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Seismic Response Control of the Structure with Smart Mitigation System Using Magnetorheological Fluid Dampers Based on Optimizing Fuzzy Control Rules

Sun Xin;Ding Jian-guo;Zhu Wei;School of Sciences,Nanjing University of Science and Technology;School of Energy and Power Engineering,Nanjing University of Science and Technology;  
Because the structures with semi-active control system using magnetorheological fluid dampers are influenced by nonlinear and time-varying factors,a precise mathematical model is difficultly established. Although the fuzzy control is an adaptable control method, the design of fuzzy control is easily affected by human subjectivity so that it becomes imperfect and affects control effectiveness. In this paper,a new control algorithm in which fuzzy control rules are optimized by a genetic algorithm is proposed. A three-story reinforced concrete structure with magnetorheological fluid dampers is studied by numerical simulation,and both the displacements and accelerations at the top of the structure without the control,with the fuzzy control and with the optimized fuzzy control by genetic algorithm are analyzed under the actions of earthquakes. The results show that the optimized fuzzy control by genetic algorithm may evidently improve the control effectiveness on displacement and acceleration responses at the top of the structure,compared with the fuzzy control as the design of human experiences.
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