空间网格结构风振控制中的MR阻尼器数量和位置寻优

采用改进遗传算法(Genetic Algorithms,GA)研究空间网格结构风振抑制的MR阻尼器位置和数量的优化布置.构建了适用于空间网格结构的MR阻尼器位置和数量同步优化计算的适应度函数,明显提高了寻优计算速度和精度.利用谐波叠加法模拟计算模型的表面节点风速时程,并转化为节点风载序列.通过数值算例,对典型空间网壳结构的阻尼器空间位置和数量进行优化计算;采用寻优后的阻尼杆件位置和数量布置,分析结构的风振响应.最后,给出MR阻尼器位置和数量寻优的结论.

Proper placement and reasonable quantity of MR dampers for reduction of wind induced vibration in spatial reticulated structures

Ameliorated strategy is put forward to improve the classical Genetic Algorithm (GA) in finding proper placement and reasonable quantity of MR dampers for reducing wind induced vibration of spatial reticulated structures. The improvements including constructing fitness function, which can meet requirement of finding the proper placement and appropriate quantity simultaneously, are able to advance the searching speed and precision of GA. In addition, the parameter investigation was carried out, which affects the reduction of structural wind-induced vibration. Based on harmony superposition technique, the wind velocity time history on the nodes of spatial reticulated structure was simulated and translated as series of wind loads. Finally, by enumerating the spatial shell structures as examples and analyzing the results of numerical calculation through ameliorated GA method, some conclusions on optimizing the placement and quantity of MR dampers in spatial reticulated structure were reached under wind loads.