Study On The Coupled Dynamic Characteristics Of Radial Gate And The Pier Of Bottom Outlet Flood Discharge And Its ARM Optimization

The hydraulic radial gate was an important water retaining and dischargestructure, and its safety was vital to the whole hinge. But the radial gate is athin-walled structure, and the vibration of the radial gate is prone to be induced bydynamic water pressure. So it is very necessary to study the dynamic characteristic ofthe radial gate. The panel of the gate withstands the dynamic water pressure andpasses it to the pier through the arm and the hinge, so vibration of the gate isinfluenced by water and the pier. The vibration of the gate differs under differentdischarge conditions, such as submerged discharge and free discharge, so radial gate’svibration is a complex flow-induced problem. The results of physical experiments andnumerical calculation can be compared with each other and ensure the correctness ofboth. Therefore, the flow-induced vibration response simulation of gate throughmodel experiment and numerical model was an effective method of researching gatevibration problem.In this paper, the dynamic characteristic of radial gate is studied through physicalexperiment and numerical calculation combined with the working gate of Lidihydropower station’s discharge bottom hole in Lancang River. The main studies are asfollows:(1) The hydraulic model and hydro-elastic model were designed by a certaingeometric scale using suitable hydro-elastic material according to the physical modelexperiment requirements, then, the gate load and response of dynamic stress anddisplacement of flow-induced vibration of the gate were tested. The results offlow-induced vibration were analyzed.(2) The water-gate-pier coupled numerical model were established using finiteelement software ANSYS. The results of physical experiments and numericalcalculation were compared with each other and verified the correctness of both. Thenthe respective impact of water and pier on vibration of gate were analyzed throughcomparisons between the calculation results of water-gate-pier coupled numericalmodel, gate-pier coupled numerical model and the calculation results of gate model inwhich the pier was treated as rigid constrain.(3) The vibration characteristics of radial gate and the gate pier were studied undersubmerged discharge and free discharge conditions through gate-pier-hanger rodhydro-elastic experiments. (4) The impacts of oblique and lateral connections department both on static anddynamic characteristics of the arm and gate stiffness were studied by static anddynamic analysis of gates of different forms of arms. Finally, a form of armoptimizations was identified which not only met the static and dynamic stabilityrequirements, but also reduced the radial gate fabrication and operation costs.