Analysis Of Static And Dynamic Characteristics Of Radial Gate With Compression Bar Arrangement

With the development of water resources,the requirements of safety and practicability of sluices are becoming stricter and stricter,and the stability of some large-scale sluices has attracted more and more attention of scholars.Radial gate is widely used in hydraulic structures because of its light structure,convenient operation and simple operation.However,there is often vibration phenomenon in the operation of the gate,which is very easy to cause structural dynamic instability and damage.In order to reduce the resonance damage of the radial gate,the optimization design and static and dynamic stability analysis of the radial gate become the key points of the gate structure research.In this paper,the static and dynamic characteristics of two types of radial gate are studied.First of all,this paper introduces the research progress of the optimization design and vibration of radial gate at home and abroad in recent years,analyzes the causes of the dynamic instability of the gate,and explains the ideas and methods of the static and dynamic characteristics analysis of the gate to be carried out in this paper.The basic concept and analysis steps of finite element numerical analysis method are briefly described.The application characteristics of ANSYS involved in the calculation and analysis of this paper are introduced.The modal analysis and harmonic response analysis theory of spatial elements of shell,beam and link used in static analysis and design in dynamic analysis are introduced in detail.The traditional arc steel gate improves the integral stiffness of the gate through the rational arrangement of the main frame,and improves the stability of the gate through the improved design of the arm.It has the advantages of reasonable transmission path,high bearing capacity,and can greatly reduce the calculated length coefficient of the arm and reduce the use of materials.Compared with the traditional two arms,three arm and multi arm structure,it is more safe and reasonable.In this paper,on the premise of using this kind of arm form,it is proposed to increase the overall rigidity of the gate by evenly arranging the compression bar on the flange of the arm and the longitudinal beam,and then increase the gate natural frequency,reduce the response value of the gate under the low frequency,so as to achieve the purpose of improving the static and dynamic stability of the gate structure.According to the operation mode and stress deformation characteristics of radial gate,the static and dynamic modal analysis and harmonic response analysis of the two types of radial gate are carried out by using the finite element numerical simulation method,and the relevant theories are introduced.The corresponding stresses and displacements of the panel,the transverse and longitudinal beams and the support arms under the hydrostatic pressure are calculated;The elastic-plastic mechanical analysis of the two types of gates is carried out and the results show that the stiffness and ultimate bearing capacity of the gate with compression bar arrangement are greatly improved;In the modal analysis of the gate,the natural frequency and the corresponding vibration mode are analyzed when the gate is closed without water;In addition,the response analysis of the gate under the harmonic load is carried out.The analysis results verify the effectiveness of the arrangement of the compression bar.The dimension design meets the specifications and the overall stiffness of the gate is improved.The stress and displacement of the gate are greatly reduced under the hydrostatic load.The natural vibration frequency of the gate is increased,and the response value under the simple harmonic load is reduced.