The Structural Vibration Control Experiment And Numerical Simulation Of Base-isolated Structures With MR Dampers

In recent years,the research on structural vibration control has developed considerably.Structural control is divided into active control,passive control and semi-active control,in which semi-active has both the reliability of passive control system,but also has strong adaptability of active control system,through a certain algorithm can achieve the effect of active control,what's more,it has simple structure and low energy requirements.So,semi-active control has become a hot area of research in structural vibration control.There are many semi-active control devices, in which,magneto-rheological(MR) damper is a widely used semi-active control device which has simple body,fast response,wide dynamic range,well durability, and the damping force can be reversible and tunable,it also easily combines with microcomputer control and has well damping effect.Large amplitude vibration will happen in superstructure under the earthquake especially major earthquake,and it will cause great damage.In order to reduce earthquake damage to the structure,a structure of two steel frame which sets a Magnetorheological Damper in the bottom will be researched,then using passive control,three semi-active control:fuzzy control,PD control and fuzzy PD control respectively to analyze seismic waves on the response of the upper part of the structure,then comparing with results between passive control and semi-active control and using SIMULINK toolbox to simulate and analyze seismic waves on the response of the upper part of the structure for testing the correspondency of experimental results.This paper makes a systematic study for the theory of semi-active control based on magneto-rheological damper.Firstly,this paper reviews the progress and status of MR damper and gives a comprehensive evaluation to semi-active control study based on magneto-rheological damper.Secondly,reaching the mechanical model of MR damper and comparing the advantages and disadvantages of mechanical models.The MR damper mechanical properties can be gotten by the experiment,then,Sigmoid model is used as the calculating model to prepare for the simulation.Thirdly,studying the theory of vibration control semi-active control algorithms.Fourthly,in different seismic waves and seismic intensity,the semi-active control effect and optimum passive control effect which have a MR damper are compared,contrasting with the upper structural response between semi-active control and passive control and verifying semi-active control effect is better than the optimal passive control under different seismic waves and different intensity of earthquakes.At last,using SIMULINK toolbox to simulate and analyze the three-story steel frame which is set a MR damper on the ground floor,then testing the correspondence between simulation and experimental results.