LT50m缩比模型悬索舱体系统的风振分析

Wind Induced Vibration Analysis of a 50 Meter Scaled Model of Large Radio Telescope

在新一代大型射电望远镜 (LT)的悬索舱体系统中增加了抑制风激振动的下拉结构控制索系 ,并分析了 5 0m缩比模型的风振响应。首先 ,由非线性静力分析确定结构初始静态参考位形和初应力 ;其次 ,针对结构特点模拟作用在悬索和馈源舱上的随机风荷。在上述研究的基础上 ,在时域中模拟分析下拉索系对结构风振的抑制效果 ,同时通过典型节点时域响应的FFT变换 ,绘出响应自功率谱图 。

A downward cable system for structural control is desi gn to control wind-induced vibration for the next generation large radio telesco pe. The wind induced vibration of a 50 meter scaled model of the telescope is an alyzed. Initial static reference posture and initial stresses are determined by nonlinear static analysis. Random wind forces acted on the cables, and the cabin are simulated based on the characters of the structure. Then the control effect of the downward cable system to structural vibration is analyzed in time region . Meanwhile the frequency response figure of a special node of the cabin is dra wn through FFT transformation, which describes the control effect further.