【摘要】 对不同控制策略下安装有复合MR(磁流变)阻尼器的模型结构进行了振动台试验研究。在El Centro地震动激励下,基于线性二次高斯(LQG)和广义预测(GP)两种控制算法,针对半主动控制系统、MR阻尼器以恒定电流(-0.5A(Passive-on 1)、0A(Passive-off)、2A(Passive-on 2)的控制系统,以及由半主动控制方式和基础隔震组合而成的混合控制系统,在WINCON/SIMULINK实时控制软件平台下对一个1:4的三层钢框架模型进行了地震模拟振动台试验。试验结果表明:基于复合MR阻尼器的控制系统是有效的,无论是被动控制、半主动控制还是混合控制,都显著降低了模型结构各层的加速度、位移响应;复合MR阻尼器在不通入电流时具有一定的被动控制效果;采用考虑时滞自补偿的广义预测控制效果要好于LQG控制,并且这两种控制策略的都能以较被动控制小的控制力达到较好的控制效果。更多还原

【Abstract】 Under the El Centro seismic input,the vibration control tests on three control systems,including semi-active control,control system with given electronic current and hybrid control,were carried out on the shaking table.The semi-active control system was based on the linear quadratic Gauss(LQG) and generalized predictive(GP) control.Definite electronic currents of three controls were-0.5A,0A,and 2A,respectively.The test results indicate that the control systems based on the composite MR damper are very effective.The passive control and the semi-active control are able to reduce the seismic responses of the structure significantly.The effect of the passive control system under 0A current demonstrates that the composite MR damper applied in the vibration control for civil engineering is more reliable,practical and economic than the conventional MR damper.Both the GP control and the LQG algorithms achieve a better control effect with less control forces compared with the passive control.更多还原