考虑流固耦合的泵闸组合闸门结构自振特性研究

研究设计了一种新型泵闸组合闸门结构。为避免新型闸门结构低阶自振频率落在水流脉动荷载高能区内而引发共振,建立水体-泵闸组合闸门结构耦合模型,采用ANSYS软件分析结构的动力特性变化规律,分析了闸门上、下游水位及门体结构上潜水泵布置方案等因素的影响。结果表明:随着水位的升高和闸门开度的减小,结构自振频率显著降低;闸门的第一阶振型由沿竖向的整体振动,逐渐转变为面板顺水流方向的弯曲振动;水泵安装个数越多,泵闸组合闸门结构自振频率越低,将水泵集中布置于门叶中部时有利于均衡结构各部位的振动特性,可为该新型泵闸组合闸门结构的设计提供依据。

Research on Natural Vibration Characteristics of Pump-gate Combination Gate Structure Considering Fluid-structure Interaction

A new type of pump-gate combination gate structure is studied and designed in this paper.In order to avoid the low-order natural frequency of the new gate structure falling in the high-energy region of the flow load and thus causing resonance,a coupling model of the water body and the pump-gate combination gate structure is established by ANSYS software to analyze the dynamic characteristics of the structure,and explore the influence of factors such as the water level in upstream and downstream of the gate and the arrangement of submersible pumps on the door structure.Analytical results show that with the increase in water level and the decrease in gate opening,the natural vibration frequency of the structure decreases significantly;the first-order mode of the gate is changed from the whole vibration along the vertical direction to the bending vibration of the gate panel along the direction of water flow;the natural vibration frequency of the pump-gate combination gate structure decreases with the increase in the number of pumps installed.Besides,the water pumps should be concentrated in the middle of the door leaf to make the vibration characteristics of each part more balanced,providing basis for the design of the new pump-gate combination gate structure.