500m口径球面射电望远镜进舱缆线连接机构的设计及其静力学分析

Design of Linking Mechanisms of Cable into Focus Cabin of Five-hundred-meters Aperture Spherical Radio Telescope and Its Static Analysis

由于500 m口径球面射电望远镜(Five-hundred-meters aperture spherical radio telescope,FAST)的馈源舱与地面之间是柔性连接,其包含动力电缆和信号光缆在内的缆线进舱连接机构的设计较为困难。针对FAST馈源舱是由悬索支撑的特殊结构形式,对3种可能的缆线进舱连接机构的设计方案进行分析比较,并从静力学角度分析悬架于支撑索上的缆线质量对于支撑索张力和舱倾斜角所造成的不利影响。为求解舱-索系统的静力学和工作空间优化问题,从3种设计方案中选择进舱连接通道的支撑索悬链线方程进行分析和求解,建立悬链线参数与舱体静力平衡方程的关系。计算结果表明,3种缆线进舱连接机构的设计方案的不利影响均较小,从力学角度均具备可行性条件。

Because the supporting structure that keeps the focus cabin of five-hundred-meters aperture spherical telescope （FAST） airborne is highly flexible, it is difficult for the design of the linking mechanisms which hold power supply cable or optical fiber cable for signal transmission into the focus cabin. Three design candidates are put forward and compared, where one or several steel ropes are used as the supporting channel. Static analysis is especially investigated upon the adverse effects on the tension forces of the steel ropes and the natural tilt of the cabin because of the additional weight of suspended cables. To solve the static equilibrium and the workspace optimization of the cabin-cable System, different catenaries of the steel ropes respectively used as the supporting channel in three design candidates are deduced, which connect the catenary parameter with the equilibrium equations. The calculations prove that the adverse effects are relatively small for all designs; therefore they all are feasible from the viewpoint of mechanics.