相邻结构地震反应MR阻尼器控制的仿真分析

本文仿真分析了应用磁流变(MR)阻尼器对相邻结构地震反应的控制效果,为进一步开展模型试验研究奠定了基础。建立了地震激励下相邻结构MR阻尼器控制系统的运动方程,提出了描述MR阻尼器阻尼力滞回特性的改进S igmoid模型,分别对应用开关控制、半主动控制以及最小或最大电流被动控制的四种控制方法的相邻结构地震反应的控制效果进行了仿真分析。结果表明,在相邻结构间连接安装MR阻尼器可以有效地控制相邻结构的地震反应,且开关控制方法和半主动控制方法的控制效果均好于两种被动控制方法,体现了MR阻尼器阻尼力可调的优点;在四种控制方法中,半主动控制方法的控制效果最好,体现了MR阻尼器阻尼力具有连续调节能力的优点;若能解决MR阻尼器的剩磁问题,半主动控制方法的控制效果会得到进一步的提高。

Simulation analysis of MR damper Control over seismic responses of adjacent structures

The control effect on seismic responses of adjacent structures using magnetorheological(MR) damper is simulated and analyzed,which lays a foundation for further model test investigation.The equations of motion of the system of the adjacent structures with MR damper control under earthquake excitations are established.A modified sigmoid model to describe the hysteresis behavior of the damping force of the MR damper is proposed.The control effects on seismic responses of the adjacent structures by employing four control strategies of the switch control,the semi-active control and the passive control with minimum or maximum current is simulated and investigated respectively.The results show that the seismic responses of the adjacent structures may be controlled effectively by installing the MR dampers between the adjacent structures,and the effects of the switch control and semi-active control strategies are better than those of passive control,which embodies the advantage of the damping force of the MR damper to be adjusted.The semi-active control strategy has best control effect in the four control strategies,which illustrates the merits of the damping force of the MR damper to be adjusted continuously.The control effect of the semi-active control strategy may be further enhanced if the problem of residual magnetism of the MR damper is solved.