(1.College of Energy and Electrical Engineering,Hohai University,Nanjing,Jiangsu 210098,China;2.State Key Engineering Research Center of Efficient Utilization of Water Resources and Engineering Safety,Nanjing,Jiangsu 210098,China;3.College of Hydro-logy and Water Resources,Hohai University,Nanjing,Jiangsu 210098,China)
In order to avoid the system failure and noise pollution caused by the system resonance in the engineering design,the modal analysis and harmonic response computation analysis have been adopted to obtain the low-order natural frequency and harmonic response data of the tower,as well as the dynamic relation between the wind turbine and tower and the dynamic characteristics of the system.The determination of the modal frequency which plays an important role in affecting the dynamic property of the tower will be carried out for the structure optimizations,and then the dynamic disturbance between the turbine and tower should be analyzed.In result,when the wheel rotates at 160 r/min,the harmonic load has a very serious destructive damage to the tower.In the case of exciting force unchanged of optimizing,first-order natural frequencies is improved,tower column of maximum displacement of natural frequencies of all order significantly reduce.Some optimization works such as increasing the thickness of the tower and enhancing its rigidity have been done which improve the feasibility of the optimization through the dynamic calculation.
ZHENG Yuan, Si-Jia-Jun, Huang-Jian-Jun et al. Dynamic analysis and optimization on tower of vertical axis wind turbine structure[J]. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(3): 246-250.
Amanda Jacob.Another record year for wind energy[J].Reinforced Plastics,2006,4:26 -27.