Abstract:In this paper, Magnetorheological Fluid damper (MRFD) is used for seismic control of arch bridge. Firstly, model reduction of long-span arch bridge is implemented based on modal analysis in order to design of semi-active control system. About the problem of spillover due to unmodeled frequency domain uncertainties by neglected modes in the reduced order structural system, which may lead to the destabilization of control system, a robust control strategy based on mixed sensitivity is proposed to eliminate spillover instability. And then Sign-based function semi-active control algorithm is applied to command MRFD. The Nimu arch bridge is used as a simulation example to verify the proposed control scheme. Numerical simulation results demonstrate that, in contrast to the conventional LQG semi-active control method, this method can suppress spillover instability efficiently and has better robust performance.
李正英;熊辉. 大跨度拱桥基于降阶模型的半主动鲁棒控制[J]. , 2010, 29(1): 117-120,.
LI Zheng-ying;Xiong Hui. ROBUST SEMI-ACTIVE CONTROL of LONG-SPAN ARCH BRIDGE BASED ON REDUCED ORDER MODEL. , 2010, 29(1): 117-120,.