大型复合材料空间刚架缩比模型设计方法

缩比模型试验是获取大型复合材料空间刚架力学特性或响应的一种有效途径,其中一项重要内容是缩比模型设计。以大型复合材料空间刚架为研究对象,阐述已有传统方法的局限性;基于离散相似提出结合有限元方法的方程分析法,利用该方法推导大型复合材料空间刚架静力学响应和动特性的相似关系;利用所提方法设计某复合材料龙骨的1/5缩比模型,并通过试验进行验证。验证结果表明,所提方法和推导的相似关系能够用于指导大型复合材料空间刚架的缩比模型试验。

智慧教室的技术架构设计及面临问题分析

在分析智慧教室内涵的基础上,从物联网、大数据、云计算等关键技术出发,重新设计智慧教室的技术架构,重点从感知层、网络层、服务层、应用层、终端层等几个层次进行阐述,并对智慧教室具体建设所面临的困难与挑战做了初步分析。

Preliminary Debris Mitigation Design Of LM-2C 2nd Stage Propulsion System

After satellite deployment, the second stage of a LM-2C launch vehicle performing a SSO mission has an orbital life of over 50 years. It is therefore necessary to vent the residual propellants in the 2nd stage to avoid debris-generating in-orbit explosion. Based on the characteristics of LM-2C, several concepts have been proposed. After detailed evaluation of these concepts, the method to drain the residual propellants through the main valves of the main engine has been selected.