风力发电高塔系统地震动力响应分析
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摘要
该文研究了风力发电高塔系统地震动力响应分析问题。首先,基于随机地震动物理模型,生成了均值参数地震动加速度时程。然后,建立了风力发电高塔系统"桨叶-塔体-基础"一体化有限元模型。为了明确土-结构相互作用(SSI)对风力发电高塔系统动力行为的影响,建立了考虑基础和周围土体影响的对比模型。在这两种模型的基础上,对风力发电高塔系统进行了地震作用动力时程分析。研究表明:风力发电高塔系统地震动力响应非常突出,在地震活跃地区,地震作用很可能成为风力发电高塔系统的控制荷载之一。同时发现,考虑SSI效应会导致结构响应一定程度放大。因此,在对风力发电高塔系统进行地震动力响应分析时,必须考虑SSI效应。
The dynamic response of a wind turbine system under earthquake action is numerically investigated.First, the physical stochastic model is introduced and the corresponding mean value earthquake record is given.Then an integrated finite element(FE) model of a wind turbine system consisting of the rotor, the nacelle, the tower and the foundation is established.To evaluate the effect of the soil-structure interaction(SSI) on the dynamic performance of the wind turbine system, a comparative FE model taking the foundation and surrounding soil into consideration is also created.Then, the time history analysis of the system under the input of mean value earthquake record is carried out.The results show that the seismic response of the wind turbine system is remarkable and may be the dominant factor in the design of wind turbine systems located at a seismically active zone.It is also found that apparent difference exists between the results from the model considering SSI effect and that from the model not considering SSI effect.
The dynamic response of a wind turbine system under earthquake action is numerically investigated.First, the physical stochastic model is introduced and the corresponding mean value earthquake record is given.Then an integrated finite element(FE) model of a wind turbine system consisting of the rotor, the nacelle, the tower and the foundation is established.To evaluate the effect of the soil-structure interaction(SSI) on the dynamic performance of the wind turbine system, a comparative FE model taking the foundation and surrounding soil into consideration is also created.Then, the time history analysis of the system under the input of mean value earthquake record is carried out.The results show that the seismic response of the wind turbine system is remarkable and may be the dominant factor in the design of wind turbine systems located at a seismically active zone.It is also found that apparent difference exists between the results from the model considering SSI effect and that from the model not considering SSI effect.
引文
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[2]Lobtiz D W.A Nastran-based computer program for structural dynamic analysis of horizontal axis wind turbine[C]//Sandia National Laboratory.Proceedings of the Horizontal Axis Wind Turbine Technology Workshop.Ohio USA,Department of Energy and NASA-Lewis,1984.
[3]Bazeos N,Hatzigeorgiou G D,Hondros I D.Static,seismic and stability analyses of a prototype wind turbine steel tower[J].Engineering Structures,2002,24(8):1015―1025.
[4]Lavassas I,Nikolaidis G,Zervas P.Analysis and design of the prototype of a steel1-MW wind turbine tower[J].Engineering Structures,2003,25(8):1097―1106.
[5]Murtagh P J,Collins R,Basu B.Dynamic response and vibration control of wind turbine towers[J].Irish Engineers Journal,2004,58(7):1―7.
[6]李杰.工程结构随机动力激励的物理模型[R].同济大学,2006.Li Jie.Physical stochastic models for the dynamic excitation of engineering structures[R].Tongji University,2006.(in Chinese)
[7]李杰,艾晓秋.基于物理的随机地震动模型研究[J].地震工程与工程振动,2006,26(5):21―26.Li Jie,Ai Xiaoqiu.Study on random model of earthquake ground motion based on physical process[J].Earthquake Engineering and Engineering Vibration,2006,26(5):21―26.(in Chinese)
[8]李杰.随机结构系统——分析与建模[M].北京:科学出版社,1996.Li Jie.Stochastic structural system——Analysis and modelling[M].Beijing:Science Press,1996.(in Chinese)
[9]Wolf J P.Spring-dashpot-mass models for foundation vibrations[J].Journal of Earthqake Engineering and Structural Dynamics,1997,26:931―949.
[10]Richart F E,Hall J R,Woods R D.Vibration of soils and foundations[M].New York:Prentice-Hall,1971.
[11]蔡大用,白峰杉.高等数值分析[M].北京:清华大学出版社,1997.Cai Dayong,Bai Fengshan.Advanced numerical analysis[M].Beijing:Tsinghua University Press,1997.(in Chinese)
[12]艾晓秋.基于随机地震动模型的地下管线地震反应及抗震可靠度研究[D].上海:同济大学,2005.Ai Xiaoqiu.Stochastic earthquake model-based research on seismic response and reliability of underground pipelines[D].Shanghai:Tongji University,2005.(in Chinese)
[13]Zhou Yong,He Guangling,Li Jie.Wind-induced response analysis of wind turbine system[C]//Tongji University.International Symposium on Innovation&Sustainability of Structures in Civil Engineering.Shanghai,China,Southeast University Press,2007.
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