关键词: 大型射电望远镜, 刚度矩阵, 悬索舱体结构, 边界元法, 插入损失, 高速铁路, 声屏障, 声源模型

Abstract: Considering the special structure for the large radio telescope (LT) with large span flexible cable, the stationary stiffness of the cable-suspended-feed system is studied. The nonlinear equilibrium of the cable-cabin system first is derived with respect to the moving cabin’s position variables. The stationary stiffness formulation is obtained based on geometrical nonlinear between the stiffness and tension of cable. Then the formulation is applied to analyses vibration of the cabin. A comparison simulation and practical experiment results of LT 50 m model show the validity of the formulation. Additional, the relation of the cable tension and stiffness of the feed system for LT 50 m model is obtained .

Key words: Large radio telescope, Suspended feed structure Stiffness matrix, Boundary element method, Insertion loss, Noise barrier, Sound source model, High-speed railway