Study On Flow Induced Vibration Characteristics Of Plane Steel Gate

Water conservancy project construction is an important part of national infrastructure construction.As an important part of water conservancy projects,plane steel gate is commonly used in various water conservancy facilities.Its safe and stable operation directly affects the safety of water conservancy facilities and surrounding residents’ lives and property.Vibration has always been an important factor endangering the safe operation of the gate.In extreme cases,vibration may lead to the damage of the gate structure and lead to major safety accidents in water conservancy projects.Therefore,it is of great significance to study the flow induced vibration of plane steel gate for the safety and stability of water conservancy projects.Based on the Workbench platform in the finite element analysis software ANSYS and combined with a water conservancy project of a tributary of the Yellow River,this paper studies the flow-induced vibration of the working gate and the characteristics of the flow state under the gate,so as to provide reference for the design and management of water conservancy projects.The main research contents and conclusions of this paper are as follows:(1)The research status of gate vibration,fluid-structure coupling and computational fluid dynamics at home and abroad is summarized,and the basic theory of fluid-structure coupling and corresponding numerical analysis methods as well as multiple research directions of gate vibration are described,which provides a theoretical basis for the research process of the subject.(2)Using Solid Works software and engineering documents to establish a three-dimensional model of the plane steel gate,the fluid-structure coupling model of the gate and water body was established after imported into ANSYS software,and the dry mode and wet mode analysis of water in front of the gate were carried out respectively.The results show that the vibration frequency of plane gate with water is much lower than that without water,and the vibration frequency of each order increases with the increase of opening degree.(3)The RNG model is used to simulate the gate water area.Through numerical simulation,the water pressure cloud map and monitoring surface pressure data under the sluice are simulated completely,and the influence of the bottom edge configuration on the flow pattern is analyzed.The results show that only the flat-bottomed gate has negative pressure area directly below the bottom edge all the time,while the other three structures have no obvious negative pressure area,and the downward dip Angle moves around with time.According to the analysis of the characteristics of upper support and lower suction,it can be concluded that the upper support force increases with the increase of the upstream dip Angle,and the upper support force of the flat-bottom gate is negative,showing the characteristics of lower suction,and it’s easy to induce gate vibration.(4)Taking a water conservancy project in a tributary of the Yellow River as the research object,a set of dynamic response monitoring scheme of the gate is designed,so as to realize the real-time monitoring of the vibration of the planar steel gate.