Research On Optimization Of Damper Setting In Frame For Tower-type Gasification Equipment With Large Scale

Tower structure is the indispensable primary equipment in modern petrochemical processes such as petroleum refining,natural gas chemical engineering and environmental engineering.Most of the towers are towering,towering and high flexible structures.Because the process needs to be often in the outdoors,it is easier to produce vibration under external loads such as earthquake load and wind load.So the frame tower is often used to support the tower to control the deflection of the top of the tower through a frame.The dynamic characteristics of the frame tower structure are generally calculated by the finite element analysis.The model is complex and takes a long time,and it can only analyze the vibration frequency of a frame tower structure,and the form is single.Based on the large super tall frame tower,the frame is directly connected with the tower or connected by damping.Based on the beam perturbation theory,the free boundary condition at one end of the frame tower is fixed at one end,and the modal equation is established,and the characteristic equation of the structure’s self vibration frequency omega is obtained by using the transfer matrix method.The characteristic equations for calculating natural frequencies under common boundary conditions are discussed,and the natural frequencies of lateral vibration under common boundary conditions are obtained.The influence of elastic support stiffness,support position and damping parameters on the natural vibration characteristics of the tower is studied.Parameter optimization is carried out to study the change law of the structure vibration frequency under the parameters change,and the stiffness coefficient,damping coefficient and support position of the frame tower have the greatest vibration frequency.The research results provide a theoretical basis for the design calculation and engineering cost of large frame towers.The finite element method is used to analyze the time history response of the simplified model under the excitation of EL-centro and Taft waves.