Theory and Experiment on Semi-active Control of Seismic Responses of Adjacent Buildings Using MR Dampers
|Keywords||Magnetorheological damper Semi-active control Acceleration feedback Control over the amplitude Adjacent structures Shaking table test|
Magnetorheological (MR) damper as a new semi-active control devices, has the advantages of simple structure, fast response speed, continuously adjustable damping force. MR damper-based semi-active control system can effectively control the seismic response of the structure. Building seismic response on the application of MR dampers adjacent semi-active control of the experimental and theoretical study, the main research work and achievements are as follows: (1) different amplitude and different frequency sine wave excitation, applying different excitation current MR damper dynamic performance of the tests. Modified sigmoid model of MR damper, the model expressions simple, unambiguous, fewer parameters, its parameters can be flexible modifications to be able to accurately describe the dynamic characteristics of the MR damper damper test curve. (2) based on the characteristics of the Kalman filter to extend the acceleration feedback method applied to the IOC, COC and LQR algorithm. The numerical analysis shows that the acceleration feedback method based on a different algorithm does not require accused of structural response can achieve full state feedback the original control algorithms accused structure control effect. The description of this method can reduce the number of sensors in the control system, to reduce the cost of the control system hardware and software, adapted to the actual engineering applications. (3) based on the amplitude of the MR damper control, the impact of the the charged structure control effect, pointed out that the optimized control the amplitude design of manufacturing MR dampers. The calculations show that, when the control amplitude reaches a certain value, the the accused structure control to enhance the effect slowly, with smaller amplitude of the MR damper control to achieve the desired control effect. Control over the amplitude will be used as the basis for the design and manufacture of the MR damper control over the amplitude manufactured in accordance with the optimized damper volume is smaller, lighter, and less MR fluid demand to facilitate the MR damper in the practical application of engineering in the setup, installation and commissioning. (4), respectively, of the semi-active control, switch control, and two passive control method, the MR dampers adjacent structural seismic response control effect simulation calculation. The calculation results show that the MR damper semi-active control system based on control of the adjacent structure the four control method is best, semi-active control method takes into account the characteristics of the MR damper control continuously adjustable output range full play to the performance of the MR damper, the pair of adjacent structures is a very effective control method. (5) under different seismic excitation using two passive control and three acceleration feedback control method, the application of MR damper dynamic table test of shaking of the adjacent structure model. The test results show that the MR damper based semi-active control system can effectively reduce the vibration response of the model structure, to take full advantage of the performance of the MR damper semi-active control system to achieve better control effect on adjacent structures. And three kinds of acceleration feedback method requires only the acceleration response of the structure as feedback, greatly reducing the number of sensors in the test, the semi-active control is more easily applied to actual projects.