Tower is an important fundamental component of large-scale wind turbines.The fatigue performance of the tower welded part directly affects the running safety and reliability of wind turbines.A fatigue life predicting ...Tower is an important fundamental component of large-scale wind turbines.The fatigue performance of the tower welded part directly affects the running safety and reliability of wind turbines.A fatigue life predicting method for the longitudinal welding seam of the tower is proposed in this paper.Under the precondition of satisfying the limit strength,the time series stress of each working condition is obtained by DIN18800-4 section stress calculation.Combined with the rain-flow counting method and the Miner linear cumulative damage theory,the fatigue life of the tower longitudinal weld is predicted.The results show that the tower structure meets the design requirement,and the feasibility and effectiveness of the method are verified.展开更多
Flange joint part is the weak link of wind turbine tower.In view of the special structure,complex stress and easy failure of the connecting bolt of the wind turbine tower flange,the relationship between the external l...Flange joint part is the weak link of wind turbine tower.In view of the special structure,complex stress and easy failure of the connecting bolt of the wind turbine tower flange,the relationship between the external load of the tower section and the internal stress of the bolt is established by the finite element method,and the time series internal stress of the bolt is calculated by the Schmidt-Neuper algorithm.The S-N curve which is suitable for the connecting bolt material of the tower flange is selected by the GL2010 specification.On the basis of Miner’s fatigue cumulative damage theory and rain flow counting method,the fatigue strength of the whole ring bolt is roughly calculated,and the most dangerous part is determined.The axial symmetry model of screw connection is used for accurately calculating the fatigue cumulative damage of the bolt at the dangerous part.The results show that the fatigue life of the bolts in the most dangerous position can meet the requirements,the engineering algorithm has advantages in determining the dangerous part of the whole ring bolt,and the finite element method has high accuracy in predicting the fatigue life of the bolts in the dangerous part.The proposed method is feasible and effective in predicting the fatigue life of the flange joint bolts of the tower.展开更多
基金the Special Research Fund for the Natural Science Foundation of Inner Mongolia Autonomous Region(No.2019MS05070)。
文摘Tower is an important fundamental component of large-scale wind turbines.The fatigue performance of the tower welded part directly affects the running safety and reliability of wind turbines.A fatigue life predicting method for the longitudinal welding seam of the tower is proposed in this paper.Under the precondition of satisfying the limit strength,the time series stress of each working condition is obtained by DIN18800-4 section stress calculation.Combined with the rain-flow counting method and the Miner linear cumulative damage theory,the fatigue life of the tower longitudinal weld is predicted.The results show that the tower structure meets the design requirement,and the feasibility and effectiveness of the method are verified.
基金the Special Research Fund for the Natural Science Foundation of Inner Mongolia Autonomous Region(No.2019MS05070)。
文摘Flange joint part is the weak link of wind turbine tower.In view of the special structure,complex stress and easy failure of the connecting bolt of the wind turbine tower flange,the relationship between the external load of the tower section and the internal stress of the bolt is established by the finite element method,and the time series internal stress of the bolt is calculated by the Schmidt-Neuper algorithm.The S-N curve which is suitable for the connecting bolt material of the tower flange is selected by the GL2010 specification.On the basis of Miner’s fatigue cumulative damage theory and rain flow counting method,the fatigue strength of the whole ring bolt is roughly calculated,and the most dangerous part is determined.The axial symmetry model of screw connection is used for accurately calculating the fatigue cumulative damage of the bolt at the dangerous part.The results show that the fatigue life of the bolts in the most dangerous position can meet the requirements,the engineering algorithm has advantages in determining the dangerous part of the whole ring bolt,and the finite element method has high accuracy in predicting the fatigue life of the bolts in the dangerous part.The proposed method is feasible and effective in predicting the fatigue life of the flange joint bolts of the tower.
