大型射电望远镜舱索柔性结构涡激振动的数值模拟

Numerical simulation of vortex-excited oscillation for the long-span cable-cabin flexible structure of the large radio telescope

基于大幅度涡激共振发生的必要条件,找出了大型射电望远镜舱索柔性结构可能发生涡激共振的漩涡脱落频率锁住区域与相应的临界风速.在满足涡激共振必要条件的情况下,在时域中数值模拟了结构的涡激振动,给出了结构不会发生大幅度涡激共振的研究结论.模拟结论得到了模型实验的验证.

As a special wind-sensitive structure, the vortex-induced oscillation of the cable-cabin flexible structure of the largest radio telescope spanning 500 meters should be investigated. Utilizing the necessary conditions for structural vertex-excited resonance, the frequency lock-in area of vortex shedding and correspondent critical wind velocity are determined. Furthermore the structural vortex-excited oscillation is simulated numerically in time domain and the conclusion that the resonance will not occur is obtained. Also, the experiment of a scaled cable-cabin model spanning 50 meters is made to verify the conclusion.