Study On Vibration Reduction Effect Of Semi-active Control Of Variable-stiffness System With Multi Degree Of Freedom Structure System

The variable stiffness semi-active vibration control is the variable stiffness control,which can adjust the total stiffness of the structure.In this paper,a seismic dynamic response analysis model of a 20-layer variable stiffness semi-active control structural system is established.The effects of vibration mitigation,including regulation and optimization,can be achieved by the equations of motion and vibration control according to adjust the stiffness coefficient.Specifically:1)Inputting five different seismic waves such as El-Centro wave,analysing the seismic response analysis under different seismic waves,the simple Bang-Bang and optimized Bang-Bang vibration control algorithm have better vibration mitigation effect in storey drift than uncontrolled,according to and the vibration mitigation effect can reach 53%,but there is no obvious vibration mitigation effect on the floor acceleration.2)By comparing the structural dynamic response curves of AMD active control and two methods of control algorithms,we can obtain the vibration mitigation effect,active control the best,next to simple Bang-Bang control algorithm and optimized Bang-Bang control algorithm the worst,respectively.However,considering the economic,feasibility and other factors,the cost-effectiveness of semi-active control will be higher,which is more in line with the actual project.3)Adjusting the value of the variable stiffness coefficient k_v and MATLAB numerical simulation,we can find that the structure in storey drift,floor displacement,floor velocity improved as the k_v value increases.Additionally,when k_v takes a value within a certain range(1000000<k_v<10000000),the vibration mitigation effect is greater,but the vibration mitigation effect on the floor acceleration is not obvious;Under the same parameter index k_v,the optimized Bang-Bang control algorithm requires similar control force,but slightly higher than the simple Bang-Bang control algorithm.As the parameter index k_v increasing,the required semi-active control force increases.Figure 47;Table 11;Reference 60.