结构振动的滑模变结构半主动控制

研究应用磁流变阻尼器(MRD)对结构振动半主动控制的算法和原理。研制并对磁流变阻尼器进行了阻尼特性实验，采用非线性滞回双粘性模型描述磁流变阻尼器的阻尼特性，模型结果与实验结果非常一致。采用滑模控制算法和趋近律方法设计了半主动控制器。利用滑模控制方法所建立的控制器，本文给出了地震激励下结构振动半主动控制算例。计算分析表明，半主动滑模控制具有控制效果明显、鲁棒性好等优点，是一种非常有发展前途的控制方法。

Sliding-mode-based semi-active control for oscillations of structures

Magnetorheological (MR) dampers are new semi active control devices in which the damping forces are controlled by magnetic field. These dampers are well suited for semi active control of seismically loaded civil structures. In this study, the performance of a semi active control system based on newly developed MR fluid damper has been studied. A nonlinear hysteretic biviscous model is used to investigate the MR damper's behavior. The comparison between the analytical and experimental results verifies the theoretical analysis of the developed MR damper. On the other hand, this study focuses on the implementation of MR dampers in a semi active control system. The algorithms of semi active control for applications to seismically excited induced structure are studied. The control methods are based on the theory of variable structure system (VSS) or sliding mode control (SMC). A new kind of controller is proposed based on the reaching law method. Excellent results are obtained when this strategy is applied to control a model of a seismically excited three story scaled building. Furthermore, the SMC controller performed better than both the passive off and the passive on control systems for its ability to vary its properties to more effectively control the structure. The results clearly demonstrate that the MR damper has the potential for improving the seismic behavior of civil structures.