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采用将电压切换时间作为可变参数的基于位移延时反馈的改进Bang-Bang控制算法,利用dSPACE、MATLAB/Simulink、MR阻尼器和电流放大器等工具,建立了拉索-MR阻尼器系统的半主动控制试验平台。利用该试验平台对拉索系统进行了半主动控制试验,研究了MR阻尼器的输入电压及切换时间等参数对拉索减振效果的影响。结果表明:对于拉索的前3阶模态振动,半主动控制时系统的等效模态阻尼比比相应的优化电压下的被动控制有不同程度的大幅提高;电压的切换时间显著地影响MR阻尼器对拉索的减振效果。
The improved Bang-Bang control algorithm based on the displacement delay feedback with voltage switching time as a variable parameter was used. The half-length of cable-MR damper system was established by using tools such as dSPACE, MATLAB / Simulink, MR damper and current amplifier Active control test platform. The semi-active control test of the cable system was carried out by using the test platform. The influence of the parameters such as input voltage and switching time of the MR damper on the cable vibration damping effect was studied. The results show that for the first three modes of the cable, the equivalent modal damping ratio of the semi-active control system is much higher than that of the passive control with the corresponding optimized voltage. The switching time of the voltage significantly affects the MR damping Vibration damping effect on the cable.