MR阻尼器在空间网壳结构风振抑制中的控制策略影响规律研究

Study of impact of control strategies on the wind-induced vibration reduction of spatial reticulated shell structures with MR dampers introduced

磁流变液(MR)阻尼器是一种新型智能材料抗风减振装置,它以适当方式和网壳结构结合,形成具有智能材料杆件的空间网壳结构,以达到抑制结构风振的目的。本文研究了控制策略对空间网壳结构的抗风减振效果的影响。研究表明,不同控制策略导致不同的减振效果。Passive-off控制策略的风振抑制效果较差,Passive-on控制策略对控制结构位移响应效果较好,但对控制速度和加速度效果不佳。半主动控制策略对控制结构的位移、速度和加速度响应均较理想。

MR （Magneto-rheological） damper is a smart material control device for structural vibration. The combination of spatial reticulated shell structures（SRSS） with MR dampers can reduce structural wind-induced vibration. The influence on structural wind- induced vibration reduction caused by control strategies are studied. The results show that, for the numerical examples, different control strategies have different effect on the wind-induced vibration reduction of SRSS. The “Passive-off” strategy has lower control effect. The “Passive-on” strategy brings better structural displacement reduction effect, but supplies lower velocity and acceleration control effect. The semi-active control strategy is an ideal vibration control approach to reduce displacement, velocity and acceleration responses of SRSS.