基于磁流变阻尼器的多单体组合隔震结构模糊控制研究

Study on combined multi-unit isolated structures with magneto-rheological dampers by fuzzy control

提出了一种新的组合结构振动控制体系——多单体组合隔震结构,建立了力学模型及运动方程。基于瞬时最优控制算法,将控制力表达成阻尼力的形式,用磁流变阻尼器充当控制器,运用模糊控制方法对其进行控制。通过计算机仿真分析,并运用LQR控制与之进行对比。研究结果表明,这种组合隔震结构体系的控制效果明显,各结构的地震响应都有明显降低。采用模糊控制不需要建立精确的计算模型,并能达到与LQR控制相接近的控制效果。用磁流变阻尼器充当控制器减少了能量输入,在结构2与结构3之间安装弹簧-阻尼器使控制更容易实现。

A new vibration-control system of combined multi-unit isolated structures was presented with its dynamic model and vibration equations established. Based on instantaneous optimum control algorithm,the control force was expressed in the form of damping force. Using fuzzy control method,this system was controlled by magneto-theological dampers. The control features were analyzed through computer simulation and the results were compared with LQR＇s. The conclusions suggest that the vibrationcontrol of this system is effective with earthquake responses declining visibly in every structure. At the same time,the fuzzy control doesn＇t need establishing accurate computation model but has an effectiveness contrast with LQR＇s. The energy input is reduced by using magneto-theological dampers as controllers and it is easier to set up spring-dampers between the second and the third structure.