该文针对大型浮式风力机的系泊系统,研究其疲劳计算分析方法,引入Goodman方程,考虑动张力的平均应力值来修正系泊线应力的非对称峰值,并基于修正后的不同应力峰值确定临界疲劳循环次数,进而计算疲劳损伤。利用该方法计算10 MW风力机系泊线的疲劳损伤和疲劳寿命,结果表明系泊线平均应力值对疲劳损伤有重要影响,在系泊线的疲劳分析中,应引入Goodman修正计算疲劳损伤,该文10 MW风力机疲劳性能满足要求。
Abstract
The fatigue calculation and analysis method is studied for the mooring system of large floating wind turbine. The dynamic tension of the floating wind turbine mooring system is time-varyingand asymmetric about the time axis. The effect of the average cyclic stress is ignored in the current fatigue analysis of floating wind turbine mooring lines. Only the effect of the asymmetric peak of the mooring tension is considered to calculate the fatigue damage. The Goodman equation is introduced to correct the asymmetric peak value of mooring line stress by considering the average cyclic stress value of the dynamic tension. The critical fatigue cycle number is determined based on the corrected peak value of different stresses to calculate the fatigue damage. Based on the Goodman equation correction method, the fatigue damage and fatigue life of 10 MW wind turbine were calculated. The results show that the cycle-averaged stress value of the mooring line has an important influence on the fatigue damage,and the Goodman equation should be introduced to correct the asymmetric stress peaks in the fatigue analysis,the fatigue performance of the 10 MW wind turbine mooring system meets the safety requirements.
关键词
风力机 /
系泊线 /
疲劳损伤 /
Goodman方程 /
非对称循环应力
Key words
floating wind turbine /
mooring lines /
fatigue damage /
Goodman equation /
asymmetric circlic stress
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