磁流变阻尼器被动隔震振动台试验研究

Experimental Research on Vibration Table of Passive Isolation with Magnetorheological Fluid Damper

目的检验磁流变阻尼器应用于结构被动隔震控制下的减震效果.方法对1∶4缩尺比例的结构模型进行橡胶垫与磁流变阻尼器联合控制下的振动台试验,试验采用对磁流变阻尼器施加零电压和最大电压控制,来模拟结构在阻尼器被动摩擦阻尼和被动粘滞阻尼两种控制方式下,隔震上部结构和隔震层的的动力响应.结果应用磁流变阻尼器对结构进行的两种被动控制,均能起到很好的减震效果.其中被动摩擦控制可对隔震结构在大震下的隔震层位移起到限位作用;被动粘滞阻尼控制可对隔震结构小震下上部结构的加速度反应进行很好的控制.结论采用橡胶垫联合磁流变阻尼器对结构进行被动隔震控制,控制方法简便易行,控制效果良好.

Magnetorheological Fluid damper has good smart performances, broadly controlled band, fast response and demand for a little energy. In the paper, a passive isolation system, which is combined with rubber bearing and MR damper, is applied to structural vibration control. Two control modes, passive friction damp and passive viscous damp, are realized by control voltage of the MR damper. When MR damper is in the maximal voltage, it becomes a passive friction damper. When MR damper is in zero voltage, it becomes a passive viscous damper. And vibration table experimentation is carried out with the passive isolation system. The experimentation indicates that the isolation system can limit displacement of the isolation layer in rarely occurred earthquakes with passive friction control and reduce acceleration reaction of the isolation structure in frequently occurred and basic earthquakes with viscous damp control. And two control modes are simple and convenient.