大型翻板闸门抗波浪振动的主动控制

Active anti-wave vibration control of large-scale flag gate

以单跨为102 m的苏州河河口大型翻板闸门为例,探讨了在台风风浪作用下闸门扭转振动妨碍正常使用和影响结构安全性的问题.通过求解半解析解获得了部分入水翻板闸门在液固耦合下的扭转振动模态,并得出了该模态与上、下游水位的关系,结构模型试验验证了该解的合理性.建立了该结构扭转振动控制机理,根据港口工程常用的风浪谱,基于随机最优控制方法,仿真求解了结构控制前后的振动响应.结果表明,该模态控制方法及其控制点的设置能够大幅度降低扭转振动幅度,从而提高了结构的安全性能.当随机载荷的能量集中在某个模态附近时,该方法更易于实施.

The span of flag gate in Shuzhou river reaches 102 m,which is the biggest in the world.The vibration under wave action during storms will disturb gate s normal function and affect its structure safety.To avoid this result,this work studied the vibration modal of flag gate with solid-liquid coupled action by semi-analytic solution firstly.Theoretical model considered the attached mass effect and the torsion vibration modal shape function.The modal frequency formula relies on the upriver or downriver water le...