结构振动的离散变结构控制方法

Discrete Variable Structure Control Method for Vibration Control of Building Structures

采用离散系统建模技术和变结构控制系统设计的离散趋近律方法 ,对地震作用下建筑结构的振动控制问题进行了研究 ,给出了系统切换函数的确定方法 ,推导了系统控制律的表示式。算例分析结果表明 ,该控制方法能有效地减小结构的地震响应 ,对于结构抗震控制易于接受的特定采样时间间隔 。

Active control approaches on the basis of using the discrete variable structure control theory are studied for applications to seismically excited building structures. Based on the discrete reaching law method, a feedback controller is presented. The controller is extended by introducing the saturated control method to avoid the adverse effect when the actuators are saturated due to unexpected extreme earthquakes. The simulation results are obtained for SDOF and MDOF shear building equipped with active brace system (ABS) under seismic excitations. It is found that the discrete variable structure control method presented in the paper is quite effective.