当航天飞机在肯尼迪空间中心的操作趋于成熟之际,对于下一代空间运输系统的一些方案,许多合同商正在进行研究。在洛克威尔空间运输系统分部进行的研究得出了如下结论:要使当代航天飞机使用经济性有重大改进,需要先进的技术。最重要的,也许是最困难的研制技术是高强度、刚度-重 While space shuttle operations in the Kennedy Space Center are becoming more mature, many contractors are researching some of the options for the next generation of space transportation systems. The study conducted at the Rockwell Space Transport System Division concluded that advanced technologies are needed to make significant improvements in the economics of contemporary space shuttles. The most important, perhaps the most difficult development technique is high strength, stiffness - heavy