建筑结构基于模糊自适应调节趋近律的滑模控制研究

SLIDING MODE CONTROL WITH FUZZY ADAPTIVE REGULATION OF REACHING LAW FOR BUILDING STRUCTURE

抖振问题是阻碍滑模控制应用的主要障碍之一。基于模糊控制的优点,采用一种模糊自适应调节趋近律的滑模控制方法对地震作用下建筑结构的振动控制问题进行了研究。给出了确定切换面的方法,推导了控制律的表达式。另外,考虑到实际中在大型的建筑结构中安装过多的传感器来进行主动控制研究是不切合实际的,还研究了有限状态输出反馈下该方法的适用性。以一个多层剪切型建筑结构模型为例来验证所提出控制方法的有效性,算例分析结果表明,所提出的控制方法能够有效地减小结构的地震峰值响应,同时达到了削弱控制系统抖振的目的。

A new sliding mode control method involving fuzzy adaptive regulation of reaching law was presented for seismically-excited building structures.The excessive chattering effect-the major disadvantage of conventional sliding mode control methods,was avoided by introducing the new method without losing the robustness against parametric uncertainties.Considering that,for practical implementations of active control systems in large civil engineering structures,it may not be practical to install great number of sensors to measure the full-state vector,a static output feedback controller based on the new sliding mode control method was presented.In order to verify the feasibility and robustness of the proposed control method,numerical simulations were given for MDOF(multiple-degree-of-freedom)shear building model containing an active brace system.The simulation results show that the method is quite effective:it can reduce the peak-response of the ground motion,and keep the chattering effect sufficiently low so as to ensure the system stable.