斜拉索-形状记忆合金耗能减振系统动力特性和模态分析
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摘要
提出了斜拉索 -形状记忆合金 (Shape Memory Alloy,简称 SMA)耗能减振系统 ,首先得到了单振型振动的斜拉索 - SMA耗能减振系统附加阻尼比的解析解 ,研究了 SMA耗能减振器参数及其安装位置对附加阻尼比的影响 ;通过数值计算 ,分析了一个模型斜拉索 -形状记忆合金耗能减振系统受迫振动的动力反应 ,研究了 SMA耗能器的减振效果。结果表明 :SMA耗能器能够有效减小斜拉索前几阶振型的振动 ,其减振效果与 SMA耗能器的参数及其安装位置有关。
The dynamic performances of a stay cable incorporated with one shape memory alloy (SMA) damper, which dissipates energy t hrough its super-elastic behavior are studied. At the first time,the addition al damping ratio provided by the SMA damper is theoretically analyzed based on the closed solution of additional damping ratio, and the relationships of the additional damping ratio between the parameters and the location of the damper are further investigated . Taking a cable model stay as example, the response of the stay cable attached with the SMA damper at different location subjected to harmonic excitation in pl ane is also calculated. The analytical results show that the SMA damper adds da mping to the stay cable and simultaneously suppress the first two modal response s of the stay cable significantly, the added damping ratio and the response redu ction are influenced by the parameters and location of the SMA damper.
The dynamic performances of a stay cable incorporated with one shape memory alloy (SMA) damper, which dissipates energy t hrough its super-elastic behavior are studied. At the first time,the addition al damping ratio provided by the SMA damper is theoretically analyzed based on the closed solution of additional damping ratio, and the relationships of the additional damping ratio between the parameters and the location of the damper are further investigated . Taking a cable model stay as example, the response of the stay cable attached with the SMA damper at different location subjected to harmonic excitation in pl ane is also calculated. The analytical results show that the SMA damper adds da mping to the stay cable and simultaneously suppress the first two modal response s of the stay cable significantly, the added damping ratio and the response redu ction are influenced by the parameters and location of the SMA damper.
引文
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[6] IrvineH M.CableStructures[M].MIT Press,Cam bridge,Massachusetts,1981.
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[9] 李惠,毛晨曦.新型SMA耗能器及结构地震反应控制试验研究[J].地震工程与工程振动,2003,23(1):134—135
[2] Abdel-GhaffarA M,KhalifaM A .Importance of cablevibration in dynamics of cable- stayed bridges[J].Journal ofEngineeringMechanics,1991,117(11):2571—2572.
[3] KrenkS.Vibration of a taut cable with an externaldam per[J].Journal ofAppliedMechanics,Transactionof theASME,2000,67:772—774.
[4] MainJ A,JonesN P.Evaluation of viscous dampersfor stay- cable vibration mitigation[J].Journal ofBridgeEngineering,ASCE,2001,6(6):385—388.
[5] JohnsonE A,BakerG A,SpencerB F,et alMitigation stay cable oscillation using semi- activedam ping[A].Proceeding ofSPIE,3988,Sm artStructures andMaterials2000:SmartSystem s forBridges,Structures,andHighways[C],207—216.
[6] IrvineH M.CableStructures[M].MIT Press,Cam bridge,Massachusetts,1981.
[7] 胡海岩.应用非线性动力学[M].北京:航空工业出版社,2000:60—61.
[8] PachecoBM,FujinoY,SulekhA.Estimation curve formodal damping in stay cable with viscous damper[J].Journal ofStructuralEngineering,ASCE,1993;119(9):1961—1965.
[9] 李惠,毛晨曦.新型SMA耗能器及结构地震反应控制试验研究[J].地震工程与工程振动,2003,23(1):134—135
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