大孔径下沉式双扉门方案布置及自振特性研究

Research on layout scheme and natural vibration characteristics of large-aperture sunken double-leaf gate

大孔径下沉式双扉门作为一类新型闸门,因其在关门挡水时处于悬停状态的特殊布置方案,可能造成关门时闸门在竖直方向变形过大而引起节间漏水以及因振动而失稳破坏。为选出受力最合理的闸门布置方案并了解其振动特性,运用材料力学基本理论计算方法,对下扉门3种挡水类型进行计算分析,并采用有限元分析软件ANSYS,考虑流固耦合作用,对下扉门及双扉门进行自振特性分析。研究结果表明:闸门采用全封闭,内部空腔注水,且闸门门底承受内河侧水压力的布置方案最为合理;所选方案闸门自振频率较低,流固耦合作用下闸门的自振频率降低明显,有引发共振失稳破坏的风险,应根据实际情况对闸门进行加固。该研究可为类似闸门的布置及后续加固措施提供参考。

As a new type of gate,the sunken double-leaf gate with large aperture is suspended when the gate is closed and water is blocked,which may cause internode leakage due to excessive deformation of the gate in the vertical direction and vibration instability damage.In order to select the most reasonable arrangement plan of the gate under stress and understand it's vibration characteristics,three types of retaining water were calculated and analyzed by using the basic theory calculation method of material mechanics,and the finite element analysis software ANSYS was used to analyze the natural vibration characteristics of lower door and double door considering the fluid-structure interaction.The results show that the gate is fully closed,the inner cavity is filled with water,and the arrangement scheme of the gate bottom bearing the water pressure of the river side is the most reasonable.In the selected scheme,the natural vibration frequency of the gate is relatively low,and the natural vibration frequency of the gate is obviously decreased under the action of fluid-structure interaction,which may cause the risk of resonance instability and failure.Therefore,the gate should be strengthened according to the actual situation.This study can provide reference for similar gate layout and later reinforcement measures.