环境激励下特高压输电塔线体系气动阻尼的识别
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摘要
结合±800 kV特高压直流输电线路气弹模型的风洞试验,利用经验模态法、随机减量法及H ilbert变换法识别环境激励下气弹模型的结构参数.研究输电单塔及塔线体系在不同风速下气动阻尼及固有频率的变化特性.结果表明:在环境激励下,结构频率有随风速减小的趋势,而气动阻尼比有明显增加,特别是塔线体系较单塔更为显著;塔线体系的频率及阻尼比较单塔均有提高,阻尼比提高较为明显,随着风速的增加,气动阻尼变化明显,气动阻尼对风振响应的影响应引起重视.
On the aeroelastic model tunnel test of ±800 kV UHV DC transmission lines,the structural parameters of the aeroelastic model under the ambient excitation with the empirical mode decomposition(EMD),random decrement technique(RDT) and Hilbert transform are identified.The characteristics of the aerodynamic damping and natural frequency of the transmission tower and transmission line system under the different wind speed are studied.It is found that the effect of aerodynamic damping to the wind-induced vibration in the case of transmission line system cannot be ignored.
On the aeroelastic model tunnel test of ±800 kV UHV DC transmission lines,the structural parameters of the aeroelastic model under the ambient excitation with the empirical mode decomposition(EMD),random decrement technique(RDT) and Hilbert transform are identified.The characteristics of the aerodynamic damping and natural frequency of the transmission tower and transmission line system under the different wind speed are studied.It is found that the effect of aerodynamic damping to the wind-induced vibration in the case of transmission line system cannot be ignored.
引文
[1]李惠彬.大型工程结构模态参数识别技术[M].北京:北京理工大学出版社,2007.
[2]Huang N E,Shen Z,Long S R,et al.The EmpiricalMode Decomposition and Hilbert Spectrum forNonlinear and Nonstationary Time Series Analysis[J].Proc Roy Soc Lond,1998,A454:903-995.
[3]陈隽,徐幼麟.HHT方法在结构模态参数识别中的应用[J].振动工程学报,2003,16(3):383-388.
[4]陈隽,徐幼麟,李杰.Hilbert-Huang变换在密频结构阻尼识别中的应用[J].地震工程与工程振动,2003,23(4):34-42.
[5]Yu Dan Jiang,Ren Wei Xin.EMD-based stochasticsubspace identification of structures from operationalvibration measurements[J].Engineering Structures,2005,27(12):1741-1751.
[6]潘峰,孙炳楠,楼文娟.基于Hilbert-Huang变换的大跨屋盖气动阻尼识别[J].浙江大学学报:工学版,2007,41(1):65-70.
[7]张郁山.希尔伯特-黄变换(HHT)与地震动时程的希尔伯特谱———方法与应用研究[D].北京:中国地震局地球物理研究所,2003.
[8]刘齐茂.用随机减量技术及ITD法识别工作模态参数[J].广西工学院学报,2002,13(4):23-26.
[9]Yang J N,Lei Y,Pan S W,et al.Systemidentification of linear structures based on Hilbert-Huang spectral analysis,Part 1:Normal Modes[J].Earthquake engineering and structural dynamics,2003,32:1443-1467.
[10]A M Loredo-Souza,A G Davenport.A novel approachfor wind tunnel modelling of transmission lines[J].Journal of Wind Engineering and IndustrialAerodynamics,2001,89:1017-1029.
[11]Irvine H M.Cable structures[M].[S.l.]:The MITPress,1981.
[12]郭勇.大跨越输电塔线体系的风振响应及振动控制研究[D].杭州:浙江大学,2006:20-24.
[2]Huang N E,Shen Z,Long S R,et al.The EmpiricalMode Decomposition and Hilbert Spectrum forNonlinear and Nonstationary Time Series Analysis[J].Proc Roy Soc Lond,1998,A454:903-995.
[3]陈隽,徐幼麟.HHT方法在结构模态参数识别中的应用[J].振动工程学报,2003,16(3):383-388.
[4]陈隽,徐幼麟,李杰.Hilbert-Huang变换在密频结构阻尼识别中的应用[J].地震工程与工程振动,2003,23(4):34-42.
[5]Yu Dan Jiang,Ren Wei Xin.EMD-based stochasticsubspace identification of structures from operationalvibration measurements[J].Engineering Structures,2005,27(12):1741-1751.
[6]潘峰,孙炳楠,楼文娟.基于Hilbert-Huang变换的大跨屋盖气动阻尼识别[J].浙江大学学报:工学版,2007,41(1):65-70.
[7]张郁山.希尔伯特-黄变换(HHT)与地震动时程的希尔伯特谱———方法与应用研究[D].北京:中国地震局地球物理研究所,2003.
[8]刘齐茂.用随机减量技术及ITD法识别工作模态参数[J].广西工学院学报,2002,13(4):23-26.
[9]Yang J N,Lei Y,Pan S W,et al.Systemidentification of linear structures based on Hilbert-Huang spectral analysis,Part 1:Normal Modes[J].Earthquake engineering and structural dynamics,2003,32:1443-1467.
[10]A M Loredo-Souza,A G Davenport.A novel approachfor wind tunnel modelling of transmission lines[J].Journal of Wind Engineering and IndustrialAerodynamics,2001,89:1017-1029.
[11]Irvine H M.Cable structures[M].[S.l.]:The MITPress,1981.
[12]郭勇.大跨越输电塔线体系的风振响应及振动控制研究[D].杭州:浙江大学,2006:20-24.
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