黏滞阻尼器对拉索参数振动的控制分析
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摘要
提出采用黏滞阻尼器对拉索参数振动进行控制,建立了黏滞阻尼器控制拉索参数振动的运动方程。从频域和时域以及起振幅值等角度,研究了最优黏滞阻尼器对不同垂度拉索参数振动的控制效果;此外,还研究了最优黏滞阻尼器安装位置对拉索参数振动控制效果的影响。研究表明,黏滞阻尼器可以有效控制拉索的参数振动,控制效果与拉索的激励幅值、最优阻尼器的安装位置和斜拉索的垂度有关。激励幅值越大,控制效果一般越差;最优阻尼器的安装位置越靠近跨中,则控制效果越好;黏滞阻尼器对大垂度拉索的控制效果不及对小垂度拉索的控制效果。
Viscous fluid dampers are attached to control the oscillation of a cable induced by a parametric excitation,and the equation of motion for the cable-viscous fluid damper system is established.From the aspects of frequency,time domain and amplitude of inducing vibration,the control effectiveness of the optimal viscous fluid dampers for parametric vibration of the cables with different sags is studied.At the same time,the relationship between the installed position of the optimal damper and the control effectiveness of parametric vibration is also analyzed.The study results indicate that the viscous fluid damper can effectively control the parametric vibration,and the control effectiveness is related to the excitation amplitude,the installed position of the optimal damper and the sag of the cable.The larger the excitation amplitude is,the lower the control effectiveness is;the shorter the distance between the installed position and midspan of the cable is,the higher the control effectiveness is.The control effectiveness of the cable with small sag is higher than the cable with large sag.
Viscous fluid dampers are attached to control the oscillation of a cable induced by a parametric excitation,and the equation of motion for the cable-viscous fluid damper system is established.From the aspects of frequency,time domain and amplitude of inducing vibration,the control effectiveness of the optimal viscous fluid dampers for parametric vibration of the cables with different sags is studied.At the same time,the relationship between the installed position of the optimal damper and the control effectiveness of parametric vibration is also analyzed.The study results indicate that the viscous fluid damper can effectively control the parametric vibration,and the control effectiveness is related to the excitation amplitude,the installed position of the optimal damper and the sag of the cable.The larger the excitation amplitude is,the lower the control effectiveness is;the shorter the distance between the installed position and midspan of the cable is,the higher the control effectiveness is.The control effectiveness of the cable with small sag is higher than the cable with large sag.
引文
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[9]Pacheo B M,Fujino Y,Sulekh A.Estimation curve model damping in stay cables with viscous damping[J].Journal of Structure Engineering,ASCE,1993,119(6):1961-1979.
[2]Makris N,Constantinou MC.Viscous dampers:testing,modeling,application in vibration and seismic isolation[R].Buffalo:State University ofNew York NCEER report-90-0028,1990.
[3]沈崇棠,刘鹤年.非牛顿流体力学及其应用[M].北京:高等教育出版社,1989.
[4]Soong TT,Dargush G F.Passive energy dissipation system in structural engineering[M].Chichester:John Wiley&Sons Ltd,1997.
[5]Lilien J L,Costa A P D.Vibration amplitudes caused by parametric excitation of cable stayed structures[J].Journal of Sound and Vibration,1994,174(1):69-90.
[6]Irvine HM.Cable structures[M].Cambridge:The MITPress,1981.
[7]Ou J P,Wu B,Soong TT.Recent advances in research on and application of passive energy dissipation systems[J].地震工程与工程振动,1996,16(3):72-98.
[8]Main J A,Jones N P.Evaluation of viscous damper for stay-cable vibration mitigation[J].Journal of Bridge Engineering,ASCE,2001,6(6):385-388.
[9]Pacheo B M,Fujino Y,Sulekh A.Estimation curve model damping in stay cables with viscous damping[J].Journal of Structure Engineering,ASCE,1993,119(6):1961-1979.
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