近海单桩风机在波浪地震联合作用下的动力特性分析
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摘要
针对典型单桩海上风机结构,利用ANSYS建立有限元模型,并根据实际情况选取3种地震加速度激励和两个水深的波浪荷载,对结构进行地震单独作用动力分析以及地震与波浪联合作用下动力分析.对比分析结果表明:地震发生时,在水位较低、波浪较小的情况下,结构主要以地震作用引起的响应为主,波浪引起的响应相对较小;若地震发生的同时伴有极端恶劣海况,则结构响应较大;波浪对结构下部响应有较大的影响;由于地震加速度峰值与波浪力峰值之间存在相位差,所以两者联合作用时,结构的响应也会有减小的情况发生.由此可见,地震发生时波浪的存在将对结构动力响应造成不同程度的影响,在进行海上风机设计时,有必要考虑地震与波浪联合作用的情况.
Based on the FEM software ANSYS,a model of a typical mono-pile offshore wind turbine is built to calculate the dynamic response of the structure. Two different water depths and three kinds of earthquake acceleration are chosen for wave loads and seismic excitation based on the natural frequency of the structure and the actual cases. The calculation results show that when the water is shallow and relative small,the dynamic response of the structure is mainly caused by the seismic excitation and the influence of wave can be ignored. However,for high sea,wave seriously influences the response of the base. Due to the phase difference between peaks of seismic and wave,the dynamic response of the structure may be decreased for joint action. The dynamic response of the offshore wind turbine will be influenced to different extent under the combined excitation of wave and seismic. So it is necessary to take wave and seismic together into consideration in offshore wind turbine design.
Based on the FEM software ANSYS,a model of a typical mono-pile offshore wind turbine is built to calculate the dynamic response of the structure. Two different water depths and three kinds of earthquake acceleration are chosen for wave loads and seismic excitation based on the natural frequency of the structure and the actual cases. The calculation results show that when the water is shallow and relative small,the dynamic response of the structure is mainly caused by the seismic excitation and the influence of wave can be ignored. However,for high sea,wave seriously influences the response of the base. Due to the phase difference between peaks of seismic and wave,the dynamic response of the structure may be decreased for joint action. The dynamic response of the offshore wind turbine will be influenced to different extent under the combined excitation of wave and seismic. So it is necessary to take wave and seismic together into consideration in offshore wind turbine design.
引文
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[3]Li Jie,Zhang Zili,Chen Jianbing.Experimental study on vibration control of offshore wind turbines using a ball vibration absorber[J].Energy and Power Engineering,2012(4):153-157.
[4]Prowell I,Veletsos M,Elgamal A,et al.Experimental and numerical seismic response of a 65 k W wind turbine[J].Journal of Earthquake Engineering,2009,13(8):1172-1190.
[5]贺广零,周勇,李杰.风力发电高塔系统地震动力响应分析[J].工程力学,2009,26(7):72-77.He Guangling,Zhou Yong,Li Jie.Seismic analysis of wind turbine system[J].Engineering Mechanics,2009,26(7):72-77.(in Chinese)
[6]何晓宇,李宏男.地震与波浪联合作用下海洋平台动力特性分析[J].海洋工程,2007,25(3):18-25.He Xiaoyu,Li Hongnan.Dynamic analysis of offshore platform under seismic action and wave action[J].The Oceam Engineering,2007,25(3):18-25.(in Chinese)
[7]Jonkman J,Butterfield S,Musial W,et al.Definition of a 5-MW reference wind turbine for offshore system development[R].NREL/TP-500-38060.Goloen Colorado,USA:National Renewable Energy Laboratory,2009.
[8]杨树耕,藤明清,孟昭瑛,等.有限元分析软件ANSYS在海洋工程中的应用(续1)[J].中国海洋平台,2000,15(5):40-46.
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