利用模糊控制器确定磁流变半主动控制结构的参数

Determination of parameters of magnetorheological semi-active control structures by using fuzzy controller

为了瞬时而准确地确定磁流变半主动控制结构的控制电流 ,有效地减小受控结构的动力反应 ,采用了模糊控制器确定磁流变阻尼器的输入电流 .以地震加速度激励和结构位移反应为输入 ,以控制电流为输出 ,根据抗震规范和实际经验合理地设计模糊控制器 ,采用模糊控制器所确定的电流对建筑结构实施半主动控制 .通过对一个 3层钢筋混凝土结构进行实例分析 ,并与双态控制结构和未控结构进行对比研究可以得到 :在模糊控制中 ,无论是对于位移反应还是加速度反应都比双态控制好 ,而且有效地避免了小激励时的动力反应放大问题 .

In order to determine the control currents of magnetorheological semi-active control structures quickly and accurately, and reduce the dynamic responses of controlled structures effectively, fuzzy controller is adopted to determine the input currents of magnetorheological damper. Taking earthquake acceleration excitation and structural displacement responses as inputs, and treating controlled current as output, fuzzy controller is designed reasonably according to seismic code and practical experience. Then structures are controlled semi-actively under the controlled current determined by fuzzy controller. Through a numerical example of a three-floor reinforce concrete structure, and a comparison with bi-state controlled structure and uncontrolled structure, it can be concluded that both displacement responses and acceleration responses of fuzzy controlled structure are reduced more effectively than those of bi-state controlled structure, moreover, amplification of dynamic responses during minor excitation can be avoided under fuzzy control.