流激巨型浮体扇形闸门的振荡  

Flow-induced large floating sector oscillations

作　　者：阎诗武 

机构地区：[1]水工研究所

出　　处：《水利水运科学研究》1992年第4期339-345,共7页

摘　　要：水工试验发现,在一定的泄流条件下,巨型浮体扇形闸门产生大幅度谐和振荡。本文通过一分析模型,分析了闸门结构系统垂直振荡与转动振动的自振周期。并在分析动水作用力的基础上,建立了闸门振荡与水面波动的耦合方程。闸门振荡与水面波动形成自激系统,在一定条件下,由于闸门的附加刚度的增大而导致失稳。Harmonious oscillations with large amplitude are discovered on the box-shape floating sector gate in the scale model. At first, the characteristics in construction and kinematical study of the gate structure are analysed. The period of vertical oscillations of the gate structure system are calculated by means of an analysis model. The calculating results are in agreement with the values of tests. Then, the equation of motion of fluid flow is found. The average pressure coefficients of the bottom of gate are calculated with testing data. Its experimental formulas are set up. At last, the equation of couple motion between the oscillations of the gate and the wave of water level is found. Under the appropriate conditions, the stability of the gate structure system shall loss while the added dynamic stiffness is larger than the stiffness of the gate structure system. The critical curve of the system stability for different sizes shapes of thebottom of the gate and river bed are calculated. The calculating results are in agreement with the values of tests. Two ways to modify the work condition of the system and which scheme is better are pointed out.

关 键 词：扇形闸门 垂直振荡 巨型箱式 

分 类 号：TV34[水利工程—水工结构工程]