设置AMD的铁路钢桥鲁棒控制研究

Research on robust control for steel railway bridges with AMD

对设置主动质量阻尼器(AMD)的铁路钢桥在列车荷载通过时振动响应的鲁棒控制方法进行研究。建立设置AMD系统的铁路钢桥在列车荷载作用下的受控状态方程以及鲁棒控制方法,并以某铁路钢桥为工程背景,建立该铁路钢桁架桥梁的整体壳体模型以及下弦节点实体子模型,对装置AMD系统的铁路钢桥在不同车速荷载作用下使用不受控制、LQR主动控制算法和鲁棒控制算法下其位移振动响应的控制效果进行对比,并初步分析节点最大正应变的鲁棒控制效果。研究结果表明:对于设置AMD且承受不同车速荷载的铁路钢桥在使用鲁棒控制算法时,其位移响应和节点最大正应变的控制效果明显优于LQR主动控制。

The robust control method for the vibration response of the railway steel bridge with active mass damper(AMD)under passing train load was studied.The controlled state equation and robust control method of the railway steel bridge with AMD system under the action of train load were established.Taking a railway steel bridge as engineering background,the integral shell model and lower-chord node entity submodel of the railway steel truss bridge were set up.The control effects of vibration response of the railway steel bridge with AMD system under the load of different speed train were compared by using uncontrol,LQR active control algorithm and robust control algorithm while a preliminary analysis of robust control effect for node maximum normal strain was carried out.The research results show that control effects of the displacement response and the node's maximum normal strain of the railway steel bridge with AMD while suffering different speed train load are obviously better than the LQR active control when using the robust control algorithm.