基于磁流变弹性体的平台竖向隔振研究  

Study on vertical vibration isolation of platform based on magnetorheological elastomer

作　　者：索思 徐赵东[1] 朱俊涛[2] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]郑州大学土木工程学院,河南郑州450001

出　　处：《地震工程与工程振动》2015年第5期61-67,共7页Earthquake Engineering and Engineering Dynamics

基　　金：江苏省杰出青年科学基金项目(BK20140025);国家"973"项目

摘　　要：磁流变弹性体(MRE)由于其力学性能稳定且有显著的磁流变效应,在平台结构智能隔振控制方面具有广阔的应用前景。本文首先通过动态试验研究了溴化丁基橡胶基磁流变弹性体(BIIR_MRE)的力学性能,该材料具有良好的耗能能力和磁致变刚度特性;然后根据试验结果及平台参数设计了一种采用MRE材料的隔振支座,并以平台竖向加速度为控制量设计了相应的PID控制系统;最后在Simulink中建立仿真模型验证了隔振支座的隔振效果。仿真结果表明:该隔振控制系统可以有效地降低平台的竖向加速度、速度和位移响应;控制力饱和可能造成加速度和速度响应的跳跃,故控制力是限制PID控制系统隔振效果的主要因素;提高MRE的磁流变效应,可以进一步改善PID控制效果。Magnetorheological elastomer （MRE） has wide application prospects in smart vibration isolation of the platform structure due to its stability and significant MR effects. In this paper, the mechanical properties of MRE based on bromobutyl rubber （BIIR_MRE） are studied by dynamic experiments, which indicate that BIIR_MRE has high damping capacity and magnetic induced stiffness variability. According to the experimental results and main parameters of the platform structure, a new smart isolation bearing is developed and the corresponding PID control system is designed with the vertical acceleration of the platform as the controlling quantity. And then, a simulation of this system is conducted in Simulink, the results of which suggest that the developed isolation system can effectively reduce the responses of the platform structure, including acceleration, velocity and displacement. The saturation of control force can limit the effect of vibration isolation, resulting in the fluctuation of acceleration and velocity responses, and so improving the MR effect of MRE is a valid way of enhancing the isolation effect of this control system.

关 键 词：磁流变弹性体 力学性能试验 平台结构 隔振支座 PID控制系统 

分 类 号：TU352.1[建筑科学—结构工程] TU317