为实现五百米口径球面射电望远镜(Five-hundred meter Aperture Spherical radio Telescope,FAST)馈源支撑系统馈源终端的高精度轨迹跟踪及防止馈源支撑索力超限,研究了馈源支撑系统星形框架和AB轴机构对目标终端位姿的分配算法。首先,...为实现五百米口径球面射电望远镜(Five-hundred meter Aperture Spherical radio Telescope,FAST)馈源支撑系统馈源终端的高精度轨迹跟踪及防止馈源支撑索力超限,研究了馈源支撑系统星形框架和AB轴机构对目标终端位姿的分配算法。首先,根据馈源支撑系统机构特征,综合馈源舱的重心时变及其采用的回照策略,建立了带有馈源舱回照策略的考虑馈源舱重心时变的悬索牵引并联系统力学模型。然后,为解决AB轴机构与星形框架间的运动耦合问题,设计了两种馈源支撑系统位姿分配算法:优先保障六索索力均衡的位姿分配算法和优先保障馈源接收终端定位精度的位姿分配算法。最后,通过仿真对两种算法在馈源终端定位精度和索力分布情况两个方面的性能进行分析。仿真结果表明:前一算法能使六索索力分配均匀,但是引入了最大1.2°的馈源接收终端指向误差,已超出工程指向精度范围。后一算法的六索索力波动较大,但索力没超限或虚牵,能保证馈源接收终端的位姿,此算法满足工程需求。展开更多
The brittleness analysis and important nodes detection have been a hot spot in the complex networks.How to get the overall feature of the whole network and how to find out some important nodes are requisites to solve ...The brittleness analysis and important nodes detection have been a hot spot in the complex networks.How to get the overall feature of the whole network and how to find out some important nodes are requisites to solve these problems. In this paper, we adopt the trace of the adjacency matrix and the centrality of the complex networks to give a quantitative and qualitative analysis of networks being studied. Results show that the k-shell plays a more important role than the degree centrality and the betweenness in finding important nodes, and it can also be used to give direction on the immunization and maintenance of complex networks.展开更多
文摘为实现五百米口径球面射电望远镜(Five-hundred meter Aperture Spherical radio Telescope,FAST)馈源支撑系统馈源终端的高精度轨迹跟踪及防止馈源支撑索力超限,研究了馈源支撑系统星形框架和AB轴机构对目标终端位姿的分配算法。首先,根据馈源支撑系统机构特征,综合馈源舱的重心时变及其采用的回照策略,建立了带有馈源舱回照策略的考虑馈源舱重心时变的悬索牵引并联系统力学模型。然后,为解决AB轴机构与星形框架间的运动耦合问题,设计了两种馈源支撑系统位姿分配算法:优先保障六索索力均衡的位姿分配算法和优先保障馈源接收终端定位精度的位姿分配算法。最后,通过仿真对两种算法在馈源终端定位精度和索力分布情况两个方面的性能进行分析。仿真结果表明:前一算法能使六索索力分配均匀,但是引入了最大1.2°的馈源接收终端指向误差,已超出工程指向精度范围。后一算法的六索索力波动较大,但索力没超限或虚牵,能保证馈源接收终端的位姿,此算法满足工程需求。
文摘The brittleness analysis and important nodes detection have been a hot spot in the complex networks.How to get the overall feature of the whole network and how to find out some important nodes are requisites to solve these problems. In this paper, we adopt the trace of the adjacency matrix and the centrality of the complex networks to give a quantitative and qualitative analysis of networks being studied. Results show that the k-shell plays a more important role than the degree centrality and the betweenness in finding important nodes, and it can also be used to give direction on the immunization and maintenance of complex networks.
