎｓꎬ ｗｈｉｃｈ ｃｏｕｌｄ ｕｓｅ ｔｏ ａｓｓｅｓｓ ｔｈｅ ｕｌｔｉｍａｔｅ ｓｔｒｅｎｇｔｈ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ｗｅｌｄｓ. Ｆｉｎａｌｌｙꎬ ｔｈｅ ｆａｔｉｇｕｅ ｓｔｒｅｎｇｔｈ ａｓｓｅｓｓｍｅｎｔｓ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ｗｅｌｄｓ ｗｅｒｅ ｓｔｕｄｉｅｄ ｂｙ ｔｈｅ ｆａｔｉｇｕｅ ａｎａｌｙｓｉｓ ｓｏｆｔｗａｒｅ Ｆｅｓａｆｅ ｃｏｍｂｉｎｉｎｇ ｔｈｅ ｆａｔｉｇｕｅ ｌｏａｄ ｓｐｅｃｔｒｕｍ ｏｆ ｔｈｅ ｐｉｔｂｏｘ ａｎｄ Ｓ/ Ｎ ｃｕｒｖｅ ｏｆ ｔｈｅ ｗｅｌｄ. Ｔｈｅ ｒｅｓｕｌｔｓ ｉｎｄｉ￣ ｃａｔｅ ｔｈａｔ ｔｈｅ ｓａｆｅｔｙ ｆａｃｔｏｒｓ ｏｆ ｔｈｅ ｗｅｌｄｓ ｏｆ ｔｈｅ ｐｉｔｃｈｂｏｘ ａｒｅ ａｂｏｖｅ １ ａｎｄ ｈａｖｅ ｓｕｆｆｉｃｉｅｎｔ ｓｔｒｅｎｇｔｈ ｔｏ ｆｕｌｆｉｌｌ ｔｈｅ ｄｅｓｉｇｎ ｒｅｑｕｉｒｅｍｅｎｔ ａｎｄ ｔｈｅ ｍｅｔｈ￣ ｏｄ ｉｎ ｔｈｉｓ ｓｔｕｄｙ ｉｓ ｆｅａｓｉｂｌｅ. [ABSTRACT FROM AUTHOR]

Ａｉｍｉｎｇ ａｔ ｔｈｅ ｓａｆｅｔｙ ｏｆ ｔｏｗｅｒ ｆｌａｎｇｅ ｉｎ ｔｈｅ ＭＷ ｗｉｎｄ ｔｕｒｂｉｎｅ ｏｐｅｒａｔｉｎｇ, ｔａｋｅ ａ ｃｅｒｔａｉｎ ｈｉｇｈ ｐｏｗｅｒ ｌｅｖｅｌ ｗｉｎｄ ｔｕｒｂｉｎｅ ｔｏｐ ｆｌａｎｇｅ ｆｏｒ ｅｘａｍｐｌｅ, ｔｈｅ ｆｉｎｉｔｅ ｅｌｅｍｅｎｔ ｍｏｄｅｌ ｏｆ ｔｈｅ ｔｏｗｅｒ ｆｌａｎｇｅ ｃｏｎｎｅｃｔｉｏｎ ｓｙｓｔｅｍ ｗｈｉｃｈ ｉｎｃｌｕｄｉｎｇ ｔｏｐ ｔｏｗｅｒ, ｔｏｐ ｆｌａｎｇｅ, ｂｏｌｔｓ, ｗａｓｈｅｒｓ, ｂｏｔｔｏｍ ｆｌａｎｇｅ ａｎｄ ｂｏｔｔｏｍ ｔｏｗｅｒ ｗａｓ ｂｕｉｌｔ ｕｐ ｔｏ ａｎａｌｙｚｅ ｉｔｓ ｓｔｒｅｓｓ ｄｉｓｔｒｉｂｕｔｉｏｎ ｕｎｄｅｒ ｔｈｅ ｕｌｔｉｍａｔｅ ｌｏａｄ ｃａｓｅ, ａｎｄ ａ ｎｅｗ ｍｅｔｈｏｄ ｗｈｉｃｈ ｃｏｍｂｉｎｅｓ ｔｈｅ ｃｒｉｔｉｃａｌ ｐｌａｎｅ ｍｅｔｈｏｄ ｗｉｔｈ ｓｈｅａｒ ｓｔｒｅｓｓ ｍｅｔｈｏｄ ｔｏ ｃａｌｃｕｌａｔｅ ｔｈｅ ｆａｔｉｇｕｅ ｄａｍａｇｅ ｏｆ ｔｏｗｅｒ ｆｌａｎｇｅ ｗａｓ ｔｈｅｎ ｐｒｏｐｏｓｅｄ ｉｎ ｔｈｅ ｔｏｗｅｒ ｆｌａｎｇｅ ｆａｔｉｇｕｅ ｓｔｒｅｎｇｔｈ ｃａｌｃｕｌａｔｉｏｎ ｍｅｔｈｏｄ ｓｔｕｄｙ. Ｔｈｅ ｒｅｓｕｌｔｓ ｉｎｄｉｃａｔｅ ｔｈａｔ ｔｈｅ ｔｏｗｅｒ ｆｌａｎｇｅ ｕｌｔｉｍａｔｅ ｓｔｒｅｎｇｔｈ ｓａｆｅｔｙ ｆａｃｔｏｒ ｉｓ １. １, ａｎｄ ｉｔｓ ｆａｔｉｇｕｅ ｓｔｒｅｎｇｔｈ ｓａｆｅｔｙ ｆａｃｔｏｒ ｉｓ ５. １６３, ａｌｌ ｏｆ ｔｈｅｍ ａｂｏｖｅ １ ａｎｄ ｔｈｅ ｃｒｉｔｉｃａｌ ｌｏｃａｔｉｏｎｓ ａｒｅ ｃｏｎｓｉｓｔｅｎｔ ｗｉｔｈ ｅｎｇｉｎｅｅｒｉｎｇ ｐｒａｃｔｉｃｅ, ｔｈｅ ｔｏｗｅｒ ｆｌａｎｇｅ ｃａｎ ｓａｔｉｓｆｙ ｔｈｅ ｓｔｒｅｎｇｔｈ ｄｅｓｉｇｎ ｒｅｑｕｉｒｅｍｅｎｔｓ ａｃｃｏｒｄｉｎｇ ｔｏ Ｇｅｒｍａｎｉｓｃｈｅｒ Ｌｌｏｙｄ ｓｔａｎｄａｒｄ. Ｂｅｓｉｄｅｓ, ｔｈｅ ｒｅｓｕｌｔｓ ａｌｓｏ ｉｎｄｉｃａｔｉｎｇ ｔｈａｔ ｔｈｅ ｐｒｏｐｏｓｅｄ ｍｅｔｈｏｄ ｉｓ ｆｅａｓｉｂｌｅ ａｎｄ ｒｅｌｉａｂｌｅ ｆｏｒ ｔｏｗｅｒ ｆｌａｎｇｅ ｓｔｒｅｎｇｔｈ ｃａｌｃｕｌａｔｉｏｎ. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Mechanical & Electrical Engineering is the property of Mechanical & Electrical Engineering Magazine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)