排序方式: 共有36条查询结果,搜索用时 15 毫秒
31.
为满足航天系统的全天候发射任务需求,加强航天系统对于雷电环境的适应性,对航天系统雷电防护技术的发展情况进行了综述。首先分析雷电环境对于航天系统产生的破坏效应,追踪了世界航天史上典型的雷击案例,系统梳理了国内外航天系统雷电防护标准规范。针对运载火箭雷电效应数值仿真技术、雷电防护设计技术和试验验证技术,雷电气象监测预警技术,地面雷电防护技术和接地技术等关键技术的发展情况进行了追踪。在此基础上,从我国航天工程雷电防护的实际需求出发,对未来我国航天系统雷电防护技术重点研究方向进行了展望。 相似文献
32.
33.
造氧系统使用水为空间站上的航天员制造可呼吸的氧气。这对于探测月球、火星及以远星球的长期任务而言是必不可少的。该系统已于2006年1月24日运往肯尼迪航天中心,准备于7月搭乘发现号航天飞机升空。空间站项目经理表示,运送这一硬件是完善空间站的一个重要步骤,一旦安装完毕,这个再生式生命支持系统就可以为空间站上更多的航天员提供氧气,使其进行更多科学研究。 相似文献
34.
35.
Rational planning of spares configuration project is an effective approach to improve equipment availability as well as reduce life cycle cost (LCC). With an analysis of various impacts on support system, the spares demand rate forecast model is constructed. According to systemic analysis method, spares support effectiveness evaluation indicators system is built, and then, initial spares configuration and optimization method is researched. To the issue of discarding and con-sumption for incomplete repairable items, its expected backorders function is approximated by Laplace demand distribution. Combining the (s-1, s) and (R, Q) inventory policy, the spares resup-ply model is established under the batch ordering policy based on inventory state, and the optimi-zation analysis flow for spares configuration is proposed. Through application on shipborne equipment spares configuration, the given scenarios are analyzed under two constraint targets:one is the support effectiveness, and the other is the spares cost. Analysis reveals that the result is consistent with practical regulation;therefore, the model's correctness, method's validity as well as optimization project's rationality are proved to a certain extent. 相似文献