MRE耗能阻尼器力学性能及半主动控制分析

Study on Mechanical Properties of Energy⁃Dissipating Damper Based on MRE and Semi⁃active Control Analysis

根据磁流变弹性体(magnetorheological elastomer,简称MRE)的可调力学特性提出了基于MRE的新型耗能阻尼器,并对制备完成的硅橡胶基磁流变弹性体及阻尼器分别进行力学性能试验。利用Matlab/Simulink对各层均装有MRE阻尼器的7层框架结构进行建模仿真分析,将被动控制与基于半主动控制策略的经典最优控制和序列最优控制进行比较。力学测试结果表明:MRE在0~500 mT磁感应强度下其剪切模量变化值达到132.43 kPa,磁流变效应约提高274%;增大加载幅值和加载速率,均能提高MRE阻尼器的力学性能;对阻尼器施加电流激励,在0~10 A增大过程中其等效刚度和阻尼可以实现连续可调。仿真结果表明:基于MRE阻尼器的半主动控制系统可以有效减小结构在地震作用下的响应,3种控制均能对结构动力响应起到良好的控制效果,其中序列最优控制算法的控制效果最为显著且精确度更高;系统在实际测试中需考虑多方面因素影响,尽可能减小误差。

A new type of energy dissipation damper based on MRE is proposed according to the adjustable mechanical properties of magnetorheological elastomer(MRE)..The seven-story frame structure with MRE damper on each floor is modeled and simulated by Matlab/Simulink,and the passive control is compared with the classical linear optimal control and sequential optimal control based on semi-active control strategy.The mechanical test results show that under the action of 0~500 mT magnetic induction intensity,the change of shear modulus of MRE reaches 132.43 kPa,and the magnetorheological effect is increased by approximately 274%.The increase of loading amplitude and loading rate can improve the mechanical properties of MRE damper,and the equivalent stiffness and damping of the damper can be continuously adjusted during the increase of current excitation from 0 to 10 A.The simulation results show that the semi-active control system based on the MRE damper can effectively reduce the response of the structure under seismic action,and all three methods can control the dynamic response.Among them,the sequential optimal control algorithm has the most significant control effect and higher accuracy.In addition,the system needs to consider the influence of various factors in the actual test to minimize the error.