一种自动优化的三角形有限元网格生成技术

提出了一种自动优化和三角形有限元网格生成方法，这种方法可以给出最佳的单元形态和节点分布方式，非常有利于提高有限元分析的精度和节约计算机内存及机时，该法已经应用于固体火箭发动机燃烧稳定性预估，并取得了良好的结果。由计算结果证明，该法正确，有效和实用。     

碳化硅在复合材料超塑变形中的作用

本对ＳｉＣｐ／ＭＲ６４复合材料的超塑性行了研究，在温度５１０℃，应变速率为８．．３３×１０＾－＾３Ｓ＾－＾１时延伸率达２１５％。ＳｉＣｐ对超塑形过程中的组织有很大影响，其中主要影响着晶粒长大和孔洞形核及长大。复合材料超塑性低的原因在于变形地平生大量孔洞。     

交互式电子技术手册——IETM综述

目前,IETM这一新兴技术已经得到军方及总部机关的认可,国内院校、研究院所也都对IETM有了深入的了解和认识,国内市场也有很多自主研发和引进的IETM平台。IETM推广的热潮已经兴起,相信在未来的1～3年内将会迎来IETM市场的高潮。     

Development of Landmark Knowledge at Decision Points

Two experiments investigated how people develop different landmark knowledge at decision points. Participants learned a route in a virtual city once or five times. One distinctive landmark was placed at each intersection of the route. At test, participants were released at each intersection according to the learning order and were required to determine the turning direction. At each intersection, the landmark was removed (no landmark), correctly placed (one landmark), duplicated on the other side (two identical landmarks), or misplaced from another intersection (two different landmarks) to disrupt the landmark sequence. The results suggested that humans develop different landmark knowledge (landmark knowledge for guidance, landmark knowledge for place recognition and knowledge of landmark sequence) with different navigation experience.     

航空航天用多功能SiC/Al复合材料研究进展(英文)

Multi-functional Al-matrix composites with high volume fraction （55%-57%） of SiC particles are produced with the new pressureless infiltration fabrication technology. X-ray detection and microscopic observation display the composites which are macroscopically homogeneous without porosity. The investigation further reveals that the SiC/Al composites possess low density （2.94 g/cm^3）, high elastic modulus （220 GPa）, prominent thermal management function as a result of low coefficient of thermal expansion （8 × 10^4 K^-1） and high thermal conductivity （235 W/（m.K）） as well as unique preventability of resonance vibration. By adopting a series of developed techniques, the multi-functional SiC/Al composites have managed to be made into near-net-shape parts. Many kinds of precision components of space-based optomechanical structures and airborne optoelectronic platform have been turned out. Of them, several typical products are being under test in practices.     

基于激光测量导向/定位方法的AGV系统

详述数字化制造系统中AGV运行控制的重要性;针对AGV系统传统的导向/定位方式及其存在的问题,提出一套基于激光测量方法的AGV导向/定位控制系统的设计方法;结合对AGV电池保障系统的改进,为AGV系统整体性能的全面提升提供了一种新的思路.     

导弹武器战场电磁环境构建及半实物仿真技术

简要分析了导弹武器面临的战场电磁环境特征,提出了一种通过数字+半实物相结合的仿真手段,在内场构建逼真的导弹武器战场动态电磁环境的基本方法。以导弹武器抗干扰性能半实物仿真试验为例,探讨了基于此电磁环境构建方法的半实物仿真系统组成及仿真试验流程。     

火箭摆杆模拟加载试验技术研究

针对火箭摆杆使用时的工作状态,分析模拟加载试验的难点,提出载荷的铺设、安装和试验改进方案,并设计出工艺装备。通过对摆杆、工艺装备等建模和有限元分析,实现了摆杆的模拟加载试验。对该项试验进行技术研究,保证了产品的质量和使用要求,并为今后大型摆杆的研制提供了实践使用依据和技术借鉴。     

高强度铝合金ZL205A支座铸造技术

对高强度铝合金ZL205A的熔炼工艺、热处理工艺进行了研究,并根据支座的结构特点和质量要求,制定了切实可行的铸造工艺方案,浇注了支座铸件。结果表明,ZL205A高强度铝合金铸件性能和质量满足设计指标要求,且可靠性与锻件基本相同,从而可代替锻件应用于支座,降低结构件制造成本,缩短制造周期。     

Proposal for a multiple-asteroid-flyby mission with sample return

Asteroid exploration provides a new approach to study the formation of the solar system and the planetary evolution. Choosing a suitable target and designing of feasible profile for asteroid mission are challenging due to constraints such as scientific value and technical feasibility. This paper investigates a feasible mission scenario among the potential candidates of multiple flybys and sample return missions. First, a group of potential candidates are selected by considering the physical properties and accessibility of asteroids, for the sample return missions. Second, the feasible mission scenarios for multiple flybys and sample return missions to various spectral-type asteroids are investigated. We present the optimized design of preliminary interplanetary transfer trajectory for two kinds of missions. One is the single sample return mission to asteroids with various spectral types. The other is the multiple flybys and sample return mission to several asteroids. In order to find the optimal profiles, the planetary swing-by technique and Differential Evolution algorithm are used.