Research On Vibration Damping Performance And Position Optimization Of Electromagnetic Inerter Damper (EMID) In Structure

Around the natural environment in which we live,strong external winds,heavy rains,tsunamis,earthquakes,etc.have devastating external incentives for structures.Civil engineering structures are often prone to strong vibrations under these external excitations.Vibration can easily lead to damage to the structure,which affects the safety and comfort of the structure,while reducing the age of the structure.With the development of science and technology,more and more high-rise buildings,large-span bridges are increasing,and vibration control technology is becoming more and more important.Therefore,based on the traditional electromagnetic damper and inert damper,an electromagnetic inerter damper(EMID)composed of a ball screw mechanism,a rotating flywheel,a gearbox and a motor is proposed,it rotates the flywheel to achieve a mass amplification effect.It not only has the dual compounding effect of electromagnetic energy consumption and inerter,but also has the potential function of energy collection and semi-active control.Compared with the traditional electromagnetic damper,it is reducing.The performance of the earthquake has a better performance.The research source of this paper is based on the National Natural Science Foundation of China,and the electromagnetic inerter damper mechanical test and vibration reduction test,as well as position optimization simulation analysis.The main research contents and results are as follows:(1)The structural vibration control technology,electromagnetic damper,inerter and damper installation position optimization are introduced.The research status at home and abroad is clarified,and the research purpose and significance of this topic are clarified.(2)The basic structure and vibration damping principle of EMID are expounded,the mechanical model of EMID is established,and the mechanical experiment of EMID is designed and carried out.The effects of excitation frequency,excitation amplitude,inerter coefficient and electromagnetic damping coefficient on the mechanical properties of EMID are analyzed.(3)The equation of motion of EMID-structure coupling system is established.The vibration damping effect of EMID under free vibration is analyzed by numerical simulation.The model of EMID-structure coupling system is designed and the EMID free vibration damping test is carried out.(4)Based on the third chapter model,the vibration reduction test under EMID harmonic excitation is carried out,and the test results are compared with the simulation analysis results.(5)The dynamic model of the coupled system of EMID and multi-degree-of-freedom structure is established.Three optimization methods of genetic algorithm,iterative method and weight coefficient are used to optimize the EMID position of the ten-degree-of-freedom structure.The four evaluation indexes are used to compare the optimization results.After analysis,the ten-degree-of-freedom structure control EMID parameter variable analysis was carried out.