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INFLUENCE OF TIME-DELAY ON ACTIVE CONTROL FOR BRIDGE AND TIME-DELAY COMPENSATION
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摘要: 桥梁减震主动控制系统中会存在一系列时滞因素,为了探讨时滞对桥梁主动控制效果的影响规律和时滞补偿方法,建立桥梁的有限元模型和减震控制方程,并考虑控制系统不同的滞后时间,对一座大跨连续梁桥进行了主动控制地震反应数值计算分析。结果表明,时间滞后会使桥梁主动控制系统的减震效果随着滞后时间的增大而越来越差,甚至会使地震反应发散;采用移相法对桥梁主动控制时间滞后进行补偿可以取得很好的控制效果,桥梁绝大部分地震反应在时滞补偿后的减震效果能够接近无时间滞后的理想情况的减震效果,有的甚至超过理想情况的减震效果。Abstract: There are some time-delay factors in the systems of active control for bridge.In order to explore the influence laws of time-delay on active control effect for bridge and time-delay compensation method, the bridge finite element model and the seismic mitigation control equation are set.With different lag time of control system, the active control seismic response calculation and analysis for a long-span continuous beam bridge are performed.The results indicate that time-delay can make the vibration-suppressed effectiveness of bridge active control systems worse with lag time longer.It can even make the seismic responses instable.Phase compensation for time-delay of bridge active control can get good control effect.The vibration-suppressed effectiveness of most seismic responses for the bridge with time-delay compensation can be close to the vibration-suppressed effectiveness without time-delay, and some can even exceed the vibration-suppressed effectiveness without time-delay.
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