海上风电基础结构动力分析
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摘要
针对单桩、三桩、四桩导管架3种常规海上风电基础结构型式动力特性展开研究。以模态分析为基础,获得结构整体固有频率和振型;进而综合运用谐响应分析、瞬态分析、谱分析等方法,对基础结构在简谐荷载、冲击荷载、地震荷载及波浪荷载作用下的动力响应特性进行了数值模拟计算和分析。结果显示:本设计中的单桩、三桩、四桩基础结构刚度依次增大,一阶固有频率递增;对于相同的动力荷载激励,基础结构动力响应递减;基础结构设计中既要保证结构具有足够的刚度以满足荷载作用下的变形控制要求,还要使基础刚度适中以避免共振。为海上风电基础结构动力分析提供了参考。
The dynamic characters of three common foundation frames(monopile,tripod and jacket) for offshore wind turbine are investigated.The natural frequencies and modes of structures are calculated through mode analysis.Harmonic, transient and spectrum analyses are used,and the dynamic responses of the foundational structures under harmonic load, impact load,earthquake load and wave load are simulated and analyzed.It reveals that the first order natural frequencies of the present three foundations(monopile,tripod and jacket) increase with the increasing of their structure stiffness,and their dynamic responses decrease for the same dynamic loads.It is necessary and important to make sure that the foundation stiffness is enough to control the structure deformation and is reasonable to avoid resonance.The research results will supply valuable references for designers and constructors.
The dynamic characters of three common foundation frames(monopile,tripod and jacket) for offshore wind turbine are investigated.The natural frequencies and modes of structures are calculated through mode analysis.Harmonic, transient and spectrum analyses are used,and the dynamic responses of the foundational structures under harmonic load, impact load,earthquake load and wave load are simulated and analyzed.It reveals that the first order natural frequencies of the present three foundations(monopile,tripod and jacket) increase with the increasing of their structure stiffness,and their dynamic responses decrease for the same dynamic loads.It is necessary and important to make sure that the foundation stiffness is enough to control the structure deformation and is reasonable to avoid resonance.The research results will supply valuable references for designers and constructors.
引文
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Li Wei,2011.Study on the Fuzziness in Fatigue Life Estimation of the Foundation of Offshore Wind Turbine.Advanced Materials Research, vols.243-249:4741-4745.
李茜,杨树耕,2003.采用ANSYS程序的自升式平台结构有限元动力分析.中国海洋平台,18(4):41-46.
李炜,郑永明,周永,2010a.海上风电基础ANSYS数值模拟.水运工程(8):125-128.
李炜,郑永明,周永,2010b.近海风电基础桩土作用3D有限元模拟.水电能源科学,28(8):162-164.
刘琳,2008.特定海区海上风电单立柱结构动力耦合特性研究.青岛:中国海洋大学.
舒铁,2005.单立柱海洋平台安全性评价研究.大连:大连理工大学.
王靖,许涛,2003.海上桶形基础采油平台综合分析.海洋技术,(3): 27-28.
王湘明,陈亮,邓英,等,2008.海上风力发电机组塔架海波载荷的分析.沈阳工业大学学报,50(1):42-45.
张枢文,2007.海洋平台结构损伤识别与健康监测技术研究.镇江:江苏科技大学.
竺艳蓉,谢峻,龚佩华,1991.各种波浪谱在海洋工程中适用性的研究.海洋学报,17(6):126-131.
Li Wei,2011.Study on the Fuzziness in Fatigue Life Estimation of the Foundation of Offshore Wind Turbine.Advanced Materials Research, vols.243-249:4741-4745.
李茜,杨树耕,2003.采用ANSYS程序的自升式平台结构有限元动力分析.中国海洋平台,18(4):41-46.
李炜,郑永明,周永,2010a.海上风电基础ANSYS数值模拟.水运工程(8):125-128.
李炜,郑永明,周永,2010b.近海风电基础桩土作用3D有限元模拟.水电能源科学,28(8):162-164.
刘琳,2008.特定海区海上风电单立柱结构动力耦合特性研究.青岛:中国海洋大学.
舒铁,2005.单立柱海洋平台安全性评价研究.大连:大连理工大学.
王靖,许涛,2003.海上桶形基础采油平台综合分析.海洋技术,(3): 27-28.
王湘明,陈亮,邓英,等,2008.海上风力发电机组塔架海波载荷的分析.沈阳工业大学学报,50(1):42-45.
张枢文,2007.海洋平台结构损伤识别与健康监测技术研究.镇江:江苏科技大学.
竺艳蓉,谢峻,龚佩华,1991.各种波浪谱在海洋工程中适用性的研究.海洋学报,17(6):126-131.
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