Analysis On Vibration Control Of Tower Stucture

Tower structures are mostly high-rise structures,with low horizontal stiffness and significantly dynamic response under load.So vibration control of wind and seismic waves becomes an important part of tower structural design and hotspot in the field of vibration control.In this paper,the vibration damping device is designed and manufactured.Through numerical simulation and shaking table test of the tower model,the dynamic response of the top floor of the tower with or without TMD is calculated.The analysis results are applied to a wind turbine structure in Shandong province as an example,the vibration damping device is installed on the top of the tower to control the vibration.Finally,the vibration damping device is optimized,and the vibration reduction effect of various dampers on the tower under the action of the same seismic wave is studied by shaking table test.The main contents and conclusions are as follows:1.A small tower model is designed,and a 3D model is built by using ABAQUS finite element software.The modal analysis shows that the first-order natural vibration frequency of the tower is 13.6Hz.Install the TMD device and compare the dynamic response of the top floor of the tower with or without TMD.Numerical simulation shows that the TMD device can obviously reduce the dynamic response of the tower and has a certain damping effect.2.The model was made of stainless steel,and the shaking table test was carried out to test the natural vibration characteristics and dynamic response of the tower.The error between the first order natural vibration frequency and the numerical simulation results is only 4.99%.The dynamic response test shows that the vibration intensity of the tower top can be significantly reduced after TMD is installed,and the closer the external load frequency is to the natural frequency of the tower,the better the vibration reduction effect will be.Under the action of three kinds of seismic waves,the damping rate can reach 20%~60%.3.On the basis of the above tests and analysis,the tuned mass damper is optimized,and liquid,ball,liquid and ball are added into the mass block cavity respectively.Through the shaking table test,the damping effect of various types of dampers under the action of the same seismic wave is studied.The test results show that the vibration reduction rate of the four dampers can reach 20%~60%,no matter the peak value or the root mean square value,among which the TL-PD damper has the best effect.4.Taking a wind turbine structure in Shandong province as an example,the vibration responses of the structure under four TMD layout schemes are compared.According to the calculation results,TMD has a good control effect on the wind-induced vibration response of the wind turbine structure,in which the acceleration control effect is the best(53.83%),followed by the velocity and displacement.At the same time,when the effect of low-order mode is large and the high-order mode is not considered,the control effect will be reduced when a large TMD is decomposed into several small mass TMD.