多自由度电流变阻尼隔震结构的数值分析
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摘要
采用电流变智能隔震装置对多自由度结构进行了基础隔震控制.给出了电流变智能隔震装置的基本构造,提出了隔震装置的恢复力模型.根据摩擦结构运动机理,分析了隔震结构的动力特性,给出了隔震结构各阶段的运动方程及其判别准则,编制了结构非线性动力分析程序.对多自由度隔震结构进行了动力时程分析,分别采用3种恢复力模型的隔震装置对结构进行控制.结果表明,采用电流变智能隔震装置对结构进行控制可以有效地限制隔震层的位移.此外,拟限位型隔震装置还可以有效降低结构加速度,拟摩擦装置对结构加速度有所增加.
The base isolation control analysis of multi-degree of freedom structures(MDOFs) with electrorheological(ER) smart device was carried out.The restoring force model of ER damper has been developed after designing the details of the device.The dynamic characteristics of isolated system were analyzed on the basis of the friction mechanism.Then,the equations and criteria were given for each vibration stage of the isolated system and the corresponding nonlinear analysis program was made.The dynamic time-history analysis was conducted for two MDOFs isolated with ER devices of three different hysteretic rules.The analysis indicated that good control effect could be achieved by reducing the displacement of the isolated system.And the structural acceleration could be reduced significantly with the displacement-limited ER isolator.The acceleration response of structure with pseudo-friction type isolator might be enlarged.
The base isolation control analysis of multi-degree of freedom structures(MDOFs) with electrorheological(ER) smart device was carried out.The restoring force model of ER damper has been developed after designing the details of the device.The dynamic characteristics of isolated system were analyzed on the basis of the friction mechanism.Then,the equations and criteria were given for each vibration stage of the isolated system and the corresponding nonlinear analysis program was made.The dynamic time-history analysis was conducted for two MDOFs isolated with ER devices of three different hysteretic rules.The analysis indicated that good control effect could be achieved by reducing the displacement of the isolated system.And the structural acceleration could be reduced significantly with the displacement-limited ER isolator.The acceleration response of structure with pseudo-friction type isolator might be enlarged.
引文
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[11]Pranesh M,Ravi Sinha.VFPI:An isolation device for a seismic design[J].Earthquake Engineering and StructuralDynamics,2000,29(4):603-627
[2]Makris N,Chang S P.Effect of viscous,viscoplastic and friction damping on the response of seismic isolated structures[J].Earthquake Engineering and Structural Dynamics,2000,29(1):85-107
[3]李斌,杨智春.电流变阻尼器的动态特性实验研究[J].应用力学学报,2003,20(1):81-84Li Bin,Yang Zhichun.Experimental investigations on damping properties of electrorheological fluid damper[J].ChineseJournal of Applied Mechanics,2003,20(1):81-84
[4]孙涛.半主动直接输出反馈变结构控制电流变阻尼器减振研究[J].机械工程学报,2002,38(11):113-118Sun Tao.Semi-active static output feedback variable structure control of ER damper vibration suppression system[J].Chinese Journal of Mechanical Engineering,2002,38(11):113-118
[5]Chen S H,Liu X H.Spectral analysis for response of the dynamic damping force and phenomenological modeling ofelectro-rheological fluid[J].Smart Materials and Structure,1999,8(3):499-503
[6]Gandhi MV,Thompson B S,et al.Smart materials and structures incorporating hybrid actuator and sensing systems[J].ASME Aerospace Div.Publication AD,1991,24:751-756
[7]高丽燕,刘文锋,李建峰.ER阻尼器及其在结构地震反应控制中的应用[J].青岛建筑工程学院学报,2004,25(1):29-33Gao Liyan,Liu Wenfeng,Li Jianfeng.ER damper and its application in the control of seismic response of structures[J].Chinese Journal of Qingdao Technological University,2004,25(1):29-33
[8]Peel D J,Stanway R,Bullough W A.Dynamic modelling of an ER vibration damper for vehicle suspension applications[J].Smart Materials and Structure,1996,5(4):591-606
[9]杨飏,欧进萍.新型电流变智能隔震装置的结构隔震效果分析[J].工程力学,2007,24(7):140-145Yang Yang,Ou Jinping.Isolation effects analysis of structure with new type ER smart isolator[J].Chinese EngineeringMechanics,2007,24(7):140-145
[10]Fan F G,Ahmadi G,Tadjbakhsh I G.Base isolation of a multi-story building under a harmonic ground motion-acomparison of performances of various system[J].Technical Report NCEER-88-0010,1988
[11]Pranesh M,Ravi Sinha.VFPI:An isolation device for a seismic design[J].Earthquake Engineering and StructuralDynamics,2000,29(4):603-627
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