Research On Flow-Induced Vibration Of Low Head Hydraulic Tainter Gate

A hydraulic tainter gate is mainly used for controlling flood and is one of the most important structures for dam safety. The engineering projects show that tainter gates have vibration of different degree caused by water flow action during gate operation in dynamic water or gate partial opening. In some specific conditions, some gates had stronger vibration, and few ones had resonance and hydraulic instability. It is of great signification for instructing tainter gate design to study mechanism of gate flow-induced vibration, discuss rule of gate vibration and give out controlling criteria. At present, as to gate complex structure, the relationship between water flow dynamic action and gate vibration has not been known clearly, it is still in primary stage for gate vibration study in the world. In China, the prevailing standard adopts dynamic coefficient method and defines dynamic coefficient by water flow condition and gate type. It is an approximate method for considering vibration effect.The purpose of the paper is to study flow-induced vibration of low head hydraulic tainter gate of Shifoshi Reservoir, Liaoning Province. To meet the requirement of engineering forecast, some parts of the paper is extended, belonged to academic discussion. The paper summarizes the past research on hydraulic tainter gate, states the research history and development of gate flow-induced vibration from the aspects of vibration source, vibration mechanism, numerical simulation forecast, physical model forecast and prototype observation. Combining tainter gate design of Shifoshi Reservoir, the paper goes into the vibration mechanism and property of tainter gate, studies free vibration and forced vibration, self-induced vibration and paramgtric resonance respectively, and gives out quantitative analysis methods and results. The main research contents of the paper include:1. To forecast the forced vibration property of tainter gate under the action of water flow pulsating loads. The selected technical route is: to record synchronously the water flow pulsating loads acted on facial pulsating pressure sensors (FPPS) on tainter gate face plate with a hydraulic model only meeting the law of gravity similitude, and then to determine gate dynamic response with structural analysis software. The pressure-bearing faces of FPPS correspond to the elements of gate face plate FEM structural dynamic calculation. Thus, forced vibration forecast includes face pulsating pressure measurement and structural...