Research On Mechanical Model And Seismic Control Of Electromagnetic Inertia Mass Damper

Under the external loads such as earthquake and typhoon,the civil engineering structure will produce violent vibration,the structural safety performance will be reduced,and people's life safety will be threatened.In order to control the vibration caused by various dynamic loads of civil structures,dampers with damping function are widely used,which can effectively control structural vibration and achieve the purpose of earthquake prevention and disaster reduction.Among them,the traditional electromagnetic damper has many advantages,such as simple structure,wide operating frequency,good performance,and so on.It is widely used in civil engineering,bridge,automobile and other fields.In this paper,a power amplification can increase the inertial mass flywheel based on traditional electromagnetic damper,this paper presents an electromagnetic rotating inertia mass damper model(Electromagnetic inertia mass damper,EIMD),to reduce structural vibration at the same time,a waste of mechanical energy into electrical energy.The electromagnetic mass damper is mainly composed of ball screw,inertia flywheel,motor and other components.Under the external excitation,the main structure produces a linear vibration,and the ball screw is converted into a rotating motion through the damper,and then the motor is rotated to generate electricity.Finally,the inertia force of the high-speed rotating flywheel and the variable electromagnetic damping force generated by the motor are used to achieve the purpose of structural vibration control.In this paper,two methods of MTS test machine and Matlab simulation are used to analyze the vibration response of the electromagnetic rotating inertia mass damper to the inter story displacement and acceleration of the main structure.The subject of this paper is the National Natural Science Foundation of china:(1)The research background and current situation of electromagnetic damper used at home and abroad are introduced,and the significance and Prospect of the research on electromagnetic rotating inertia mass damper are clarified.(2)The design idea,operation principle and feasibility analysis of the electromagnetic rotating inertia mass damper designed in this paper are discussed.(3)Through the MTS material testing machine,the electromagnetic rotating inertia mass damper was tested,the test data were drawn,the hysteresis curve of force and displacement was drawn,and the mechanical characteristics were analyzed.(4)A mathematical model of mechanics is put forward,and the model is calculated and deduced.The theoretical model and experimental data are fitted,and the accuracy of the mathematical model is analyzed and verified.(5)The dynamic model of electromagnetic inertia mass damper and three story frame structure is established.Through Matlab simulation analysis,it is proved that the system can realize dual functions of structural vibration reduction and energy recovery under different seismic wave responses.