一种对高层建筑振动半主动控制的新策略

New semi-active control strategy for vibration suppression of high-rise building

为了解决调谐质量阻尼器(TMD)的有效工作频域较窄和主动质量阻尼器(AMD)的控制力存在时滞效应的问题,提出在TMD中嵌入磁流变阻尼器(MRD)的新型半主动控制装置——TMMRD。采用模糊控制器取代传统滑动模态控制(SMC)的不连续'开关'式控制和等效控制的不确定性规则,基于Lyapunov函数设计自适应模糊控制律,结合改进的限幅最优(MCO)控制算法提出适合TMMRD的自适应模糊滑动模态半主动控制(ASMC/MCO)策略。运用TMD被动控制、ASMC/MCO半主动控制、ASMC主动控制和线性二次型高斯(LQG)主动控制分别对一座30层钢框架结构进行地震响应分析。研究结果表明:提出的ASMC控制策略的鲁棒性明显优于LQG;ASMC/MCO控制和ASMC控制下的减震效果明显优于TMD控制和LQG控制;ASMC/MCO的半主动控制力与ASMC的主动控制力吻合很好。

A new semi-active control device TMMRD, which was constructed by embedding the magneto-rheological damper （MRD） into tuned mass damper （TMD）, was proposed, in which the problems of both narrow frequency-domain of effective work in TMD and time-lag of control force in active mass damper （AMD） could be solved well. The discontinuous switching type of control laws of traditional sliding mode control （SMC） and uncertainty terms of equivalent control were replaced by fuzzy controller, the adaptive fuzzy control law based on the Lyapunov function was designed, the adaptive fuzzy sliding mode control （ASMC） was integrated with a modified clipped optimal （MCO） control algorithm, and then the semi-active control strategy ASMC/ MCO for TMMRD was proposed. The seismic responses of a 30-storey steel frame structure with TMD, ASMC/ MCO semi-active controller, ASMC active controller and linear quadratic Gaussian （ LQG） active controller were computed, respectively. Computation results indicate that the robustness of ASMC controller is obviously superior to that of LQG controller. The reduction effects on seismic responses under ASMC/ MCO control and ASMC control are obviously supe-rior to those of TMD control and LQG control. The control force of ASMC/ MCO controller is almost the same as that of ASMC controller.