时滞对桥梁主动控制的影响与时滞补偿
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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。
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 vibrationsuppressed effectiveness without time-delay,and some can even exceed the vibration-suppressed effectiveness without time-delay.
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 vibrationsuppressed effectiveness without time-delay,and some can even exceed the vibration-suppressed effectiveness without time-delay.
引文
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2孙清,伍晓红,戴红,等.结构振动半主动控制系统的时滞补偿研究.机械科学与技术,2005,24(5):505-509
3田石柱,李暄,欧进萍.结构主动控制系统时间滞后测量与补偿方法.地震工程与工程振动,2000,20(4):101-105
4 Soong T T.Active Structural Control Theory and Practice,LongmanScientific&Technical,UK,1990:1-122
5欧进萍.结构振动控制——主动、半主动和智能控制.北京:科学出版社,2003:1-540
6范立础.桥梁抗震.上海:同济大学出版社,1997:1-312
7丁皓江,何福保,谢贻权,等.弹性和塑性力学中的有限单元法.北京:机械工业出版社,1989:1-215
8胡聿贤.地震工程学.北京:地震出版社,1988:1-692
9徐龙河,周云,李忠献.MRFD半主动控制系统的时滞与补偿.地震工程与工程振动,2001,21(3):127-131
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