桥梁抗震主动控制的稳定性研究

主动控制应用于实际结构 ,需要考虑其控制效果的稳定性问题 ,为此 ,分析了桥梁抗震主动控制中可能出现的计算模型误差和系统误差 ,并讨论了应用H2 控制和H∞ 控制两种算法的稳定性。理论分析和仿真计算表明 ,在频谱特性不同的地震激励下 ,H2 控制和H∞ 控制两种算法都可以取得满意的控制效果 ;对于计算模型误差 ,H2 控制和H∞ 控制两种算法的鲁棒性相当 ,控制效果稳定 ;对于系统误差 ,H∞ 控制算法比H2 控制算法鲁棒性强 ,在较大的误差下可以保持控制效果的稳定性

Study on Stability of Anti-seismic Active Control of Bridge

Errors of the calculation model and the control system occurred in the course of anti-seismic active control of bridge is analyzed. The stability calculated by H 2 and H ∞ control algorithm is studied respectively. The theoretical analysis and simulating results show that both H 2 and H ∞ control algorithm could provide satisfied control effects under earthquake excitation with different frequency characteristics. The robustness of the control effect is almost the same when the errors of calculation model occurred and the control effect maintained stable under possible errors. The robustness of the control effect calculated with H ∞ control algorithm is stronger than that by H 2 control algorithm under the control system errors. The stability of the control effect might be maintained under relatively larger system errors.