斜拉桥拉索的MR半主动控制研究

根据LQR最优控制理论,结合面向速度剪切(Clipped Optimal)控制算法及修正的磁流变(MR)阻尼器Bouc Wen模型,提出了LQR Clipped半主动控制算法,应用拉索振动的差分离散模型,对斜拉索的面内振动进行了被动、主动及半主动控制研究,分析了MR阻尼器对斜拉索的振动控制效果。研究结果表明:MR阻尼器被动控制能够提供的模态阻尼比可以达到最优油阻尼器控制的值,但MR被动控制存在一个最优输入电压,最优电压值与需控制的第几阶模态有关;与油阻尼器被动控制相比,MR半主动控制可以有效地提高模态阻尼比,尤其在阻尼器位置距索端很近时仍有较好的控制效果。

Research on MR semi-active control of cables in cable-stayed bridges

According to the LQR optimal control theory, clipped-optimal control arithmetic, and the modified Bouc-Wen model of the MR dampers, the LQR-Clipped semi-active control technique for suppressing vibration of stay cables in cable-stayed bridges is proposed. The passive, active, and semi-active control of the cables are analyzed by using the difference discretization model of the cable-dampers system. The control efficiency of MR damper is investigated. The results demonstrate that the efficiency of MR damper passive control is nearly same as that of the optimal oil-dampers passive control. But there is a optimal input voltage which correlates with the vibration model order when the MR passive control is used.However, the control efficiency of the MR semi-active control compared with that of the oil-dampers control is better,especially when the damper position is close to the end of the cable.