基于磁流变阻尼器的隔震高架桥Skyhook控制

Skyhook control of isolated elevated highway bridge based on magnetorheological(MR) damper

为进一步提高隔震高架桥的抗震性能,避免在强震下隔震支座位移过大,可以将附加减震措施与隔震支座配合使用,组成混合隔震系统。基于位移控制目标,研究了简化的两自由度高架桥线性模型分别在最优被动控制、LQR主动控制、LQR-Clipped磁流变(MR)阻尼器半主动控制及MR阻尼器Skyhook控制下的地震响应。研究结果表明,基于Skyhook控制的MR阻尼器控制效果可以达到LQR-Clipped控制的效果,相对最优被动控制也体现出一定的优越性。并且Skyhook控制系统简单,具有较强的实用价值。

To further enhance the seismic performance of isolated elevated highway bridge and avoid the excessive displacement of bearings,supplemental vibration control device may be added to work with isolation bearings and form the hybrid control system.Based on the control of displacement objective,the seismic responses of the simplified linear two-degrees-of-freedom bridge model under different control strategies were investigated namely,optimal passive control,LQR active control,LQR-clipped MR semi-active control as well as Skyhook MR control.The numerical simulation results show that Skyhook control strategy can get good control performance close to that of LQR-clipped control,and Skyhook control also works considerably better than optimal passive control.Moreover,Skyhook control system is simpler and has better practical utility.