工程结构地震响应模糊半主动控制

Fuzzy semi-active control for civil engineering structure by using magnetorheological dampers subjected to seismic excitation

提出了使用MR阻尼器(M agnetorheological Damper)作为控制设备,模糊集为基础的半主动控制算法,并运用提出的算法对土木工程结构地震响应进行了振动控制分析。本文方法的优势在于算法自身的鲁棒性、处理非线性问题的能力和不需要结构的精确数学模型,算法需要的输入变量少,可以解决实际工程中结构响应信息难以测量的困难。模糊算法的输出直接控制MR阻尼器的输入电压,控制器的计算非常简单且易于在工程中实现。本文以一个3层框架结构为算例,分析了本文算法与前人研究算法的异同。数值结果表明,本文提出的模糊半主动控制具有较高的效率,可以减小需要的控制力,充分使用了MR阻尼器的输入电压可以调节的功能,使MR阻尼器的功能得到了更好的发挥。

A semi-active control strategy, in which the MR dampers （magnetorheological dampers） are used as an actuator, is presented based on the fuzzy set theory. The vibration control effectiveness is analyzed for civil engineering structure subjected to seismic excitation. The proposed method has some advantage of an inherent robustness, and easiness to handle the nonlinear characteristics of the structure, because there is no longer the needs for an exact mathematical model of the structure, and need to know few input variables from the vibration sensors that will deal with the difficulty of testing response information of the structure vibration. The output of the present method is directly input to the MR damper as the input voltage and the fuzzy logical controller can be easy evaluated in the real civil engineering structure. As a numerical example, a three floors frame structure is analyzed subjected to EI Centro earthquake adopting the present method and other previous methods respectively for comparison. The research results demonstrate that the present method can get better effectiveness than both of the passive off and Passive on control, and almost the same effectiveness as LQR-clipped strategy and has very good efficiency to reduce the seismic vibration response. However, the control force of the present method is smaller than the LQR-clipped method. It means that the proposed strategy can promote the efficiency of the MR dampers.