MR智能阻尼器对空间网壳结构的风振抑制分析

磁流变液（MR）智能阻尼器是一种新型智能材料减振装置,可用于空间网壳结构的风振抑制。以适当方式和空间网壳结构结合即形成智能材料杆件空间网壳结构。建立了智能材料杆件有限元模型,研究了磁流变阻尼器布置方式和控制策略对空间网壳结构抗风减振的影响。将MR阻尼器设置于网壳结构径向肋杆处优于设在结构环向杆件处。不同控制策略导致不同的风振控制效果。Passive—off控制策略的风振抑制效果较差;Passive-on策略对控制结构的位移响应效果较好,而对控制结构的速度响应和加速度响应效果不佳。半主动控制策略对控制结构的位移响应、速度响应和加谏序响府均掂瑚相．针对不同风荷载作用,采用相同阻尼器布置方案和控制策略,结构风振控制效果大致相同。

The Wind-induced Vibration Control of Spatial Reticulated Shell Structures with MR Dampers

MR(Magneto-rheological)damper is a kind of smart material device and suitable for structural vibration control.The combination of spatial reticulated shell structures(SRSS) with MR dampers can reduce structural wind-induced vibration.The mechanical model of an element with MR damper is given,the influence on structural wind-induced vibration reduction caused by distribution of MR dampers and control strategies ard studied.The numerical results show that the arrangement of fixing MR dampers on the members along the radial direction of SRSS brings better vibration control effect than along the circular direction of SRSS.Different control strategies exert different influence on the wind-induced vibration reduction of SRSS.The"passive-off"strategy has lower control effect.The"passive-on"strategy brings better control effect for the structural displacement responses,but supplies lower control effect for the structural velocity and acceleration responses.The semi-active control strategy is an ideal vibration control approach to reduce structural displacement,velocity and acceleration responses.If there exist different kinds of wind load,the investigation shows that almost the same wind-induced vibration control effect on SRSS comes about if the same distribution of MR dampers and the same control strategy are adopted.