Parameter Optimization And Experimental Research On Vibration Reduction Of Structures Of Double Electromagnetic Shunt Tuned Mass Damper

Under the excitation of earthquakes,strong winds,vehicles and other external forces,civil structures are prone to large vibrations,especially high-rise buildings and long-span bridges,which will cause structural fatigue and damage,further reduce safety and comfort,and reduce service life.Among them,tuned mass damper(TMD)is one of the more common and efficient structural vibration control techniques.This paper will use electromagnetic damping elements to replace the viscous damping elements in traditional tuned mass dampers,and design an electromagnetic shunt tuned mass damper(EMS-TMD)that combines the dual functions of structural vibration damping control and energy harvesting.In order to improve the damping performance and robustness of the damper,the concept of inertial mass was introduced,and the parameter optimization and simulation analysis of a new dual TMD system were proposed and carried out,and compared with traditional parallel double tuned mass dampers(DTMD).Finally,the relevant EMS-TMD vibration reduction experiments are carried out to verify the accuracy of the conclusions.The research content and work mainly include:(1)The main control technologies and measures for suppressing structural vibration are reviewed,and the research progress and status quo of many scholars such as tuned mass dampers,electromagnetic dampers,and inertial mass are briefly discussed,and the research object and significance of this paper are clarified.(2)The basic structure and working principle of double electromagnetic shunt tuned mass dampers(DEMS-TMD)are summarized.Based on this,the vibration reduction scheme of DEMS-TMD system is designed,in which the controlled structure is regarded as a single degree of freedom Structures(SDOFs).The dynamic model of the coupled vibration reduction system of DEMS-TMD and SDOFs under the action of earthquake and random wind is deduced.Then,the maximum value of the dynamic amplification factor of the main structure displacement is taken as the objective function,and the particle swarm optimization method is used to optimize the parameters to obtain the optimal numerical solution of DEMS-TMD.Finally,the vibration reduction and energy harvesting performance of the DEMS-TMD system is studied by two numerical methods in the frequency domain and the time domain.(3)The concept of inertial mass is introduced,and its two ends are connected to TMD and ground respectively,and a vibration reduction scheme of double electromagnetic shunt tuned mass-inerter dampers(DEMS-TMID)is designed.The dynamic model of the coupled seismic isolation system of DEMS-TMID and SDOFs is established by the same method,and the transfer function of the displacement of the main structure is deduced.Then,using particle swarm optimization algorithm,the optimal parameters of DEMS-TMID are obtained respectively.Finally,the vibration reduction and energy harvesting performance of the DEMSTMD system is studied by two numerical methods in the frequency domain and the time domain.(4)The displacement response of the main structure of the EMS-TMD system is obtained by numerical simulation under free vibration and simple harmonic loads.The EMS-TMD vibration reduction test was designed and carried out,and the vibration reduction performance of the EMS-TMD was verified by comparing it with the simulation results.