【作者】 张平；

【导师】 杨敏；

【作者基本信息】 天津大学 ， 水利水电工程， 2010， 硕士

【摘要】 弧形闸门作为一种轻质薄壁结构,具有启闭方便省力等特点被越来越广泛的应用到水利工程中。但同时因为弧形闸门是薄壁轻质结构,在脉动水流荷载作用下容易发生流激振动,甚至会产生影响闸门安全稳定运行的不良后果,威胁水利工程的安全运行。因此,加强对弧形闸门流激振动特性的研究仍然十分重要。对弧形闸门流激振动的研究主要采用原型观测、水弹性模型试验以及结构有限元软件模拟等方法。以往对弧形闸门的研究仅仅孤立的研究弧形闸门,然而,这样忽略了弧形闸门、闸墩以及溢流坝之间的相互影响,同时忽略了相邻多孔闸门同时运行时,相邻闸孔闸门之间的相互影响。因此本文结合广东乐昌峡水利枢纽工程溢洪道弧形闸门,利用水弹性模型试验以及数值模拟的方法对溢流坝弧形闸门—闸墩耦合以及相邻闸孔闸门闸墩耦合条件下体系流激振动特性进行计算研究。主要内容如下:(1)结合乐昌峡工程项目,根据水弹性模型试验的原理以及要求,选择合适材料制作弧形闸门水弹性模型进行试验,并且对试验所测的闸门荷载特性以及闸门流激振动试验结果进行分析。(2)分别对弧形闸门自身以及溢流坝弧形闸门—闸墩体系进行数值模拟,并分别进行动力计算,将耦合体系计算结果与水弹性模型试验结果相互印证,并与闸门自身模拟计算比较,分析差异。(3)对相邻多孔闸门联合运行条件下闸门之间以及闸门与闸墩之间相互作用进行模拟计算,研究相邻闸孔闸门闸墩耦合流激振动特性。(4)对流固耦合等不同条件下闸门自振特性、不同结构型式对闸门时均响应以及脉动响应影响情况等进行研究。更多还原

【Abstract】 As a lightweight structure, the radial gate is widely applied to water conservancy projects because of its merits such as, low lifting force , easy opening and closing, and convenient operation etc. But, at the same time, because the radial gate is a thin-walled structure, the flow-induced vibrations are possible, which even leads to the negative consequences of the safety and stable operation of the gate, and the threat to safety operation of the hydraulic engineering. Therefore, we should strengthen the study of the flow-induced vibration characteristics of radial gate. And it is still important. The methods used to study the flow-induced vibration of the radial gate are prototype observation, hydro-elastic model experiment and the Finite Element Software ANSYS. Previous studies on the radial gate was only about isolated gate, however, it ignores interaction among gate, pier, and the spillway, and ignores the interaction between the gate and the adjacent gate when porous gate operating.Therefore, in this paper, taking the Guangdong Lechang Hydraulic Project as an example, using hydro-elastic model experiment and Finite Element Software to research the characteristics of the flow-induced vibration coupling the spillway radial gate and gate pier and coupling the adjacent gates and piers. And the main studies are as follows:(1) A hydro-elastic model of Lechangxia was developed on basis of its simulation theory and testing requirement. And the dynamic loads characteristics and results of flow-induced vibration were analyzed.(2) A three-dimensional finite element model for the radial gate and at the same time another three-dimensional finite element model for the system of spillway, radial gate and the gate pier were established using the finite element software, according to the size of the radial gate. Then the natural vibration frequency was calculated, and the effect of the fluid-structure coupling on its natural vibration property was also analyzed. And the result of the numerical calculation about the radial gate was contrasted with the system of spillway, radial gate and the gate pier. and the finite element calculation results was confirmed by the results of hydro-elastic model test.(3) The characteristics of the flow-induced vibration and the interaction of the gates and piers were studied using the numerical calculation when porous gate operating. (4) Using the method of numerical calculation, we studied the vibration characteristics of the radial gate under the conditions of fluid-structure coupling and different panel thickness and different types of gate arm. Furthermore we studied the factors of the gate’s static stability and dynamic Stability.更多还原